7KRT

Restraining state of a truncated Hsp70 DnaK


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.79 Å
  • R-Value Free: 0.308 
  • R-Value Work: 0.279 
  • R-Value Observed: 0.280 

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Literature

Conformational equilibria in allosteric control of Hsp70 chaperones.

Wang, W.Liu, Q.Liu, Q.Hendrickson, W.A.

(2021) Mol Cell 

  • DOI: 10.1016/j.molcel.2021.07.039
  • Primary Citation of Related Structures:  
    7KO2, 7KRV, 7KRW, 7KRT, 7KRU

  • PubMed Abstract: 
  • Heat-shock proteins of 70 kDa (Hsp70s) are vital for all life and are 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 ...

    Heat-shock proteins of 70 kDa (Hsp70s) are vital for all life and are 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, Hsp70 R -ATP, restricts ATP hydrolysis and binds peptides poorly, whereas a stimulating state, Hsp70 S -ATP, hydrolyzes ATP rapidly and has high intrinsic substrate affinity but rapid binding kinetics. 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.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biophysics, Columbia University, New York, NY 10032, USA; Department of Physiology and Cellular Biophysics, Columbia University, New York, NY 10032, USA. Electronic address: wah2@cumc.columbia.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Chaperone protein DnaKA, B, C, D600Escherichia coli K-12Mutation(s): 3 
Gene Names: dnaKFAZ83_07380
UniProt
Find proteins for A0A6D2W465 (Escherichia coli (strain K12))
Explore A0A6D2W465 
Go to UniProtKB:  A0A6D2W465
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.79 Å
  • R-Value Free: 0.308 
  • R-Value Work: 0.279 
  • R-Value Observed: 0.280 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 77.469α = 90
b = 199.529β = 93.75
c = 94.231γ = 90
Software Package:
Software NamePurpose
Aimlessdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM107462

Revision History  (Full details and data files)

  • Version 1.0: 2021-09-15
    Type: Initial release