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<option value="summary-text">Summary (text)</option>
<option value="abstract">Abstract</option>
<option value="abstract-text">Abstract (text)</option>
</select>
</div>
<div class="include-supplemental-container">
<input type="checkbox" aria-label="Include MeSH and other data" name="include-supplemental" id="email-include-supplemental" class="email-include-supplemental">
<label for="email-include-supplemental" class="email-include-supplemental-label">MeSH and other data</label>
</div>
<div class="form-field recaptcha ">
<div class="g-recaptcha" id="id-recaptcha" data-sitekey="6LfsWHMdAAAAAClKbtOpjQ2pMjgsGxvv7NdZW9uI"></div>
</div>
<div id="captcha-error-message" class="usa-input-error-message captcha-validation-message" role="alert"></div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Sending..."
data-ga-category="save_share"
data-ga-action="email"
data-ga-label="send">
Send email
</button>
<button class="action-panel-cancel"
aria-label="Close 'Email citations' panel"
ref="linksrc=close_email_panel"
aria-controls="email-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="email"
data-ga-label="cancel">
Cancel
</button>
</div>
<input type="hidden" name="email-search-details" value="" />
<input type="hidden" name="email-search-details-hash" value="0e42663a6c3bd85498fcb88798998fed7bfdc45d457db35281e41afe13cc0524" />
</form>
</div>
</div>
<div id="collections-action-panel"
class="collections-action-panel action-panel in-progress-dots-panel"
aria-hidden="true"
data-collections-open-panel-enabled="false"
data-collections-open-panel-url-hash="#open-collections-panel">
<div class="inner-wrap">
<h3 class="action-panel-heading">
Add to Collections
</h3>
<form id="collections-action-panel-form"
class="collections-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
data-existing-collections-url="/list-existing-collections/"
data-add-to-existing-collection-url="/add-to-existing-collection/"
data-create-and-add-to-new-collection-url="/create-and-add-to-new-collection/"
data-get-article-ids-by-search-url="/get-article-ids-by-search/"
data-myncbi-max-collection-name-length="100"
data-add-to-collection-max-amount="1000"
data-collections-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/">
<input type="hidden" name="csrfmiddlewaretoken" value="9Js2VlfvMa0yH0aVoR1r1af47AkNGntqqwc7ybIRmLN2BrgL1aEtviLIFE2ZzY1K">
<div class="choice-group" role="radiogroup">
<ul class="radio-group-items">
<li>
<input type="radio"
id="collections-action-panel-new"
class="collections-new"
name="collections"
value="new"
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="collections_radio_new">
<label for="collections-action-panel-new">Create a new collection</label>
</li>
<li>
<input type="radio"
id="collections-action-panel-existing"
class="collections-existing"
name="collections"
value="existing"
checked="true"
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="collections_radio_existing">
<label for="collections-action-panel-existing">Add to an existing collection</label>
</li>
</ul>
</div>
<div class="controls-wrapper">
<div class="action-panel-control-wrap new-collections-controls">
<label for="collections-action-panel-add-to-new" class="action-panel-label required-field-asterisk">
Name your collection:
</label>
<input
type="text"
name="add-to-new-collection"
id="collections-action-panel-add-to-new"
class="collections-action-add-to-new"
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/"
maxlength="100"
data-ga-category="save_share"
data-ga-action="create_collection"
data-ga-label="non_favorties_collection">
<div class="collections-new-name-too-long usa-input-error-message selection-validation-message">
Name must be less than 100 characters
</div>
</div>
<div class="action-panel-control-wrap existing-collections-controls">
<label for="collections-action-panel-add-to-existing" class="action-panel-label">
Choose a collection:
</label>
<select id="collections-action-panel-add-to-existing"
class="action-panel-selector collections-action-add-to-existing"
data-ga-category="save_share"
data-ga-action="select_collection"
data-ga-label="($('#collections-action-add-to-existing').val() === 'Favorites') ? 'Favorites' : 'non_favorites_collection'">
</select>
<div class="collections-retry-load-on-error usa-input-error-message selection-validation-message">
Unable to load your collection due to an error<br>
<a href="#">Please try again</a>
</div>
</div>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Adding..."
