nih-gov/www.ncbi.nlm.nih.gov/omim/109092

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- *109092 - TRIPARTITE MOTIF-CONTAINING PROTEIN 21; TRIM21
- OMIM
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<span class="h4">*109092</span>
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<strong>Table of Contents</strong>
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<a href="#cloning">Cloning and Expression</a>
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<a href="#geneFunction">Gene Function</a>
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<a href="#biochemicalFeatures">Biochemical Features</a>
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<a href="#geneStructure">Gene Structure</a>
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<a href="#mapping">Mapping</a>
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<a href="#molecularGenetics">Molecular Genetics</a>
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<div><a href="https://hprd.org/summary?hprd_id=00170&isoform_id=00170_1&isoform_name=Isoform_1" class="mim-tip-hint" title="The Human Protein Reference Database; manually extracted and visually depicted information on human proteins." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'HPRD', 'domain': 'hprd.org'})">HPRD</a></div>
<div><a href="https://www.proteinatlas.org/search/TRIM21" class="mim-tip-hint" title="The Human Protein Atlas contains information for a large majority of all human protein-coding genes regarding the expression and localization of the corresponding proteins based on both RNA and protein data." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'HumanProteinAtlas', 'domain': 'proteinatlas.org'})">Human Protein Atlas</a></div>
<div><a href="https://www.ncbi.nlm.nih.gov/protein/133250,337485,338490,665918,747927,14790039,14994115,15208660,53690156,119589251,218471934" class="mim-tip-hint" title="NCBI protein data." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'NCBI Protein', 'domain': 'ncbi.nlm.nih.gov'})">NCBI Protein</a></div>
<div><a href="https://www.uniprot.org/uniprotkb/P19474" class="mim-tip-hint" title="Comprehensive protein sequence and functional information, including supporting data." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'UniProt', 'domain': 'uniprot.org'})">UniProt</a></div>
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<div><a href="http://biogps.org/#goto=genereport&id=6737" class="mim-tip-hint" title="The Gene Portal Hub; customizable portal of gene and protein function information." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'BioGPS', 'domain': 'biogps.org'})">BioGPS</a></div>
<div><a href="https://www.ensembl.org/Homo_sapiens/Gene/Summary?db=core;g=ENSG00000132109;t=ENST00000254436" class="mim-tip-hint" title="Orthologs, paralogs, regulatory regions, and splice variants." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Ensembl', 'domain': 'ensembl.org'})">Ensembl</a></div>
<div><a href="https://www.genecards.org/cgi-bin/carddisp.pl?gene=TRIM21" class="mim-tip-hint" title="The Human Genome Compendium; web-based cards integrating automatically mined information on human genes." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'GeneCards', 'domain': 'genecards.org'})">GeneCards</a></div>
<div><a href="http://amigo.geneontology.org/amigo/search/annotation?q=TRIM21" class="mim-tip-hint" title="Terms, defined using controlled vocabulary, representing gene product properties (biologic process, cellular component, molecular function) across species." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'GeneOntology', 'domain': 'amigo.geneontology.org'})">Gene Ontology</a></div>
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<dd><a href="http://v1.marrvel.org/search/gene/TRIM21" class="mim-tip-hint" title="Model organism Aggregated Resources for Rare Variant ExpLoration." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'MARRVEL', 'domain': 'marrvel.org'})">MARRVEL</a></dd>
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<div><a href="https://genome.ucsc.edu/cgi-bin/hgGene?db=hg38&hgg_chrom=chr11&hgg_gene=ENST00000254436.8&hgg_start=4384897&hgg_end=4393702&hgg_type=knownGene" class="mim-tip-hint" title="UCSC Genome Bioinformatics; gene-specific structure and function information with links to other databases." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'UCSC', 'domain': 'genome.ucsc.edu'})">UCSC</a></div>
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<div><a href="https://evs.gs.washington.edu/EVS/PopStatsServlet?searchBy=Gene+Hugo&target=TRIM21&upstreamSize=0&downstreamSize=0&x=0&y=0" class="mim-tip-hint" title="National Heart, Lung, and Blood Institute Exome Variant Server." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'NHLBI EVS', 'domain': 'evs.gs.washington.edu'})">NHLBI EVS</a></div>
<div><a href="https://www.pharmgkb.org/gene/PA36136" class="mim-tip-hint" title="Pharmacogenomics Knowledge Base; curated and annotated information regarding the effects of human genetic variations on drug response." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PharmGKB', 'domain': 'pharmgkb.org'})">PharmGKB</a></div>
