4JNF

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.621 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.3 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: 10.1038/nsmb.2583
  • Primary Citation of Related Structures:  

  • 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 ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Hsp70 CHAPERONE DnaK
A
221Escherichia coli (strain K12)Mutation(s): 3 
Gene Names: dnaK (groP, grpF, seg)
Find proteins for P0A6Y8 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A6Y8
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.621 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.191 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 66.980α = 90.00
b = 66.980β = 90.00
c = 128.759γ = 120.00
Software Package:
Software NamePurpose
MOLREPphasing
PHENIXrefinement
HKL-2000data scaling
HKL-2000data reduction
MAR345data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-05-29
    Type: Initial release
  • Version 1.1: 2013-07-10
    Type: Database references
  • Version 1.2: 2013-08-07
    Type: Database references
  • Version 1.3: 2017-11-15
    Type: Refinement description