data-pinger-ignore
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="add">
Add
</button>
<button class="action-panel-cancel"
aria-label="Close 'Add to Collections' panel"
ref="linksrc=close_collections_panel"
aria-controls="collections-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="collections"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="bibliography-action-panel"
class="bibliography-action-panel action-panel in-progress-dots-panel"
aria-hidden="true"
data-bibliography-open-panel-enabled="false"
data-bibliography-open-panel-url-hash="#open-bibliography-panel">
<div class="inner-wrap">
<h3 class="action-panel-heading">
Add to My Bibliography
</h3>
<form id="bibliography-action-panel-form"
class="bibliography-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
data-add-to-bibliography-max-amount="100"
data-add-to-bibliography-batch-size="10"
data-bibliography-delegates-url="/list-bibliography-delegates/"
data-add-to-bibliography-url="/add-to-bibliography/"
data-get-article-ids-by-search-url="/get-article-ids-by-search/"
data-mybib-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/mybibliography/">
<input type="hidden" name="csrfmiddlewaretoken" value="9Js2VlfvMa0yH0aVoR1r1af47AkNGntqqwc7ybIRmLN2BrgL1aEtviLIFE2ZzY1K">
<div class="action-panel-control-wrap bibliographies-controls">
<div class="choice-group">
<ul class="bibliographies-action-add radio-group-items">
<li>
<input name="bibliography" id="my-bibliography" class="my-bibliography" type="radio" checked/>
<label for="my-bibliography">My Bibliography</label>
</li>
</ul>
</div>
</div>
<div class="bibliographies-retry-load-on-error usa-input-error-message selection-validation-message">
Unable to load your delegates due to an error<br>
<a href="#">Please try again</a>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Adding..."
data-pinger-ignore>
Add
</button>
<button class="action-panel-cancel"
aria-label="Close 'Add to bibliography' panel"
ref="linksrc=close_bibliography_panel"
aria-controls="bibliography-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="mybib"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="saved-search-action-panel" class="saved-search-action-panel action-panel " aria-hidden="true"
data-saved-search-open-panel-enabled="false"
data-saved-search-open-panel-url-hash="#open-saved-search-panel">
<div class="inner-wrap">
<h2 class="action-panel-heading">
Your saved search
</h2>
<form id="saved-search-action-panel-form"
class="saved-search-action-panel-form action-panel-content action-form"
data-create-saved-search-url="/create-saved-search/"
data-try-search-terms-url="/try-search-term/"
data-saved-search-root-url="https://www.ncbi.nlm.nih.gov/myncbi/searches/">
<input type="hidden" name="csrfmiddlewaretoken" value="9Js2VlfvMa0yH0aVoR1r1af47AkNGntqqwc7ybIRmLN2BrgL1aEtviLIFE2ZzY1K">
<div class="action-panel-control-wrap">
<label for="saved-search-name" class="action-panel-label saved-search-name-label required-field-asterisk">
Name of saved search:
</label>
<input maxlength="200"
type="text"
name="saved-search-name"
id="saved-search-name"
class="saved-search-name"
value=""
required
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/">
</div>
<div class="action-panel-control-wrap">
<label for="saved-search-term" class="action-panel-label required-field-asterisk">
Search terms:
</label>
<textarea name="saved-search-term" id="saved-search-term" class="saved-search-term" required></textarea>
</div>
<div class="test-search-term-wrap">
<a href="#" class="try-search-term">Test search terms</a>
</div>
<div class="choice-group action-panel-extra-margin-top">
<span class="action-panel-label" id="fieldset-label">
Would you like email updates of new search results?
</span>
<fieldset id="saved-search-alert" aria-describedby="fieldset-label">
<legend class="usa-sr-only">Saved Search Alert Radio Buttons</legend>
<ul class="radio-group-items">
<li>
<input type="radio" id="saved-search-alert-yes" class="saved-search-alert-yes" name="saved-search-alert" value="yes" checked>
<label for="saved-search-alert-yes" class="action-panel-label">Yes</label>
</li>
<li>
<input aria-label="No radio input" type="radio" id="saved-search-alert-no" class="saved-search-alert-no" name="saved-search-alert" value="no">
<label for="saved-search-alert-no" class="action-panel-label">No</label>
</li>
</ul>
</fieldset>
</div>
<div class="alert-schedule-wrap">
<div class="action-panel-control-wrap">
<label class="action-panel-label">
Email:
</label>
<span aria-label="Email address" id="saved-search-email" class="action-panel-label"><span class="action-panel-label-bold"></span> (<a class="myncbi-account-settings" href="https://www.ncbi.nlm.nih.gov/account/settings/">change</a>)</span>
</div>
<div class="action-panel-control-wrap action-panel-extra-margin-top">
<label for="saved-search-frequency" class="action-panel-label">
Frequency:
</label>
<select id="saved-search-frequency" class="no-border-panel-selector saved-search-frequency">
<option value="monthly">Monthly</option>
<option value="weekly">Weekly</option>
<option value="daily">Daily</option>
</select>
</div>
<div class="action-panel-control-wrap saved-search-monthly-additional">
<label for="saved-search-monthly-on-day" class="action-panel-label">
Which day?