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<div><a href="https://www.alliancegenome.org/gene/HGNC:11312" class="mim-tip-hint" title="Search Across Species; explore model organism and human comparative genomics." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Alliance Genome', 'domain': 'alliancegenome.org'})">Alliance Genome</a></div>
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<div style="margin-left: 0.5em;"><a href="https://wormbase.org/db/gene/gene?name=WBGene00015114;class=Gene" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Wormbase Gene', 'domain': 'wormbase.org'})">WBGene00015114&nbsp;</a></div><div style="margin-left: 0.5em;"><a href="https://wormbase.org/db/gene/gene?name=WBGene00016190;class=Gene" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Wormbase Gene', 'domain': 'wormbase.org'})">WBGene00016190&nbsp;</a></div><div style="margin-left: 0.5em;"><a href="https://wormbase.org/db/gene/gene?name=WBGene00016191;class=Gene" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Wormbase Gene', 'domain': 'wormbase.org'})">WBGene00016191&nbsp;</a></div><div style="margin-left: 0.5em;"><a href="https://wormbase.org/db/gene/gene?name=WBGene00018384;class=Gene" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Wormbase Gene', 'domain': 'wormbase.org'})">WBGene00018384&nbsp;</a></div><div style="margin-left: 0.5em;"><a href="https://wormbase.org/db/gene/gene?name=WBGene00022868;class=Gene" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Wormbase Gene', 'domain': 'wormbase.org'})">WBGene00022868&nbsp;</a></div><div style="margin-left: 0.5em;"><a href="https://wormbase.org/db/gene/gene?name=WBGene00022870;class=Gene" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Wormbase Gene', 'domain': 'wormbase.org'})">WBGene00022870&nbsp;</a></div><div style="margin-left: 0.5em;"><a href="https://wormbase.org/db/gene/gene?name=WBGene00022872;class=Gene" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'Wormbase Gene', 'domain': 'wormbase.org'})">WBGene00022872&nbsp;</a></div>
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<span class="mim-tip-bottom" qtip_title="<strong>Looking for this gene or this phenotype in other resources?</strong>" qtip_text="Select a related resource from the dropdown menu and click for a targeted link to information directly relevant.">
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<a id="title" class="mim-anchor"></a>
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<a id="number" class="mim-anchor"></a>
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&nbsp;
</div>
<div>
<span class="h3">
<span class="mim-font mim-tip-hint" title="Gene description">
<span class="text-danger"><strong>*</strong></span>
109092
</span>
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</div>
<div>
<a id="preferredTitle" class="mim-anchor"></a>
<h3>
<span class="mim-font">
TRIPARTITE MOTIF-CONTAINING PROTEIN 21; TRIM21
</span>
</h3>
</div>
<div>
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</div>
<div>
<a id="alternativeTitles" class="mim-anchor"></a>
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<p>
<span class="mim-font">
<em>Alternative titles; symbols</em>
</span>
</p>
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<div>
<h4>
<span class="mim-font">
SJOGREN SYNDROME ANTIGEN A1; SSA1<br />
SICCA SYNDROME ANTIGEN A; SSA<br />
AUTOANTIGEN Ro/SSA, 52-KD; RO52
</span>
</h4>
</div>
</div>
<div>
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</div>
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<a id="approvedGeneSymbols" class="mim-anchor"></a>
<p>
<span class="mim-text-font">
<strong><em>HGNC Approved Gene Symbol: <a href="https://www.genenames.org/tools/search/#!/genes?query=TRIM21" class="mim-tip-hint" title="HUGO Gene Nomenclature Committee." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'HGNC', 'domain': 'genenames.org'})">TRIM21</a></em></strong>
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<a id="cytogeneticLocation" class="mim-anchor"></a>
<p>
<span class="mim-text-font">
<strong>
<em>
Cytogenetic location: <a href="/geneMap/11/105?start=-3&limit=10&highlight=105">11p15.4</a>
&nbsp;
Genomic coordinates <span class="small">(GRCh38)</span> : <a href="https://genome.ucsc.edu/cgi-bin/hgTracks?db=hg38&position=chr11:4384897-4393702&dgv=pack&knownGene=pack&omimGene=pack" class="mim-tip-hint" title="UCSC Genome Browser; reference sequences and working draft assemblies for a large collection of genomes." target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'UCSC Genome Browser', 'domain': 'genome.ucsc.edu'})">11:4,384,897-4,393,702</a> </span>
</em>
</strong>
<a href="https://www.ncbi.nlm.nih.gov/" target="_blank" class="small"> (from NCBI) </a>
</span>
</p>
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<a id="text" class="mim-anchor"></a>
<h4>
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<span class="mim-tip-floating" qtip_title="<strong>Looking For More References?</strong>" qtip_text="Click the 'reference plus' icon &lt;span class='glyphicon glyphicon-plus-sign'&gt;&lt;/span&gt at the end of each OMIM text paragraph to see more references related to the content of the preceding paragraph.">
<strong>TEXT</strong>
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</h4>
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<a id="description" class="mim-anchor"></a>
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<span id="mimDescriptionToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
