1QQO

E175S MUTANT OF BOVINE 70 KILODALTON HEAT SHOCK PROTEIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.203 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Mapping the role of active site residues for transducing an ATP-induced conformational change in the bovine 70-kDa heat shock cognate protein.

Johnson, E.R.McKay, D.B.

(1999) Biochemistry 38: 10823-10830

  • DOI: 10.1021/bi990816g
  • Primary Citation of Related Structures:  1QQM, 1QQN

  • PubMed Abstract: 
  • ATP binding induces a conformational change in 70-kDa heat shock proteins (Hsp70s) that facilitates release of bound polypeptides. Using the bovine heat shock cognate protein (Hsc70) as a representative of the Hsp70 family, we have characterized the ...

    ATP binding induces a conformational change in 70-kDa heat shock proteins (Hsp70s) that facilitates release of bound polypeptides. Using the bovine heat shock cognate protein (Hsc70) as a representative of the Hsp70 family, we have characterized the effect of mutations on the coupling between ATP binding and the nucleotide-induced conformational change. Steady-state solution small-angle X-ray scattering and kinetic fluorescence measurements on a 60-kDa fragment of Hsc70 show that point mutations K71M, E175S, D199S, and D206S in the nucleotide binding cleft impair the ability of ATP to induce a conformational change. A secondary mutation in the peptide binding domain, E543K, "rescues" the ATP-induced transition for three of these mutations (E175S/E543K, D199S/E543K, and D206S/E543K) but not for K71M/E543K. Analysis of kinetics of the ATPase cycle confirm that these effects do not result from unexpectedly rapid ATP hydrolysis or slow ATP binding. Crystallographic structures of E175S, D199S, and D206S mutant ATPase fragment proteins show that the mutations do not perturb the tertiary structure of the protein but do significantly alter the protein-ligand interactions, due in part to an apparent charge compensation effect whereby mutating a (probably) negatively charged carboxyl group to a neutral serine displaces a K+ ion from the nucleotide binding cleft in two out of three cases (E175S and D199S but not D206S).


    Related Citations: 
    • Three-Dimensional Structure of the ATPase Fragment of a 70K Heat-Shock Cognate Protein
      Flaherty, K.M.,Deluca-Flaherty, C.,Mckay, D.B.
      (1990) Nature 346: 623
    • Structural Basis of the 70-Kilodalton Heat Shock Cognate Protein ATP Hydrolytic Activity
      Flaherty, K.M.,Wilbanks, S.M.,Deluca-Flaherty, C.,Mckay, D.B.
      (1994) J.Biol.Chem. 269: 12899


    Organizational Affiliation

    Department of Structural Biology, Stanford University School of Medicine, California 94305-5126, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HYDROLASE (ACTING ON ACID ANHYDRIDES)
A
378Bos taurusGene Names: HSPA8 (HSC70)
Find proteins for P19120 (Bos taurus)
Go to Gene View: HSPA8
Go to UniProtKB:  P19120
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download SDF File 
Download CCD File 
A
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
ADP
Query on ADP

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Download CCD File 
A
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
CL
Query on CL

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Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
ADPIC50: 280 nM (99) BINDINGDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.203 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 143.756α = 90.00
b = 64.029β = 90.00
c = 46.406γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSphasing
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-09-15
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-04
    Type: Refinement description