</label>
<select id="saved-search-monthly-on-day" class="no-border-panel-selector">
<option value="Sunday">The first Sunday</option>
<option value="Monday">The first Monday</option>
<option value="Tuesday">The first Tuesday</option>
<option value="Wednesday">The first Wednesday</option>
<option value="Thursday">The first Thursday</option>
<option value="Friday">The first Friday</option>
<option value="Saturday">The first Saturday</option>
<option value="day">The first day</option>
<option value="weekday">The first weekday</option>
</select>
</div>
<div class="action-panel-control-wrap saved-search-weekly-additional">
<label for="saved-search-weekly-on-day" class="action-panel-label">
Which day?
</label>
<select id="saved-search-weekly-on-day" class="no-border-panel-selector saved-search-weekly-on-day">
<option value="Sunday">Sunday</option>
<option value="Monday">Monday</option>
<option value="Tuesday">Tuesday</option>
<option value="Wednesday">Wednesday</option>
<option value="Thursday">Thursday</option>
<option value="Friday">Friday</option>
<option value="Saturday">Saturday</option>
</select>
</div>
<div class="action-panel-control-wrap">
<label for="saved-search-report" class="action-panel-label">
Report format:
</label>
<select id="saved-search-report" class="no-border-panel-selector saved-search-report">
<option value="DocSum">Summary</option>
<option value="DocSumText">Summary (text)</option>
<option value="Abstract">Abstract</option>
<option value="AbstractText">Abstract (text)</option>
<option value="MEDLINE">PubMed</option>
</select>
</div>
<div class="action-panel-control-wrap">
<label for="saved-search-amount" class="action-panel-label">
Send at most:
</label>
<select id="saved-search-amount" class="no-border-panel-selector saved-search-amount">
<option value="1">1 item</option>
<option value="5" selected>5 items</option>
<option value="10">10 items</option>
<option value="20">20 items</option>
<option value="50">50 items</option>
<option value="100">100 items</option>
<option value="200">200 items</option>
</select>
</div>
<div>
<input type="checkbox" id="saved-search-send-if-no-result" class="saved-search-send-if-no-result" name="saved-search-send-if-no-result">
<label for="saved-search-send-if-no-result" class="action-panel-label smaller-checkbox">
Send even when there aren't any new results
</label>
</div>
<div class="action-panel-control-wrap option-text-in-email-wrap">
<label for="saved-search-email-text" class="action-panel-label">
Optional text in email:
</label>
<textarea name="saved-search-email-text"
id="saved-search-email-text"
class="saved-search-email-text"></textarea>
</div>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Saving..."
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="save">
Save
</button>
<button class="action-panel-cancel"
aria-label="Close 'Your saved search' panel"
ref="linksrc=close_saved_search_panel"
aria-controls="saved-search-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="citation-manager-action-panel" class="citation-manager-action-panel action-panel" aria-hidden="true">
<div class="inner-wrap">
<h2 class="action-panel-heading">
Create a file for external citation management software
</h2>
<form id="citation-manager-action-panel-form"
class="action-panel-content action-form"
action="/results-export-ids/"
data-by-search-action="/results-export-search-data/"
data-by-ids-action="/results-export-ids/"
method="post"
data-by-search-method="post"
data-by-ids-method="post">
<input type="hidden" name="csrfmiddlewaretoken" value="9Js2VlfvMa0yH0aVoR1r1af47AkNGntqqwc7ybIRmLN2BrgL1aEtviLIFE2ZzY1K">
<input name="results-format" type="hidden" value="pubmed"/>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Sending..."
data-ga-category="save_share"
data-ga-action="citation_manager"
data-ga-label="save">
Create file
</button>
<button class="action-panel-cancel"
aria-label="Close 'Send citations to citation manager' panel"
ref="linksrc=close_citation_manager_panel"
aria-controls="citation-manager-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="citation_manager"
data-ga-label="cancel">
Cancel
</button>
</div>
</form>
</div>
</div>
<div id="rss-action-panel" class="rss-action-panel action-panel " aria-hidden="true">
<div class="inner-wrap">
<h2 class="action-panel-heading">
Your RSS Feed
</h2>
<form id="rss-action-panel-form"
class="rss-action-panel-form action-panel-content action-form"
data-create-rss-feed-url="/create-rss-feed-url/"
data-search-form-term-value="">
<input type="hidden" name="csrfmiddlewaretoken" value="9Js2VlfvMa0yH0aVoR1r1af47AkNGntqqwc7ybIRmLN2BrgL1aEtviLIFE2ZzY1K">
<div class="action-panel-control-wrap">
<label for="rss-name" class="action-panel-label required-field-asterisk">
Name of RSS Feed:
</label>
<input maxlength="200"
placeholder="Name"
type="text"
name="rss-name"
id="rss-name"
class="rss-name"
value=''
required
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/">
</div>
<div class="rss-limit-wrap">
<div class="action-panel-control-wrap action-panel-extra-margin-top">
<label for="rss-limit" class="action-panel-label">
Number of items displayed:
</label>
<select id="rss-limit" class="no-border-panel-selector rss-limit">
<option value="5">5</option>
<option value="10">10</option>
<option value="15" selected="selected">15</option>
<option value="20">20</option>
<option value="50">50</option>
<option value="100">100</option>
</select>
</div>
</div>
<div class="action-panel-actions">
<button class="action-panel-submit"
type="submit"
data-loading-label="Creating..."