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<strong>Description</strong>
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<p>TRIM21 is an E3 ubiquitin ligase that controls responses to TLR2 agonists (<a href="#6" class="mim-tip-reference" title="Sjostrand, M., Carow, B., Nyberg, W. A., Covacu, R., Rottenberg, M. E., Espinosa, A. &lt;strong&gt;TRIM21 controls Toll-like receptor 2 responses in bone-marrow-derived macrophages.&lt;/strong&gt; Immunology 159: 335-343, 2019.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/31755557/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;31755557&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=31755557[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1111/imm.13157&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="31755557">Sjostrand et al., 2019</a>). <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=31755557" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<h4 href="#mimCloningFold" id="mimCloningToggle" class="mimTriangleToggle" style="cursor: pointer;" data-toggle="collapse">
<span id="mimCloningToggleTriangle" class="small mimTextToggleTriangle">&#9660;</span>
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<strong>Cloning and Expression</strong>
</span>
</h4>
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<span class="mim-text-font">
<p>Ro/SSA is a ribonucleoprotein particle composed of a single polypeptide and 1 of 4 small RNA molecules. Autoantibodies to Ro/SSA are present in 30 to 50% of patients with systemic lupus erythematosus (SLE; <a href="/entry/152700">152700</a>) and in at least half of patients with primary Sjogren syndrome (<a href="/entry/270150">270150</a>). At least 2 distinct Ro/SSA polypeptides exist, a 60-kD form (TROVE2; <a href="/entry/600063">600063</a>) and a 52-kD form. Using serum from a lupus patient to screen a human thymocyte cDNA expression library, <a href="#3" class="mim-tip-reference" title="Itoh, K., Itoh, Y., Frank, M. B. &lt;strong&gt;Protein heterogeneity in the human Ro/SSA ribonucleoproteins: the 52- and 60-kD Ro/SSA autoantigens are encoded by separate genes.&lt;/strong&gt; J. Clin. Invest. 87: 177-186, 1991.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/1985094/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;1985094&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1172/JCI114968&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="1985094">Itoh et al. (1991)</a> cloned TRIM21, which encodes the 52-kD Ro/SSA antigen. The deduced 475-amino acid protein has a calculated molecular mass of 54.1 kD. It has multiple N-terminal zinc finger motifs, a central leucine zipper, and a potential N-glycosylation site. Predicted hydrophobic regions are located at the N terminus, in the center of the molecule, and at the C terminus. Western blot analysis of lymphocyte extracts using patient serum confirmed that TRIM21 had an apparent molecular mass of 52 kD. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=1985094" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#4" class="mim-tip-reference" title="James, L. C., Keeble, A. H., Khan, Z., Rhodes, D. A., Trowsdale, J. &lt;strong&gt;Structural basis for PRYSPRY-mediated tripartite motif (TRIM) protein function.&lt;/strong&gt; Proc. Nat. Acad. Sci. 104: 6200-6205, 2007.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17400754/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;17400754&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=17400754[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1073/pnas.0609174104&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="17400754">James et al. (2007)</a> stated that the human TRIM21 protein contains an N-terminal RING finger that has E3 ligase activity, followed by a B box, 2 coiled-coil regions, and a long C-terminal PRYSPRY domain that binds IgG (see <a href="/entry/147100">147100</a>) Fc fragments. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17400754" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Using an EGFP reporter inserted into the Trim21 locus, <a href="#6" class="mim-tip-reference" title="Sjostrand, M., Carow, B., Nyberg, W. A., Covacu, R., Rottenberg, M. E., Espinosa, A. &lt;strong&gt;TRIM21 controls Toll-like receptor 2 responses in bone-marrow-derived macrophages.&lt;/strong&gt; Immunology 159: 335-343, 2019.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/31755557/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;31755557&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=31755557[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1111/imm.13157&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="31755557">Sjostrand et al. (2019)</a> showed that Trim21 was expressed in macrophages and dendritic cells of mice. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=31755557" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<strong>Gene Function</strong>
