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Title: Conformational equilibria in allosteric control of Hsp70 chaperones

Journal Article · · Molecular Cell

Heat-shock proteins of 70 kDa (Hsp70s) are vital for all of life, notably important in protein folding. Hsp70s use ATP binding and hydrolysis at a nucleotide-binding domain (NBD) to control the binding and release of client polypeptides at a substrate-binding domain (SBD); however, the mechanistic basis for this allostery has been elusive. Here, we first characterize biochemical properties of selected domain-interface mutants in bacterial Hsp70 DnaK. We then develop a theoretical model for allosteric equilibria among Hsp70 conformational states to explain the observations: a restraining state, Hsp70R-ATP, restricts ATP hydrolysis and binds peptides poorly; whereas a stimulating state, Hsp70S-ATP, hydrolyzes ATP rapidly and has high intrinsic substrate affinity but rapid binding kinetics. Finally, we support this model for allosteric regulation with DnaK structures obtained in the postulated stimulating state S, with biochemical tests of the S-state interface, and with improved peptide-binding-site definition in an R-state structure.

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE; National Institutes of Health (NIH); American Heart Association; Virginia Commonwealth University
Grant/Contract Number:
P30 GM124165; P41 GM103403; SC0012704; R01GM107462; R01GM098592; R21AI140006; 17GRNT33660506
OSTI ID:
1891365
Alternate ID(s):
OSTI ID: 1822850; OSTI ID: 1868837
Report Number(s):
BNL-222181-2021-JAAM; S1097276521006237; PII: S1097276521006237
Journal Information:
Molecular Cell, Journal Name: Molecular Cell Vol. 81 Journal Issue: 19; ISSN 1097-2765
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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