4JNF

Allosteric opening of the polypeptide-binding site when an Hsp70 binds ATP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.62 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.192 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Allosteric opening of the polypeptide-binding site when an Hsp70 binds ATP.

Qi, R.Sarbeng, E.B.Liu, Q.Le, K.Q.Xu, X.Xu, H.Yang, J.Wong, J.L.Vorvis, C.Hendrickson, W.A.Zhou, L.Liu, Q.

(2013) Nat Struct Mol Biol 20: 900-907

  • DOI: https://doi.org/10.1038/nsmb.2583
  • Primary Citation of Related Structures:  
    4JN4, 4JNE, 4JNF

  • PubMed Abstract: 

    The 70-kilodalton (kDa) heat-shock proteins (Hsp70s) are ubiquitous molecular chaperones essential for cellular protein folding and proteostasis. Each Hsp70 has two functional domains: a nucleotide-binding domain (NBD), which binds and hydrolyzes ATP, and a substrate-binding domain (SBD), which binds extended polypeptides. NBD and SBD interact little when in the presence of ADP; however, ATP binding allosterically couples the polypeptide- and ATP-binding sites. ATP binding promotes polypeptide release; polypeptide rebinding stimulates ATP hydrolysis. This allosteric coupling is poorly understood. Here we present the crystal structure of an intact ATP-bound Hsp70 from Escherichia coli at 1.96-Å resolution. The ATP-bound NBD adopts a unique conformation, forming extensive interfaces with an SBD that has changed radically, having its α-helical lid displaced and the polypeptide-binding channel of its β-subdomain restructured. These conformational changes, together with our biochemical assays, provide a structural explanation for allosteric coupling in Hsp70 activity.


  • Organizational Affiliation

    Department of Physiology and Biophysics, Virginia Commonwealth University, Richmond, Virginia, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Hsp70 CHAPERONE DnaK221Escherichia coli K-12Mutation(s): 3 
UniProt
Find proteins for P0A6Y8 (Escherichia coli (strain K12))
Explore P0A6Y8 
Go to UniProtKB:  P0A6Y8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0A6Y8
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.62 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.191 
  • R-Value Observed: 0.192 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.98α = 90
b = 66.98β = 90
c = 128.759γ = 120
Software Package:
Software NamePurpose
MAR345data collection
MOLREPphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-05-29
    Type: Initial release
  • Version 1.1: 2013-07-10
    Changes: Database references
  • Version 1.2: 2013-08-07
    Changes: Database references
  • Version 1.3: 2017-11-15
    Changes: Refinement description
  • Version 1.4: 2023-09-20
    Changes: Data collection, Database references, Refinement description