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<p><a href="#2" class="mim-tip-reference" title="Frank, M. B. &lt;strong&gt;Characterization of DNA binding properties and sequence specificity of the human 52 kDa Ro/SS-A (Ro52) zinc finger protein.&lt;/strong&gt; Biochem. Biophys. Res. Commun. 259: 665-670, 1999.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/10364476/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;10364476&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1006/bbrc.1999.0835&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="10364476">Frank (1999)</a> found that human RO52 expressed in insect cells bound double-stranded but not single-stranded DNA, and that zinc was required for binding. Sequencing oligonucleotides bound by RO52 revealed a purine-rich consensus motif, ARGRGGG(G/C)(A/C)GRNGA, in which R represents a purine and N indicates no consensus. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10364476" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p>Using microarray analysis, <a href="#6" class="mim-tip-reference" title="Sjostrand, M., Carow, B., Nyberg, W. A., Covacu, R., Rottenberg, M. E., Espinosa, A. &lt;strong&gt;TRIM21 controls Toll-like receptor 2 responses in bone-marrow-derived macrophages.&lt;/strong&gt; Immunology 159: 335-343, 2019.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/31755557/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;31755557&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=31755557[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1111/imm.13157&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="31755557">Sjostrand et al. (2019)</a> showed that maturation of bone marrow-derived macrophages (BMDMs) from Trim21 -/- mice was reduced in response to macrophage colony-stimulating factor (MCSF, or CSF2; <a href="/entry/120420">120420</a>). Trim21 -/- BMDMs became hyporesponsive to stimulation with the TLR2 ligand PAM3CSK4, indicating that Trim21 was necessary for optimal responses to TLR2 agonists. Trim21 -/- BMDMs also became hyporesponsive to stimulation with Mycobacterium bovis Bacillus Calmette-Guerin (BCG), suggesting that Trim21 was also necessary for full responses to more complex stimuli. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=31755557" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p><p><a href="#5" class="mim-tip-reference" title="Park, J. S., Burckhardt, C. J., Lazcano, R., Solis, L. M., Isogai, T., Li, L., Chen, C. S., Gao, B., Minna, J. D., Bachoo, R., DeBerardinis, R. J., Danuser, G. &lt;strong&gt;Mechanical regulation of glycolysis via cytoskeleton architecture.&lt;/strong&gt; Nature 578: 621-626, 2020.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/32051585/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;32051585&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=32051585[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/s41586-020-1998-1&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="32051585">Park et al. (2020)</a> reported that the transfer of human bronchial epithelial cells from stiff to soft substrates caused a downregulation of glycolysis via proteasomal degradation of the rate-limiting metabolic enzyme phosphofructokinase (PFK; see PFKP, <a href="/entry/171840">171840</a>). PFK degradation was triggered by the disassembly of stress fibers, which released the PFK-targeting E3 ubiquitin ligase TRIM21. Transformed non-small-cell lung cancer cells, which maintain high glycolytic rates regardless of changing environmental mechanics, retained PFK expression by downregulating TRIM21, and by sequestering residual TRIM21 on a stress fiber subset that is insensitive to substrate stiffness. <a href="#5" class="mim-tip-reference" title="Park, J. S., Burckhardt, C. J., Lazcano, R., Solis, L. M., Isogai, T., Li, L., Chen, C. S., Gao, B., Minna, J. D., Bachoo, R., DeBerardinis, R. J., Danuser, G. &lt;strong&gt;Mechanical regulation of glycolysis via cytoskeleton architecture.&lt;/strong&gt; Nature 578: 621-626, 2020.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/32051585/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;32051585&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=32051585[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1038/s41586-020-1998-1&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="32051585">Park et al. (2020)</a> concluded that their data revealed a mechanism by which glycolysis responds to architectural features of the actomyosin cytoskeleton, thus coupling cell metabolism to the mechanical properties of the surrounding tissue. These processes enable normal cells to tune energy production in variable microenvironments, whereas the resistance of the cytoskeleton in response to mechanical cues enables the persistence of high glycolytic rates in cancer cells despite constant alterations of the tumor tissue. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=32051585" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p><a href="#4" class="mim-tip-reference" title="James, L. C., Keeble, A. H., Khan, Z., Rhodes, D. A., Trowsdale, J. &lt;strong&gt;Structural basis for PRYSPRY-mediated tripartite motif (TRIM) protein function.&lt;/strong&gt; Proc. Nat. Acad. Sci. 104: 6200-6205, 2007.