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="save">
Create RSS
</button>
<button class="action-panel-cancel"
aria-label="Close 'Your RSS' panel"
ref="linksrc=close_rss_panel"
aria-controls="rss-action-panel"
aria-expanded="false"
data-ga-category="save_share"
data-ga-action="alert"
data-ga-label="cancel">
Cancel
</button>
</div>
<div class="action-panel-control-wrap rss-link-copy-wrap">
<label for="rss-link" class="usa-sr-only">RSS Link</label>
<input placeholder="Your RSS Feed Link" type="text" name="rss-link" id="rss-link" class="rss-link" title="RSS Link">
<button
type="button"
disabled
class="rss-link-copy-button disabled"
data-ga-category="save_share"
data-ga-action="rss"
data-ga-label="copy">
Copy
</button>
</div>
</form>
</div>
</div>
</div>
</div>
<div class="article-page" id="article-page" data-article-pmid="25705216">
<aside class="page-sidebar">
<div class="inner-wrap">
<div class="full-text-links">
<div class="full-view">
<h3 class="title">
Full text links
</h3>
<div class="full-text-links-list">
<a class="link-item
dialog-focus"
href="https://doi.org/10.3389/fgene.2015.00021"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=False&amp;PrId=6956&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=25705216&amp;db=pubmed&amp;nlmid=101560621"
title="See full text options at Frontiers Media SA"
data-ga-category="full_text"
data-ga-action="Frontiers Media SA"
data-ga-label="25705216"
><img src="https://cdn.ncbi.nlm.nih.gov/corehtml/query/egifs/https:--www.frontiersin.org-alerts-logo-PubMed.png" alt="Frontiers Media SA full text link"><span class="text">
Frontiers Media SA
</span></a><a class="link-item
pmc
"
href="https://pmc.ncbi.nlm.nih.gov/articles/pmid/25705216/"
target="_blank"
rel="noopener"
ref="linksrc=fulltextorjournal_fulltext&amp;is_pmc=True&amp;PrId=3494&amp;itool=Abstract-def&amp;log$=linkouticon&amp;uid=25705216&amp;db=pubmed&amp;nlmid=101560621"
title="Free full text at PubMed Central"
data-ga-category="full_text"
data-ga-action="PMC"
data-ga-label="25705216"
><span class="text">
Free PMC article
</span></a>
</div>
</div>
<div class="short-view">
<a href="#" class="full-text-links-button full-text-links-dialog-trigger">
Full text links
</a>
</div>
</div>
<div class="actions-buttons sidebar"><h3 class="title">Actions</h3><div class="inner-wrap"><button class="citation-button citation-dialog-trigger"
aria-label="Open dialog with citation text in different styles"
data-ga-category="save_share"
data-ga-action="cite"
data-ga-label="open"
data-all-citations-url="/25705216/citations/"
data-citation-style="nlm"
data-pubmed-format-link="/25705216/export/"><span class="button-label">Cite</span></button><link type="text/css" href="ncbi-overlay-block/src/overlay-block.css"><div class="collections-button-container" data-article-id="25705216" data-article-db="pubmed"><button class="collections-button collections-dialog-trigger"
aria-label="Save article in MyNCBI collections."
