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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="2012-10-22T00:00:00-04:00" class="date-display-single">October 22, 2012</span></p><div class='syndicate'><h1>Brain Protein Structure Offers Clues for Drug Design</h1><div class="media-float-right"><div class="ds-1col file file-image file-image-jpeg view-mode-floated_media clearfix">
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<picture title="Small neurotensin molecule on the surface of its 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/2012/20121022-structure.jpg?itok=ory2VGY_&timestamp=1435848474 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/2012/20121022-structure.jpg?itok=zdjh4YBR&timestamp=1435848474 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/2012/20121022-structure.jpg?itok=inKiYUwn&timestamp=1435848474 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/2012/20121022-structure.jpg?itok=A_vrTv7K&timestamp=1435848474 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/2012/20121022-structure.jpg?itok=iL56vGqk&timestamp=1435848474 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/2012/20121022-structure.jpg?itok=zdjh4YBR&timestamp=1435848474" alt="Small neurotensin molecule on the surface of its receptor." title="Small neurotensin molecule on the surface of its receptor" />
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</picture><span class="caption">Neurotensin (see arrow) in the binding pocket of NTSR1.</span><span class="credit">Grisshammer and Tate labs, courtesy of Nature.</span></div>
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</div><p>Researchers have published the first highly detailed picture of how neurotensin, a molecule that plays an important role in the brain, interacts with its receptor. The achievement may help scientists design better drugs for certain disorders.</p>
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<p>Neurotensin is a peptide of just 13 amino acids (too short to be called a protein). Because it acts on neurons, or nerve cells, it’s called a neuropeptide. When neurotensin binds its receptor, neurotensin receptor (NTSR1), it initiates a series of reactions. The neuropeptide plays many roles in the brain and also regulates digestive processes in the gut. Previous studies have shown that neurotensin may be involved in Parkinson’s disease, schizophrenia, temperature regulation, pain and cancer cell growth.</p>
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<p>NTSR1 belongs to a class of membrane proteins called G-protein coupled receptors (GPCRs). The molecules that activate these receptors are called ligands. Previous X-ray crystallography studies showed that smaller ligands, such as adrenaline and retinal, bind in the middle of their respective GPCRs and well below the receptor’s surface.</p>
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<p>A research team led by Dr. Reinhard Grisshammer of NIH's National Institute of Neurological Disorders and Stroke (NINDS) set out to use X-ray crystallography to show what NTSR1 looks like in atomic detail when bound to neurotensin. Their study was supported by NINDS, NIH’s National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) and others. The report appeared online on October 10, 2012, in <em>Nature</em>.</p>
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<p>In X-ray crystallography, scientists shoot X-rays at crystallized molecules to determine a molecule’s shape and structure. The X-rays change directions, or diffract, as they pass through the crystals. They then hit a detector where they form a pattern that is used to calculate the atomic structure of the molecule.</p>
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<p>Forming well-diffracting neuropeptide-bound GPCR crystals is very difficult, and the researchers spent many years on the project. A group led by Dr. Christopher Tate at the MRC Laboratory of Molecular Biology in Cambridge, England, collaborated on the project. Tate’s lab used recombinant gene technology to create a stable version of NTSR1. Grisshammer’s lab employed the latest methods to crystallize the receptor bound to a short version of neurotensin.</p>
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<p>The results suggest a novel binding mechanism for a neuropeptide to activate its target GPCR. Neurotensin binds to the outer part of its receptor, just at the receptor surface.</p>
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<p>Atomic structures can guide the way scientists think about how proteins work. This finding may change the way scientists develop drugs targeting similar neuropeptide receptors.</p>
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<p>“The knowledge of how the peptide binds to its receptor should help scientists design better drugs,” Grisshammer says. Nonetheless, he adds, more work will be needed to fully understand the detailed signaling mechanism of this GPCR.</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/april2012/04022012opioid.htm" target="_top">Up Close With Opioid Receptors</a></li><li><a href="http://www.nigms.nih.gov/Research/FeaturedPrograms/PSI/" target="_top">Protein Structure Initiative</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="http://www.ncbi.nlm.nih.gov/pubmed/23051748" target="_blank."> Nature.</a> 2012 Oct 10. doi: 10.1038/nature11558. [Epub ahead of print]. PMID: 23051748.</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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