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17400754/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;17400754&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=17400754[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1073/pnas.0609174104&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="17400754">James et al. (2007)</a> solved the crystal structure of the TRIM21 PRYSPRY domain in complex with Fc to 2.35-angstrom resolution. The PRYSPRY binding surface was formed by 6 extended loops, and mutation analysis showed that asp355, trp381, trp383, and phe450 were required for Fc binding. PRYSPRY bound the CH2-CH3 site of Fc, and the stoichiometry was 2 molecules of PRYSPRY to 1 Fc fragment. Binding between PRYSPRY and Fc was independent of pH from pH 8 to pH 5, but it was highly salt sensitive. <a href="#4" class="mim-tip-reference" title="James, L. C., Keeble, A. H., Khan, Z., Rhodes, D. A., Trowsdale, J. &lt;strong&gt;Structural basis for PRYSPRY-mediated tripartite motif (TRIM) protein function.&lt;/strong&gt; Proc. Nat. Acad. Sci. 104: 6200-6205, 2007.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/17400754/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;17400754&lt;/a&gt;, &lt;a href=&quot;https://www.ncbi.nlm.nih.gov/pmc/?term=17400754[PMID]&amp;report=imagesdocsum&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed Image&#x27;, &#x27;domain&#x27;: &#x27;ncbi.nlm.nih.gov&#x27;})&quot;&gt;images&lt;/a&gt;] [&lt;a href=&quot;https://doi.org/10.1073/pnas.0609174104&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;destination&#x27;: &#x27;Publisher&#x27;})&quot;&gt;Full Text&lt;/a&gt;]" pmid="17400754">James et al. (2007)</a> hypothesized that during autoimmune disease, anti-TRIM21 antibodies bind epitopes in the RING and B-box domains of TRIM21 via their antigen-binding fragment (Fab) and also bind to the PRYSPRY domain of TRIM21 via their Fc portions. Simultaneous binding of Fab and Fc to TRIM21 is likely to occur between distinct TRIM21 molecules via an antibody bipolar bridging mechanism, a feature of pathogenic superantigens, and form large crosslinked immune complexes. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17400754" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p><a href="#1" class="mim-tip-reference" title="Frank, M. B., Itoh, K., Fujisaku, A., Pontarotti, P., Mattei, M.-G., Neas, B. R. &lt;strong&gt;The mapping of the human 52-kD Ro/SSA autoantigen gene to human chromosome 11, and its polymorphisms.&lt;/strong&gt; Am. J. Hum. Genet. 52: 183-191, 1993.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8094596/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8094596&lt;/a&gt;]" pmid="8094596">Frank et al. (1993)</a> determined that the TRIM21 gene contains at least 3 exons. The exon encoding the putative zinc fingers of the protein is separate from that encoding the leucine zipper. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8094596" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<p>By radioisotopic in situ hybridization, <a href="#1" class="mim-tip-reference" title="Frank, M. B., Itoh, K., Fujisaku, A., Pontarotti, P., Mattei, M.-G., Neas, B. R. &lt;strong&gt;The mapping of the human 52-kD Ro/SSA autoantigen gene to human chromosome 11, and its polymorphisms.&lt;/strong&gt; Am. J. Hum. Genet. 52: 183-191, 1993.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8094596/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8094596&lt;/a&gt;]" pmid="8094596">Frank et al. (1993)</a> mapped the TRIM21 gene to chromosome 11p15.5. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8094596" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<a id="molecularGenetics" class="mim-anchor"></a>
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<p><a href="#1" class="mim-tip-reference" title="Frank, M. B., Itoh, K., Fujisaku, A., Pontarotti, P., Mattei, M.-G., Neas, B. R. &lt;strong&gt;The mapping of the human 52-kD Ro/SSA autoantigen gene to human chromosome 11, and its polymorphisms.&lt;/strong&gt; Am. J. Hum. Genet. 52: 183-191, 1993.[PubMed: &lt;a href=&quot;https://pubmed.ncbi.nlm.nih.gov/8094596/&quot; target=&quot;_blank&quot; onclick=&quot;gtag(&#x27;event&#x27;, &#x27;mim_outbound&#x27;, {&#x27;name&#x27;: &#x27;PubMed&#x27;, &#x27;domain&#x27;: &#x27;pubmed.ncbi.nlm.nih.gov&#x27;})&quot;&gt;8094596&lt;/a&gt;]" pmid="8094596">Frank et al. (1993)</a> identified a RFLP of the TRIM21 gene and demonstrated that it was associated with SLE, primarily in black Americans. <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8094596" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})"><span class="glyphicon glyphicon-plus-sign mim-tip-hint" title="Click this 'reference-plus' icon to see articles related to this paragraph in PubMed."></span></a></p>
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<strong>REFERENCES</strong>
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<a id="Frank1993" class="mim-anchor"></a>
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Frank, M. B., Itoh, K., Fujisaku, A., Pontarotti, P., Mattei, M.-G., Neas, B. R.
<strong>The mapping of the human 52-kD Ro/SSA autoantigen gene to human chromosome 11, and its polymorphisms.</strong>
Am. J. Hum. Genet. 52: 183-191, 1993.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/8094596/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">8094596</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=8094596" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
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<a id="Frank1999" class="mim-anchor"></a>
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Frank, M. B.
