nih-gov/researchfestival.nih.gov/2015/posters/dark-state-groel-direct-demonstration-intrinsic-foldaseunfoldase-activity
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<title>The Dark State of GroEL: Direct Demonstration of Intrinsic Foldase/Unfoldase Activity by Solution NMR | NIH Research Festival</title>
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<article><div class="banner banner--gray banner--compact" style="--banner-background-image: url('/sites/default/files/media/image/2021-03/2015.jpg');--banner-background-focus: 50% 50%"><div class="banner__wrapper"><div class="banner__container"><h2 class="banner__heading">NIH Research Festival</h2><div class="banner__content"><p><strong><time datetime="2015-09-16">September 16</time> <time datetime="2015-09-18">18, 2015</time></strong></p></div></div></div></div></article>
<div class="section"><div data-drupal-messages-fallback class="hidden"></div></div><main role="main"><div id="main-content" tabindex="-1"></div><div class="section"><div class="content-sidebar"><div class="content-sidebar__main"><div class="content-sidebar__main-content"><div id="block-mainpagecontent-2"><article><h1>The Dark State of GroEL: Direct Demonstration of Intrinsic Foldase/Unfoldase Activity by Solution NMR</h1><div class="schedule"><div class="schedule__label"><div class="schedule__label-text"><time datetime="2015-09-18">Friday, September 18, 2015</time>
Poster Session IV
</div></div><div class="schedule__content"><div class="schedule__item"><div class="schedule__time">12:00 1:30 p.m.</div><div class="schedule__description"><p><strong>FAES Terrace</strong></p></div><div class="schedule__description"><p><strong>NIDDK</strong></p></div><div class="schedule__description"><p><strong>BIOENG-16</strong></p></div></div></div></div><p><strong>FARE Award Winner</strong></p><h2>Authors</h2><ul><li>DS Libich</li><li>V Tugarinov</li><li>GM Clore</li></ul><h2>Abstract</h2><p>The chaperonins, a ubiquitous subclass of molecular chaperones, are barrel-shaped, multisubunit assemblies that assist protein folding in an ATP-dependent manner. Although the encapsulation mechanism and accompanying allosteric transitions driven by ATP have been extensively studied, the details of how chaperonins fold proteins remain elusive. Further, encapsulation does not appear to be an absolute requirement for successful re/folding. Here we take advantage of a monomeric, non-aggregating, well-defined system - a triple mutant of the Fyn SH3 domain that exists in dynamic equilibrium between the major native state and a sparsely-populated folding intermediate - to directly demonstrate, using NMR relaxation-based methods, the ability of apo GroEL to accelerate the interconversion between these two states by almost three orders of magnitude. Simultaneous analysis of lifetime line-broadening, Dark state Exchange Saturation Transfer (DEST) and Carr-Purcell-Meinboom-Gill (CPMG) relaxation dispersion data permitted us to determine the catalytic rate constants and ascertain the location of the GroEL binding site on the folding intermediate under conditions where the population of GroEL-bound native and intermediate states is less than 1%. Further, GroEL foldase/unfoldase activity is modulated by SH3 deuteration indicating that catalysis of the exchange reaction between folded and intermediate states involved direct interaction of the substrate with the walls of the GroEL chambers. These results provide a basis for how chaperonins, in the absence of co-factors and encapsulation, may be able to passively protect the cell from the deleterious effects of misfolded protein accumulation.</p><p><strong>Scientific Focus Area</strong>: Biomedical Engineering and Biophysics</p><p class="updated"><small>This page was last updated on Friday, March 26, 2021</small></p></article>
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