data-ga-category="collections_button"
data-ga-action="click"
data-ga-label="collections_button"
data-collections-open-dialog-enabled="false"
data-collections-open-dialog-url="https://account.ncbi.nlm.nih.gov/?back_url=https%3A%2F%2Fpubmed.ncbi.nlm.nih.gov%2F25705216%2F%23open-collections-dialog"
data-in-collections="false"><span class="button-label">Collections</span></button><div class="overlay" role="dialog"><div id="collections-action-dialog"
class="dialog collections-dialog"
aria-hidden="true"><div class="title">Add to Collections</div><div class="collections-action-panel action-panel"><form id="collections-action-dialog-form"
class="collections-action-panel-form action-panel-content action-form action-panel-smaller-selectors"
data-existing-collections-url="/list-existing-collections/"
data-add-to-existing-collection-url="/add-to-existing-collection/"
data-create-and-add-to-new-collection-url="/create-and-add-to-new-collection/"
data-myncbi-max-collection-name-length="100"
data-collections-root-url="https://www.ncbi.nlm.nih.gov/myncbi/collections/"><input type="hidden" name="csrfmiddlewaretoken" value="9Js2VlfvMa0yH0aVoR1r1af47AkNGntqqwc7ybIRmLN2BrgL1aEtviLIFE2ZzY1K"><div class="choice-group" role="radiogroup"><ul class="radio-group-items"><li><input type="radio"
id="collections-action-dialog-new"
class="collections-new"
name="collections"
value="new"
data-ga-category="collections_button"
data-ga-action="click"
data-ga-label="collections_radio_new"><label for="collections-action-dialog-new">Create a new collection</label></li><li><input type="radio"
id="collections-action-dialog-existing"
class="collections-existing"
name="collections"
value="existing"
checked="true"
data-ga-category="collections_button"
data-ga-action="click"
data-ga-label="collections_radio_existing"><label for="collections-action-dialog-existing">Add to an existing collection</label></li></ul></div><div class="controls-wrapper"><div class="action-panel-control-wrap new-collections-controls"><label for="collections-action-dialog-add-to-new" class="action-panel-label required-field-asterisk">
Name your collection:
</label><input
type="text"
name="add-to-new-collection"
id="collections-action-dialog-add-to-new"
class="collections-action-add-to-new"
pattern="[^&quot;&amp;=&lt;&gt;\/]*" title="The following characters are not allowed in the Name field: &quot;&amp;=&lt;&gt;/"
maxlength="100"
data-ga-category="collections_button"
data-ga-action="create_collection"
data-ga-label="non_favorties_collection"><div class="collections-new-name-too-long usa-input-error-message selection-validation-message">
Name must be less than 100 characters
</div></div><div class="action-panel-control-wrap existing-collections-controls"><label for="collections-action-dialog-add-to-existing" class="action-panel-label">
Choose a collection:
</label><select id="collections-action-dialog-add-to-existing"
class="action-panel-selector collections-action-add-to-existing"
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Structural modeling of tissue-specific mitochondrial alanyl-tRNA synthetase (AARS2) defects predicts differential effects on aminoacylation
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Structural modeling of tissue-specific mitochondrial alanyl-tRNA synthetase (AARS2) defects predicts differential effects on aminoacylation
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doi: 10.3389/fgene.2015.00021.
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eCollection 2015.
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<li data-affiliation-id="short-view-affiliation-1"
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><sup class="key">1</sup> Research Programs Unit, Molecular Neurology, Biomedicum Helsinki, University of Helsinki Helsinki, Finland.</li>
<li data-affiliation-id="short-view-affiliation-2"
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><sup class="key">2</sup> Department of Clinical Chemistry, University of Gothenburg, Sahlgrenska University Hospital Gothenburg, Sweden.</li>
<li data-affiliation-id="short-view-affiliation-3"
id="short-view-affiliation-3"
><sup class="key">3</sup> Department of Pediatrics, Queen Silvia Children&#x27;s Hospital, University of Gothenburg Gothenburg, Sweden.</li>
<li data-affiliation-id="short-view-affiliation-4"
id="short-view-affiliation-4"
><sup class="key">4</sup> Institute of Genetic Medicine, Wellcome Trust Centre for Mitochondrial Research, Newcastle University Newcastle upon Tyne, UK.</li>
<li data-affiliation-id="short-view-affiliation-5"
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><sup class="key">5</sup> Institute of Neuroscience, Wellcome Trust Centre for Mitochondrial Research, Newcastle University Newcastle upon Tyne, UK.</li>
<li data-affiliation-id="short-view-affiliation-6"
id="short-view-affiliation-6"
><sup class="key">6</sup> Department of Neuropediatrics, Developmental Neurology and Social Pediatrics, University of Essen Essen, Germany.</li>
<li data-affiliation-id="short-view-affiliation-7"
id="short-view-affiliation-7"
><sup class="key">7</sup> Murdoch Childrens Research Institute, Royal Childrens Hospital and Department of Paediatrics, University of Melbourne Melbourne, VIC, Australia.</li>
<li data-affiliation-id="short-view-affiliation-8"
id="short-view-affiliation-8"
><sup class="key">8</sup> Research Programs Unit, Molecular Neurology, Biomedicum Helsinki, University of Helsinki Helsinki, Finland ; Department of Neurology, Helsinki University Central Hospital Helsinki, Finland.</li>