<strong>Characterization of DNA binding properties and sequence specificity of the human 52 kDa Ro/SS-A (Ro52) zinc finger protein.</strong>
Biochem. Biophys. Res. Commun. 259: 665-670, 1999.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/10364476/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">10364476</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=10364476" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1006/bbrc.1999.0835" target="_blank">Full Text</a>]
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<a id="Itoh1991" class="mim-anchor"></a>
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Itoh, K., Itoh, Y., Frank, M. B.
<strong>Protein heterogeneity in the human Ro/SSA ribonucleoproteins: the 52- and 60-kD Ro/SSA autoantigens are encoded by separate genes.</strong>
J. Clin. Invest. 87: 177-186, 1991.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/1985094/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">1985094</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=1985094" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1172/JCI114968" target="_blank">Full Text</a>]
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<a id="James2007" class="mim-anchor"></a>
<div class="">
<p class="mim-text-font">
James, L. C., Keeble, A. H., Khan, Z., Rhodes, D. A., Trowsdale, J.
<strong>Structural basis for PRYSPRY-mediated tripartite motif (TRIM) protein function.</strong>
Proc. Nat. Acad. Sci. 104: 6200-6205, 2007.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/17400754/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">17400754</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=17400754[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=17400754" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1073/pnas.0609174104" target="_blank">Full Text</a>]
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<a id="Park2020" class="mim-anchor"></a>
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Park, J. S., Burckhardt, C. J., Lazcano, R., Solis, L. M., Isogai, T., Li, L., Chen, C. S., Gao, B., Minna, J. D., Bachoo, R., DeBerardinis, R. J., Danuser, G.
<strong>Mechanical regulation of glycolysis via cytoskeleton architecture.</strong>
Nature 578: 621-626, 2020.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/32051585/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">32051585</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=32051585[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=32051585" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1038/s41586-020-1998-1" target="_blank">Full Text</a>]
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<a id="Sjostrand2019" class="mim-anchor"></a>
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Sjostrand, M., Carow, B., Nyberg, W. A., Covacu, R., Rottenberg, M. E., Espinosa, A.
<strong>TRIM21 controls Toll-like receptor 2 responses in bone-marrow-derived macrophages.</strong>
Immunology 159: 335-343, 2019.
[PubMed: <a href="https://pubmed.ncbi.nlm.nih.gov/31755557/" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">31755557</a>, <a href="https://www.ncbi.nlm.nih.gov/pmc/?term=31755557[PMID]&report=imagesdocsum" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Image', 'domain': 'ncbi.nlm.nih.gov'})">images</a>, <a href="https://pubmed.ncbi.nlm.nih.gov/?cmd=link&linkname=pubmed_pubmed&from_uid=31755557" target="_blank" onclick="gtag('event', 'mim_outbound', {'name': 'PubMed Related', 'domain': 'pubmed.ncbi.nlm.nih.gov'})">related citations</a>]
[<a href="https://doi.org/10.1111/imm.13157" target="_blank">Full Text</a>]
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Bao Lige - updated : 03/02/2022
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Ada Hamosh - updated : 09/25/2020<br>Patricia A. Hartz - updated : 8/25/2008
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Victor A. McKusick : 3/1/1993
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mgross : 03/02/2022<br>alopez : 09/25/2020<br>mgross : 08/27/2008<br>terry : 8/25/2008<br>wwang : 2/26/2007<br>mgross : 2/13/2003<br>mark : 8/25/1997<br>jason : 7/28/1994<br>carol : 12/22/1993<br>carol : 3/20/1993<br>carol : 3/1/1993
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<h3>
<span class="mim-font">
<strong>*</strong> 109092
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<span class="mim-font">
TRIPARTITE MOTIF-CONTAINING PROTEIN 21; TRIM21
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<span class="mim-font">
<em>Alternative titles; symbols</em>
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<span class="mim-font">
SJOGREN SYNDROME ANTIGEN A1; SSA1<br />
SICCA SYNDROME ANTIGEN A; SSA<br />
AUTOANTIGEN Ro/SSA, 52-KD; RO52
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<strong><em>HGNC Approved Gene Symbol: TRIM21</em></strong>
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<strong>
<em>
Cytogenetic location: 11p15.4
&nbsp;
Genomic coordinates <span class="small">(GRCh38)</span> : 11:4,384,897-4,393,702 </span>
</em>
</strong>
<span class="small">(from NCBI)</span>
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<strong>TEXT</strong>
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<strong>Description</strong>
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<p>TRIM21 is an E3 ubiquitin ligase that controls responses to TLR2 agonists (Sjostrand et al., 2019). </p>
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<strong>Cloning and Expression</strong>
