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<p class="publishdate"><span class="tag-term">News Release</span></p><p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2016-05-26T12:00:00-04:00" class="date-display-single">Thursday, May 26, 2016</span></p><h1>NIH study visualizes proteins involved in cancer cell metabolism</h1><p class="subtitle">
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Cryo-EM methods can determine structures of small proteins bound to potential drug candidates.</p><div class="featured-media"><div class="ds-1col file file-image file-image-jpeg view-mode-featured_media clearfix">
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<picture title="Improving resolutions in atomic detail of proteins and drug binding sites.">
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<source srcset="https://www.nih.gov/sites/default/files/styles/featured_media_breakpoint-large-extra/public/news-events/news-releases/2016/20160626-nci.jpg?itok=8rPFOYzM&timestamp=1464364766 1x" media="screen and (min-width: 1100px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/featured_media_breakpoint-large/public/news-events/news-releases/2016/20160626-nci.jpg?itok=dkrkgNen&timestamp=1464364766 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/featured_media_breakpoint-medium/public/news-events/news-releases/2016/20160626-nci.jpg?itok=rOFnY9h8&timestamp=1464364766 1x" media="screen and (min-width: 800px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/featured_media_breakpoint-small/public/news-events/news-releases/2016/20160626-nci.jpg?itok=eNFkXgOv&timestamp=1464364766 1x" media="screen and (min-width: 480px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/featured_media__breakpoint-tiny_/public/news-events/news-releases/2016/20160626-nci.jpg?itok=9Ik_dGu6&timestamp=1464364766 1x" media="screen and (min-width: 0)" />
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<img src="https://www.nih.gov/sites/default/files/styles/featured_media_breakpoint-medium/public/news-events/news-releases/2016/20160626-nci.jpg?itok=rOFnY9h8&timestamp=1464364766" alt="Improving resolutions in atomic detail of proteins and drug binding sites." title="Improving resolutions in atomic detail of proteins and drug binding sites." />
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</picture><span class="caption">Rapid advances in cryo-EM technology, from left to right, show improving resolutions in atomic detail of proteins and drug binding sites.</span><span class="credit">National Cancer Institute</span></div>
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</div><p>Scientists using a technology called cryo-EM (cryo-electron microscopy) have broken through a technological barrier in visualizing proteins with an approach that may have an impact on drug discovery and development. They were able to capture images of glutamate dehydrogenase, an enzyme found in cells, at a resolution of 1.8 angstroms, a level of detail at which the structure of the central parts of the enzyme could be visualized in atomic detail. The scientists from the National Cancer Institute (NCI), part of the National Institutes of Health, and their colleagues also reported achieving another major milestone, by showing that the shapes of cancer target proteins too small to be considered within the reach of current cryo-EM capabilities can now be determined at high resolution.</p>
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<p>The research team was led by NCI’s Sriram Subramaniam, Ph.D., with contributions from scientists at the National Center for Advancing Translational Sciences (NCATS), also part of NIH. The findings appeared online May 26, 2016, in Cell.</p>
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<p>“These advances demonstrate a real-life scenario in which drug developers now could potentially use cryo-EM to tweak drugs by actually observing the effects of varying drug structure — much like an explorer mapping the shoreline to find the best place to dock a boat — and alter its activity for a therapeutic effect,” said Doug Lowy, M.D., acting director, NCI.</p>
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<p>Both discoveries have the potential to have an impact on drug discovery and development. Cryo-EM imaging enables analysis of structures of target proteins bound to drug candidates without first needing a step to coax the proteins to form ordered arrays. These arrays were needed for the traditional method of structure determination using X-ray crystallography, a powerful technique that has served researchers well for more than a half century. However, not all proteins can be crystallized easily, and those that do crystallize may not display the same shape that is present in their natural environment, either since the protein shape can be modified by crystallization additives or by the contacts that form between neighboring proteins within the crystal lattice.</p>
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<p>“It is exciting to be able to use cryo-EM to visualize structures of complexes of potential drug candidates at such a high level of detail,” said Subramaniam. “The fact that we can obtain structures of small cancer target proteins bound to drug candidates without needing to form 3D crystals could revolutionize and accelerate the drug discovery process.”</p>
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<p>“It is exciting to be able to use cryo-EM to visualize structures of complexes of potential drug candidates at such a high level of detail.”</p>
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<p class="caption">—<strong>Sriram Subramaniam, Ph.D.,</strong> National Caner Institute</p>
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<p>Two of the small proteins the researchers imaged in this new study, isocitrate dehydrogenase (IDH1) and lactate dehydrogenase (LDH), are active targets for cancer drug development. Mutations in the genes that code for these proteins are common in several types of cancer. Thus, imaging the surfaces of these proteins in detail can help scientists identify molecules that will bind to them and aid in turning the protein activity off.</p>
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<p>In publications in the journal Science last year and this year, Subramaniam and his team reported resolutions of 2.2 angstroms and 2.3 angstroms in cryo-EM with larger proteins, including a complex of a cancer target protein with a small molecule inhibitor. Of note, the journal Nature Methods deemed cryo-EM as the "Method of the Year" in January 2016. “<a href="http://www.cancer.gov/news-events/press-releases/2016/cryo-electron-microscopy">Our earlier work showed what was technically possible</a>,” Subramaniam said. “This latest advance is a delivery of that promise for small cancer target proteins.” For more information on cryo-EM, go to <a href="http://electron.nci.nih.gov">http://electron.nci.nih.gov</a>.</p>
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<p><strong>The National Cancer Institute</strong> leads the National Cancer Program and the NIH’s efforts to dramatically reduce the prevalence of cancer and improve the lives of cancer patients and their families, through research into prevention and cancer biology, the development of new interventions, and the training and mentoring of new researchers. For more information about cancer, please visit the NCI website at <a href="http://www.cancer.gov/">http://www.cancer.gov</a> or call NCI's Cancer Information Service at 1-800-4-CANCER.</p>
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<p><strong>The National Center for Advancing Translational Sciences (NCATS)</strong> is a distinctly different entity in the research ecosystem. Rather than targeting a particular disease or fundamental science, NCATS focuses on what is common across diseases and the translational process. The Center emphasizes innovation and deliverables, relying on the power of data and new technologies to develop, demonstrate and disseminate improvements in translational science that bring about tangible improvements in human health. For more information, visit <a href="http://www.ncats.nih.gov/">http://www.ncats.nih.gov</a>.</p>
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<h3>Reference</h3>Merk A, Bartesaghi A, Banerjee S, Falconieri V, Rao P, Davis M, Pragani R, Boxer M., Earl LA, Milne, JLS, Subramaniam, S. Breaking cryo-EM resolution barriers to facilitate drug discovery. Cell. Online May 26, 2016. In print June 16, 2016. DOI:10.1016/j.cell.2016.05.040</div>
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