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Edinach, E.* ; Giannouli, A.* ; Dalaloyan, A.* ; Oranges, M.* ; Banik, D.* ; Yardeni, E.H.* ; Elimelech, A. ; Sattler, M. ; Ntermanakis, E.* ; Su, X.C.* ; Goldfarb, D.*

Beyond a passive Tether: Structural insights into the disordered tail of Hsp90.

J. Am. Chem. Soc. 148, 16469-16481 (2026)
Verlagsversion Forschungsdaten DOI PMC
Open Access Hybrid
Creative Commons Lizenzvertrag
The molecular chaperone Hsp90 is an abundant and essential homodimer that supports the stability and folding of hundreds of client proteins in cells. Its C-terminal domain (CTD) mediates dimerization and serves as a docking site for cochaperones bearing tetratricopeptide repeat (TPR) domains, which recognize the conserved MEEVD motif located at the end of an intrinsically disordered CTD tail. Despite its conservation, the structural role of this tail remains poorly understood. We investigated the conformational behavior of the yeast Hsp90 (yHsp90) CTD tail and its response to the binding of the TPR-containing PPIase cochaperone Cpr6. Using site-directed spin labeling with nitroxide and Gd(III) labels, we examined full-length yHsp90 (FL), isolated CTD (IsoC), and tail-truncated variants by double electron-electron resonance (DEER) and EPR spectroscopy. The CTD tails in IsoC and FL adopted distinct conformational ensembles, attributed to intramolecular interactions with the middle domain in FL. Cpr6 binding abolished these differences, indicating disruption of intramolecular tail contacts. In IsoC, the tail also stabilized an additional CTD conformation near the dimer interface that was absent in FL and was lost upon tail truncation, consistent with tail-CTD interactions observed by NMR. This population was reduced upon Cpr6 binding, shifting the IsoC conformational distribution toward that of FL. Additionally, this population was reduced in cellular environments and mimics. Together, our results demonstrate that the disordered CTD tail is an active structural element that modulates both its own conformational ensemble and CTD architecture, highlighting its potential functional relevance in the Hsp90 chaperone cycle.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Comprehensive Software Package; Conformational Dynamics; Saccharomyces-cerevisiae; Peldor Spectroscopy; Crystal-structure; Band Inversion; Binding; Reveals; Dimerization; Cpr6
ISSN (print) / ISBN 0002-7863
e-ISSN 1520-5126
Zeitschrift Journal of the American Chemical Society
Quellenangaben Band: 148, Heft: 15, Seiten: 16469-16481 Artikelnummer: , Supplement: ,
Verlag American Chemical Society (ACS)
Verlagsort 1155 16th St, Nw, Washington, Dc 20036 Usa
Begutachtungsstatus Peer reviewed
Institut(e) Institute of Structural Biology (STB)
Förderungen National Natural Science Foundation of China (NSFC)
Israel Science Foundation
Weizmann Institute of Science
Harold Perlman Family