Crystal structure of human Hsp70 NBD in the ADP-bound and Mg ion-free state

Experimental Data Snapshot

  • Resolution: 1.58 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 

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Biochemical and structural studies on the high affinity of Hsp70 for ADP.

Arakawa, A.Handa, N.Shirouzu, M.Yokoyama, S.

(2011) Protein Sci 20: 1367-1379

  • DOI: https://doi.org/10.1002/pro.663
  • Primary Citation of Related Structures:  
    3ATU, 3ATV, 3AY9

  • PubMed Abstract: 

    The molecular chaperone 70-kDa heat shock protein (Hsp70) is driven by ATP hydrolysis and ADP-ATP exchange. ADP dissociation from Hsp70 is reportedly slow in the presence of inorganic phosphate (P(i) ). In this study, we investigated the interaction of Hsp70 and its nucleotide-binding domain (NBD) with ADP in detail, by isothermal titration calorimetry measurements and found that Mg(2+) ion dramatically elevates the affinity of Hsp70 for ADP. On the other hand, P(i) increased the affinity in the presence of Mg(2+) ion, but not in its absence. Thus, P(i) enhances the effect of the Mg(2+) ion on the ADP binding. Next, we determined the crystal structures of the ADP-bound NBD with and without Mg(2+) ion. As compared with the Mg(2+) ion-free structure, the ADP- and Mg(2+) ion-bound NBD contains one Mg(2+) ion, which is coordinated with the β-phosphate group of ADP and associates with Asp10, Glu175, and Asp199, through four water molecules. The Mg(2+) ion is also coordinated with one P(i) molecule, which interacts with Lys71, Glu175, and Thr204. In fact, the mutations of Asp10 and Asp199 reduced the affinity of the NBD for ADP, in both the presence and the absence of P(i) . Therefore, the Mg(2+) ion-mediated network, including the P(i) and water molecules, increases the affinity of Hsp70 for ADP, and thus the dissociation of ADP is slow. In ADP-ATP exchange, the slow ADP dissociation might be rate-limiting. However, the nucleotide-exchange factors actually enhance ADP release by disrupting the Mg(2+) ion-mediated network.

  • Organizational Affiliation

    Department of Biophysics and Biochemistry, Graduate School of Science, The University of Tokyo, Tokyo, Japan.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Heat shock 70 kDa protein 1A/1B392Homo sapiensMutation(s): 0 
Gene Names: Hsp70HSPA1HSPA1AHSPA1B
UniProt & NIH Common Fund Data Resources
Find proteins for P0DMV8 (Homo sapiens)
Explore P0DMV8 
Go to UniProtKB:  P0DMV8
GTEx:  ENSG00000204389 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DMV8
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
ADP PDBBind:  3ATV Kd: 4610 (nM) from 1 assay(s)
BindingDB:  3ATV Kd: min: 320, max: 324 (nM) from 2 assay(s)
IC50: 280 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 1.58 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.187 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.861α = 90
b = 63.135β = 90
c = 144.22γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-12-28
    Type: Initial release