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<h2 class="element-invisible">You are here</h2><div class="breadcrumb"><a href="/">Home</a> » <a href="/news-events">News & Events</a> » <a href="/news-events/nih-research-matters">NIH Research Matters</a></div> <div class="l-region l-region--section-header">
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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2014-08-25T00:00:00-04:00" class="date-display-single">August 25, 2014</span></p><div class='syndicate'><h1>Structural States of a Brain Receptor Revealed</h1><div class="callout callout-with-border"><h3>At a Glance</h3>
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<ul class="spaced">
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<li>Scientists determined the detailed structure and movement of the glutamate receptor, a protein in nerve cells involved in learning, memory, and several diseases.</li>
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<li>The finding provides a better understanding of how the receptor works and may aid in the development of therapies that target the receptor.</li>
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<picture title="Glutamate receptor">
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<!--[if IE 9]><video style="display: none;"><![endif]-->
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2014/20140825-receptor-lowres.jpg?itok=Nhx-BHzI&timestamp=1431528159 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2014/20140825-receptor-lowres.jpg?itok=iFXXqTZY&timestamp=1431528159 1x" media="screen and (min-width: 800px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium-small/public/news-events/research-matters/2014/20140825-receptor-lowres.jpg?itok=tmB4CNyA&timestamp=1431528159 1x" media="screen and (min-width: 600px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-small/public/news-events/research-matters/2014/20140825-receptor-lowres.jpg?itok=HDd3nmKq&timestamp=1431528159 1x" media="screen and (min-width: 480px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2014/20140825-receptor-lowres.jpg?itok=NAr8QAcS&timestamp=1431528159 1x" media="screen and (min-width: 0)" />
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2014/20140825-receptor-lowres.jpg?itok=iFXXqTZY&timestamp=1431528159" alt="Glutamate receptor" title="Glutamate receptor" />
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</picture><span class="caption">Structure of the glutamate receptor, showing the part where glutamate binds outside the cell and the part that spans the cell membrane (between the dotted lines).</span><span class="credit">Image by the authors, courtesy of Nature</span></div>
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</div><p>Cells have receptors on their surface that serve as gatekeepers to transmit signals between the outside and inside. Nerve cells contain glutamate receptors that span the cell membrane. When glutamate binds the receptor on the outside, the receptor changes shape and opens within milliseconds. This allows small substances known as ions to enter the cell. The process is crucial for communication between nerve cells and plays a role in brain development, learning, and memory. Problems with glutamate receptor function are thought to be involved in many disorders, including autism, schizophrenia, depression, Parkinson’s disease, and some types of cancer.</p>
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<p>A team led by Dr. Sriram Subramaniam of NIH’s National Cancer Institute (NCI), in collaboration with colleagues at NIH’s Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) and others, set out to determine the structure of the glutamate receptor as it transitions from its resting state to open to desensitized (reduced response to glutamate) states.</p>
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<p>A structure of one glutamate receptor variant in its resting state had previously been determined by using X-ray crystallography. This technique requires a protein to first be crystallized into a fixed 3-D shape. However, capturing the protein’s multiple states in a crystal is challenging, and could potentially trap subtly misfolded or incorrect structures.</p>
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<p>In findings that appeared online on August 3, 2014, in <em>Nature</em>, the team used an imaging technique called cryo-electron microscopy. This method allowed them to capture high-resolution snapshots of receptors in several transitional stages.</p>
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||
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||
<p>The group analyzed detailed images of different types of glutamate receptors and captured the receptors in different states. They determined that the transition of the protein from the resting to open states involved a corkscrew-like rotational motion within the protein. The shift from open to desensitized states required much larger rearrangements.</p>
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||
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||
<p>“Not in a million years would I have dreamed that a cell receptor would work this way to open and close the gate for ion flow,” Subramaniam says. “It is really satisfying to be able to decipher the inner workings of such an elegant molecular machine.”</p>
|
||
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<p>The scientists note that while several technical hurdles remain, the technique will allow them to analyze the structures of many other proteins, as well as study receptor-drug interactions.</p>
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</div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="http://www.nih.gov/researchmatters/june2014/06092014receptor.htm" target="_top">Structure of Receptor Involved in Brain Disorders</a></li><li><a href="http://www.nih.gov/researchmatters/august2010/08162010bipolar.htm" target="_top">Medication Quickly Lifts Bipolar Depression Symptoms</a></li><li><a href="http://www.nih.gov/researchmatters/april2012/04302012autism2.htm" target="_top">Compound Points to Potential Autism Therapy</a></li><li><a href="http://www.nimh.nih.gov/health/educational-resources/brain-basics/brain-basics.shtml" target="_top">Brain Basics: Know Your Brain</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="http://www.ncbi.nlm.nih.gov/pubmed/25119039">Structural mechanism of glutamate receptor activation and desensitization.</a> Meyerson JR, Kumar J, Chittori S, Rao P, Pierson J, Bartesaghi A, Mayer ML, Subramaniam S. <em>Nature</em>. 2014 Aug 3. doi: 10.1038/nature13603. [Epub ahead of print]. PMID: 25119039.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Cancer Institute (NCI) and Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD).</p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/complete-wiring-map-adult-fruit-fly-brain">Complete wiring map of an adult fruit fly brain</a></p>
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<p><strong><em>NIH Research Matters </em></strong>is a weekly update of NIH research highlights reviewed by NIH’s experts. It's published by the <a href="/institutes-nih/nih-office-director/office-communications-public-liaison">Office of Communications and Public Liaison</a> in the <a href="/institutes-nih/nih-office-director">NIH Office of the Director</a>.</p>
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