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<p>Ro/SSA is a ribonucleoprotein particle composed of a single polypeptide and 1 of 4 small RNA molecules. Autoantibodies to Ro/SSA are present in 30 to 50% of patients with systemic lupus erythematosus (SLE; 152700) and in at least half of patients with primary Sjogren syndrome (270150). At least 2 distinct Ro/SSA polypeptides exist, a 60-kD form (TROVE2; 600063) and a 52-kD form. Using serum from a lupus patient to screen a human thymocyte cDNA expression library, Itoh et al. (1991) cloned TRIM21, which encodes the 52-kD Ro/SSA antigen. The deduced 475-amino acid protein has a calculated molecular mass of 54.1 kD. It has multiple N-terminal zinc finger motifs, a central leucine zipper, and a potential N-glycosylation site. Predicted hydrophobic regions are located at the N terminus, in the center of the molecule, and at the C terminus. Western blot analysis of lymphocyte extracts using patient serum confirmed that TRIM21 had an apparent molecular mass of 52 kD. </p><p>James et al. (2007) stated that the human TRIM21 protein contains an N-terminal RING finger that has E3 ligase activity, followed by a B box, 2 coiled-coil regions, and a long C-terminal PRYSPRY domain that binds IgG (see 147100) Fc fragments. </p><p>Using an EGFP reporter inserted into the Trim21 locus, Sjostrand et al. (2019) showed that Trim21 was expressed in macrophages and dendritic cells of mice. </p>
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<strong>Gene Function</strong>
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<p>Frank (1999) found that human RO52 expressed in insect cells bound double-stranded but not single-stranded DNA, and that zinc was required for binding. Sequencing oligonucleotides bound by RO52 revealed a purine-rich consensus motif, ARGRGGG(G/C)(A/C)GRNGA, in which R represents a purine and N indicates no consensus. </p><p>Using microarray analysis, Sjostrand et al. (2019) showed that maturation of bone marrow-derived macrophages (BMDMs) from Trim21 -/- mice was reduced in response to macrophage colony-stimulating factor (MCSF, or CSF2; 120420). Trim21 -/- BMDMs became hyporesponsive to stimulation with the TLR2 ligand PAM3CSK4, indicating that Trim21 was necessary for optimal responses to TLR2 agonists. Trim21 -/- BMDMs also became hyporesponsive to stimulation with Mycobacterium bovis Bacillus Calmette-Guerin (BCG), suggesting that Trim21 was also necessary for full responses to more complex stimuli. </p><p>Park et al. (2020) reported that the transfer of human bronchial epithelial cells from stiff to soft substrates caused a downregulation of glycolysis via proteasomal degradation of the rate-limiting metabolic enzyme phosphofructokinase (PFK; see PFKP, 171840). PFK degradation was triggered by the disassembly of stress fibers, which released the PFK-targeting E3 ubiquitin ligase TRIM21. Transformed non-small-cell lung cancer cells, which maintain high glycolytic rates regardless of changing environmental mechanics, retained PFK expression by downregulating TRIM21, and by sequestering residual TRIM21 on a stress fiber subset that is insensitive to substrate stiffness. Park et al. (2020) concluded that their data revealed a mechanism by which glycolysis responds to architectural features of the actomyosin cytoskeleton, thus coupling cell metabolism to the mechanical properties of the surrounding tissue. These processes enable normal cells to tune energy production in variable microenvironments, whereas the resistance of the cytoskeleton in response to mechanical cues enables the persistence of high glycolytic rates in cancer cells despite constant alterations of the tumor tissue. </p>
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<strong>Biochemical Features</strong>
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<p>James et al. (2007) solved the crystal structure of the TRIM21 PRYSPRY domain in complex with Fc to 2.35-angstrom resolution. The PRYSPRY binding surface was formed by 6 extended loops, and mutation analysis showed that asp355, trp381, trp383, and phe450 were required for Fc binding. PRYSPRY bound the CH2-CH3 site of Fc, and the stoichiometry was 2 molecules of PRYSPRY to 1 Fc fragment. Binding between PRYSPRY and Fc was independent of pH from pH 8 to pH 5, but it was highly salt sensitive. James et al. (2007) hypothesized that during autoimmune disease, anti-TRIM21 antibodies bind epitopes in the RING and B-box domains of TRIM21 via their antigen-binding fragment (Fab) and also bind to the PRYSPRY domain of TRIM21 via their Fc portions. Simultaneous binding of Fab and Fc to TRIM21 is likely to occur between distinct TRIM21 molecules via an antibody bipolar bridging mechanism, a feature of pathogenic superantigens, and form large crosslinked immune complexes. </p>
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<strong>Gene Structure</strong>
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<p>Frank et al. (1993) determined that the TRIM21 gene contains at least 3 exons. The exon encoding the putative zinc fingers of the protein is separate from that encoding the leucine zipper. </p>
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<strong>Mapping</strong>
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<span class="mim-text-font">
<p>By radioisotopic in situ hybridization, Frank et al. (1993) mapped the TRIM21 gene to chromosome 11p15.5. </p>
</span>
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<span class="mim-font">
<strong>Molecular Genetics</strong>
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<p>Frank et al. (1993) identified a RFLP of the TRIM21 gene and demonstrated that it was associated with SLE, primarily in black Americans. </p>
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<span class="mim-font">
<strong>REFERENCES</strong>
</span>
</h4>
<div>
<p />
</div>
<div>
<ol>
<li>
<p class="mim-text-font">
Frank, M. B., Itoh, K., Fujisaku, A., Pontarotti, P., Mattei, M.-G., Neas, B. R.