<li data-affiliation-id="short-view-affiliation-9"
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><sup class="key">9</sup> Department of Chemistry, Carleton College Northfield, MN, USA.</li>
<li data-affiliation-id="short-view-affiliation-10"
id="short-view-affiliation-10"
><sup class="key">10</sup> Research Programs Unit, Molecular Neurology, Biomedicum Helsinki, University of Helsinki Helsinki, Finland ; Department of Medical Genetics, Haartman Institute, University of Helsinki Helsinki, Finland.</li>
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The accuracy of mitochondrial protein synthesis is dependent on the coordinated action of nuclear-encoded mitochondrial aminoacyl-tRNA synthetases (mtARSs) and the mitochondrial DNA-encoded tRNAs. The recent advances in whole-exome sequencing have revealed the importance of the mtARS proteins for mitochondrial pathophysiology since nearly every nuclear gene for mtARS (out of 19) is now recognized as a disease gene for mitochondrial disease. Typically, defects in each mtARS have been identified in one tissue-specific disease, most commonly affecting the brain, or in one syndrome. However, mutations in the AARS2 gene for mitochondrial alanyl-tRNA synthetase (mtAlaRS) have been reported both in patients with infantile-onset cardiomyopathy and in patients with childhood to adulthood-onset leukoencephalopathy. We present here an investigation of the effects of the described mutations on the structure of the synthetase, in an effort to understand the tissue-specific outcomes of the different mutations. The mtAlaRS differs from the other mtARSs because in addition to the aminoacylation domain, it has a conserved editing domain for deacylating tRNAs that have been mischarged with incorrect amino acids. We show that the cardiomyopathy phenotype results from a single allele, causing an amino acid change R592W in the editing domain of AARS2, whereas the leukodystrophy mutations are located in other domains of the synthetase. Nevertheless, our structural analysis predicts that all mutations reduce the aminoacylation activity of the synthetase, because all mtAlaRS domains contribute to tRNA binding for aminoacylation. According to our model, the cardiomyopathy mutations severely compromise aminoacylation whereas partial activity is retained by the mutation combinations found in the leukodystrophy patients. These predictions provide a hypothesis for the molecular basis of the distinct tissue-specific phenotypic outcomes.
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Keywords:
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alanyl-tRNA synthetase; aminoacyl-tRNA synthetases; mitochondrial disease; structural modeling; tissue-specificity.
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data-image-width="742"
data-image-height="444"
data-image-alt="FIGURE 1"
data-pmc-id="PMC4319469"
data-figure-id="F1">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-0"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/71d1/4319469/859bcf4202aa/fgene-06-00021-g001.gif"
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<strong class="figure-label">
<p> FIGURE 1 </p>
</strong>
<div class="figure-caption-contents"><b> Patient haplotypes around the <i> AARS2… </i> </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 1 </p>
</strong>
<div class="figure-caption-contents"><b> Patient haplotypes around the <i> AARS2 </i> mutation. </b> The haplotype of the Swedish patient shows…</div>
</div>
<figcaption id="figure-caption-0" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 1
</strong>
<div class="figure-caption-contents"><b>Patient haplotypes around the <i>AARS2</i> mutation.</b> The haplotype of the Swedish patient shows recombination 165 kilobases upstream of the mutation site.</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
itemprop="associatedMedia"
data-slide-index="1"
data-label-slug="figure-2">
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itemprop="contentUrl"
aria-describedby="figure-caption-1"
role="button"
data-image-width="798"
data-image-height="407"
data-image-alt="FIGURE 2"
data-pmc-id="PMC4319469"
data-figure-id="F2">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-1"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/71d1/4319469/a80c9a875f7e/fgene-06-00021-g002.gif"
alt="FIGURE 2" />
</a>
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<strong class="figure-label">
<p> FIGURE 2 </p>
</strong>
<div class="figure-caption-contents"><b> <i> AARS2 </i> mutations. </b> The compound heterozygous…</div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 2 </p>
</strong>
<div class="figure-caption-contents"><b> <i> AARS2 </i> mutations. </b> The compound heterozygous mutations found in patients with cardiomyopathy or leukodystrophy…</div>
</div>
<figcaption id="figure-caption-1" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 2
</strong>
<div class="figure-caption-contents"><b><i>AARS2</i> mutations.</b> The compound heterozygous mutations found in patients with cardiomyopathy or leukodystrophy are illustrated. Truncating mutations that are predicted to destabilize the entire synthetase are marked with dotted lines. The thicker arrows demonstrate recurring mutations. The <i>AARS2</i> mutation leading to the R592W amino acid change has been the only one identified in a homozygous state.</div>
