Crystal structure of the DnaK C-terminus (Dnak-SBD-A)

Experimental Data Snapshot

  • Resolution: 2.36 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.218 

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Structural Basis for the Inhibition of HSP70 and DnaK Chaperones by Small-Molecule Targeting of a C-Terminal Allosteric Pocket.

Leu, J.I.Zhang, P.Murphy, M.E.Marmorstein, R.George, D.L.

(2014) ACS Chem Biol 9: 2508-2516

  • DOI: https://doi.org/10.1021/cb500236y
  • Primary Citation of Related Structures:  
    4R5G, 4R5I, 4R5J, 4R5K, 4R5L

  • PubMed Abstract: 

    The stress-inducible mammalian heat shock protein 70 (HSP70) and its bacterial orthologue DnaK are highly conserved nucleotide binding molecular chaperones. They represent critical regulators of cellular proteostasis, especially during conditions of enhanced stress. Cancer cells rely on HSP70 for survival, and this chaperone represents an attractive new therapeutic target. We have used a structure-activity approach and biophysical methods to characterize a class of inhibitors that bind to a unique allosteric site within the C-terminus of HSP70 and DnaK. Data from X-ray crystallography together with isothermal titration calorimetry, mutagenesis, and cell-based assays indicate that these inhibitors bind to a previously unappreciated allosteric pocket formed within the non-ATP-bound protein state. Moreover, binding of inhibitor alters the local protein conformation, resulting in reduced chaperone-client interactions and impairment of proteostasis. Our findings thereby provide a new chemical scaffold and target platform for both HSP70 and DnaK; these will be important tools with which to interrogate chaperone function and to aid ongoing efforts to optimize potency and efficacy in developing modulators of these chaperones for therapeutic use.

  • Organizational Affiliation

    Department of Genetics, ‡Department of Biochemistry & Biophysics, Abramson Family Cancer Research Institute, Perelman School of Medicine, and §Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chaperone protein DnaK
A, B, C, D
228Escherichia coli K-12Mutation(s): 0 
Gene Names: dnaKgroPgrpFsegb0014JW0013
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
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.36 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.218 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.658α = 102.12
b = 69.412β = 104.2
c = 75.771γ = 92.96
Software Package:
Software NamePurpose
CBASSdata collection
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: 2014-09-10
    Type: Initial release
  • Version 1.1: 2014-12-03
    Changes: Database references
  • Version 1.2: 2024-02-28
    Changes: Data collection, Database references, Derived calculations