<strong>The mapping of the human 52-kD Ro/SSA autoantigen gene to human chromosome 11, and its polymorphisms.</strong>
Am. J. Hum. Genet. 52: 183-191, 1993.
[PubMed: 8094596]
</p>
</li>
<li>
<p class="mim-text-font">
Frank, M. B.
<strong>Characterization of DNA binding properties and sequence specificity of the human 52 kDa Ro/SS-A (Ro52) zinc finger protein.</strong>
Biochem. Biophys. Res. Commun. 259: 665-670, 1999.
[PubMed: 10364476]
[Full Text: https://doi.org/10.1006/bbrc.1999.0835]
</p>
</li>
<li>
<p class="mim-text-font">
Itoh, K., Itoh, Y., Frank, M. B.
<strong>Protein heterogeneity in the human Ro/SSA ribonucleoproteins: the 52- and 60-kD Ro/SSA autoantigens are encoded by separate genes.</strong>
J. Clin. Invest. 87: 177-186, 1991.
[PubMed: 1985094]
[Full Text: https://doi.org/10.1172/JCI114968]
</p>
</li>
<li>
<p class="mim-text-font">
James, L. C., Keeble, A. H., Khan, Z., Rhodes, D. A., Trowsdale, J.
<strong>Structural basis for PRYSPRY-mediated tripartite motif (TRIM) protein function.</strong>
Proc. Nat. Acad. Sci. 104: 6200-6205, 2007.
[PubMed: 17400754]
[Full Text: https://doi.org/10.1073/pnas.0609174104]
</p>
</li>
<li>
<p class="mim-text-font">
Park, J. S., Burckhardt, C. J., Lazcano, R., Solis, L. M., Isogai, T., Li, L., Chen, C. S., Gao, B., Minna, J. D., Bachoo, R., DeBerardinis, R. J., Danuser, G.
<strong>Mechanical regulation of glycolysis via cytoskeleton architecture.</strong>
Nature 578: 621-626, 2020.
[PubMed: 32051585]
[Full Text: https://doi.org/10.1038/s41586-020-1998-1]
</p>
</li>
<li>
<p class="mim-text-font">
Sjostrand, M., Carow, B., Nyberg, W. A., Covacu, R., Rottenberg, M. E., Espinosa, A.
<strong>TRIM21 controls Toll-like receptor 2 responses in bone-marrow-derived macrophages.</strong>
Immunology 159: 335-343, 2019.
[PubMed: 31755557]
[Full Text: https://doi.org/10.1111/imm.13157]
</p>
</li>
</ol>
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<br />
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Contributors:
</span>
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<div class="col-lg-6 col-md-6 col-sm-6 col-xs-6">
<span class="mim-text-font">
Bao Lige - updated : 03/02/2022<br>Ada Hamosh - updated : 09/25/2020<br>Patricia A. Hartz - updated : 8/25/2008
</span>
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Creation Date:
</span>
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Victor A. McKusick : 3/1/1993
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carol : 03/03/2022<br>mgross : 03/02/2022<br>alopez : 09/25/2020<br>mgross : 08/27/2008<br>terry : 8/25/2008<br>wwang : 2/26/2007<br>mgross : 2/13/2003<br>mark : 8/25/1997<br>jason : 7/28/1994<br>carol : 12/22/1993<br>carol : 3/20/1993<br>carol : 3/1/1993
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NOTE: OMIM is intended for use primarily by physicians and other professionals concerned with genetic disorders, by genetics researchers,
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OMIM<sup>&reg;</sup> and Online Mendelian Inheritance in Man<sup>&reg;</sup> are registered trademarks of the Johns Hopkins University.
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Copyright<sup>&reg;</sup> 1966-2025 Johns Hopkins University.
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Printed: March 6, 2025
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