</figcaption>
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<figure class="figure-item "
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itemprop="contentUrl"
aria-describedby="figure-caption-2"
role="button"
data-image-width="777"
data-image-height="1075"
data-image-alt="FIGURE 3"
data-pmc-id="PMC4319469"
data-figure-id="F3">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-2"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/71d1/4319469/097639103271/fgene-06-00021-g003.gif"
alt="FIGURE 3" />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="777">
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<strong class="figure-label">
<p> FIGURE 3 </p>
</strong>
<div class="figure-caption-contents"><b> Sequence alignment between human mtAlaRS… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 3 </p>
</strong>
<div class="figure-caption-contents"><b> Sequence alignment between human mtAlaRS and AlaRS from <i> A. fulgidus </i> (3WQY). </b> The alignment…</div>
</div>
<figcaption id="figure-caption-2" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 3
</strong>
<div class="figure-caption-contents"><b>Sequence alignment between human mtAlaRS and AlaRS from <i>A. fulgidus</i> (3WQY).</b> The alignment was extracted from multiple sequence alignment of AlaRS homologs from eukaryotes and prokaryotes using BioEdit software. The aminoacylation domain is marked with dark gray bar, the editing domain with cyan, and the C-terminal domain with magenta bars. Identical/similar amino acid residues in the same position are marked with colored boxes.</div>
</figcaption>
</figure>
<figure class="figure-item "
itemscope itemtype="http://schema.org/ImageObject"
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data-slide-index="3"
data-label-slug="figure-4">
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itemprop="contentUrl"
aria-describedby="figure-caption-3"
role="button"
data-image-width="777"
data-image-height="642"
data-image-alt="FIGURE 4"
data-pmc-id="PMC4319469"
data-figure-id="F4">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-3"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/71d1/4319469/10efba78fae3/fgene-06-00021-g004.gif"
alt="FIGURE 4" />
</a>
<meta itemprop="width" itemtype="http://schema.org/ImageObject" content="777">
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<div class="figure-caption figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="caption" aria-hidden="true">
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<strong class="figure-label">
<p> FIGURE 4 </p>
</strong>
<div class="figure-caption-contents"><b> Overview of the modeled structure… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 4 </p>
</strong>
<div class="figure-caption-contents"><b> Overview of the modeled structure of human AlaRS. </b> Aminoacylation subdomain (24312 aa) is…</div>
</div>
<figcaption id="figure-caption-3" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 4
</strong>
<div class="figure-caption-contents"><b>Overview of the modeled structure of human AlaRS.</b> Aminoacylation subdomain (24312 aa) is in silver, tRNA recognition subdomain (313477 aa) of aminoacylation domain is in green, linker (“safety belt” 478529 aa) between tRNA recognition and editing domain is presented as solvent interpolated charge surface, β-barrel (530621 aa) and editing core (622783 aa) subdomains of editing domain are in pink and cyan, respectively. C-Ala domain or C-terminal domain is predicted to have helical (784874 aa in magenta) and globular (875985 aa in yellow) subdomains. R480 and R482 from the linker are predicted to stabilize bound tRNA within the aminoacylation domain. Backbone of docked tRNA is shown in dark gray. Docked alanyl-adenylate in the aminoacylation site is shown as stick model with carbon atoms labeled with magenta. Part of β-barrel subdomain (592604 aa) of the editing domain proposed to interact with the linker is marked with purple (see text).</div>
</figcaption>
</figure>
<figure class="figure-item "
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itemprop="associatedMedia"
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data-pmc-id="PMC4319469"
data-figure-id="F5">
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id="article-image-4"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/71d1/4319469/adc2e9c88528/fgene-06-00021-g005.gif"
alt="FIGURE 5" />
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<strong class="figure-label">
<p> FIGURE 5 </p>
</strong>
<div class="figure-caption-contents"><b> Analysis of the contact surface… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 5 </p>
</strong>
<div class="figure-caption-contents"><b> Analysis of the contact surface between linker (“safety belt”) and β-barrel of the… </b></div>
</div>
<figcaption id="figure-caption-4" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 5
</strong>
<div class="figure-caption-contents"><b>Analysis of the contact surface between linker (“safety belt”) and β-barrel of the editing domain in <b><i>A.</i></b><i> fulgidus</i> AlaRS structure (3WQY), which was used as template for modeling. (A)</b> Superimposed chains A “closed” form (blue) and B “open” form (pink). Fragments encompassing residues K474D589 are shown. For superimposition T582V613 fragment was used as tether. <b>(B)</b> Residues from the linker (“safety belt”) interacting with the surface exposed residues on the β-barrel in “closed” conformation. Carbon atoms of interacting amino acid residues are in blue. <b>(C)</b> The position of the same residues in “open” conformation (carbon atoms in magenta). Hydrophobic interactions are marked with magenta dashed lines, electrostatic interactions with orange dashed lines.</div>
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itemprop="contentUrl"
aria-describedby="figure-caption-5"
role="button"
data-image-width="771"
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data-figure-id="F6">
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id="article-image-5"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/71d1/4319469/112b245dba24/fgene-06-00021-g006.gif"
alt="FIGURE 6" />
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<strong class="figure-label">
<p> FIGURE 6 </p>
</strong>
<div class="figure-caption-contents"><b> Analysis of the contact surface… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 6 </p>
</strong>
<div class="figure-caption-contents"><b> Analysis of the contact surface between linker (“safety belt”) and β-barrel of the… </b></div>
</div>
<figcaption id="figure-caption-5" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 6
</strong>
<div class="figure-caption-contents"><b>Analysis of the contact surface between linker (“safety belt”) and β-barrel of the editing domain in modeled human mitochondrial AlaRS. (A)</b> Superimposed chains A “closed” form (green) and B “open” form (yellow). Fragments encompassing residues G468-D621 are shown. For superimposition Q615L646 fragment was used as tether. <b>(B)</b> Interacting residues from the linker (”safety belt”) and surface exposed residues on the β-barrel in ”closed” conformation (shown in khaki). <b>(C)</b> Interacting residue in the “open” conformation (in orange). Hydrophobic interactions are marked with magenta dashed lines. Fragment L494Q505 conserved between mitochondrial AlaRS homologs is marked with red.</div>
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itemprop="contentUrl"
aria-describedby="figure-caption-6"
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data-image-width="777"
data-image-height="613"
data-image-alt="FIGURE 7"
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data-figure-id="F7">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-6"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/71d1/4319469/3cc740201064/fgene-06-00021-g007.gif"
alt="FIGURE 7" />
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<div class="caption-wrap">
<strong class="figure-label">
<p> FIGURE 7 </p>
</strong>
<div class="figure-caption-contents"><b> Mapping and function predictions of… </b></div>
</div>
</div>
<div class="figure-caption-medium figure-caption-text" aria-hidden="true">
<strong class="figure-label">
<p> FIGURE 7 </p>
</strong>
<div class="figure-caption-contents"><b> Mapping and function predictions of <i> AARS2 </i> mutations associated with cardiomyopathy and leukodystrophy. </b> Domains…</div>
</div>
<figcaption id="figure-caption-6" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 7
</strong>
<div class="figure-caption-contents"><b>Mapping and function predictions of <i>AARS2</i> mutations associated with cardiomyopathy and leukodystrophy.</b> Domains are color-coded as in <b>Figure 4</b>. Structural loss-of-function mutations are marked in black, mutations affecting substrate binding and resulting in severe reduction in aminoacylation activity are in red, and mutations resulting in moderate decrease of aminoacylation activity are in orange.</div>
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data-slide-index="7"
data-label-slug="figure-8">
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itemprop="contentUrl"
aria-describedby="figure-caption-7"
role="button"
data-image-width="777"
data-image-height="438"
data-image-alt="FIGURE 8"
data-pmc-id="PMC4319469"
data-figure-id="F8">
<img class="figure-thumb" itemprop="thumbnail"
id="article-image-7"
src="https://cdn.ncbi.nlm.nih.gov/pmc/blobs/71d1/4319469/9decec186305/fgene-06-00021-g008.gif"
alt="FIGURE 8" />
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<p> FIGURE 8 </p>
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<div class="figure-caption-contents"><b> Classification of mutations based on… </b></div>
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<strong class="figure-label">
<p> FIGURE 8 </p>
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<div class="figure-caption-contents"><b> Classification of mutations based on structural predictions. </b> The lines between mutation categories connect…</div>
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<figcaption id="figure-caption-7" class="figure-caption-full figure-caption-text" itemtype="http://schema.org/ImageObject" itemprop="description">
<strong class="figure-label">
FIGURE 8
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<div class="figure-caption-contents"><b>Classification of mutations based on structural predictions.</b> The lines between mutation categories connect the compound heterozygous mutations identified in individual cardiomyopathy patients (with red lines), and leukodystrophy patients (with blue lines). The three categories at the top are predicted to have a severe effect on the aminoacylation function of the synthetase, whereas the mutations in the lower category are predicted to retain partial catalytic activity.</div>
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