1HPM

HOW POTASSIUM AFFECTS THE ACTIVITY OF THE MOLECULAR CHAPERONE HSC70. II. POTASSIUM BINDS SPECIFICALLY IN THE ATPASE ACTIVE SITE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Work: 0.205 
  • R-Value Observed: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

How potassium affects the activity of the molecular chaperone Hsc70. II. Potassium binds specifically in the ATPase active site.

Wilbanks, S.M.McKay, D.B.

(1995) J Biol Chem 270: 2251-2257

  • DOI: 10.1074/jbc.270.5.2251
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Crystallographic anomalous scattering from potassium at 1.7 A resolution reveals two monovalent ions that interact with MgADP and P(i) in the nucleotide binding cleft of wild-type recombinant bovine Hsc70 ATPase fragment. K+ at site 1 interacts with ...

    Crystallographic anomalous scattering from potassium at 1.7 A resolution reveals two monovalent ions that interact with MgADP and P(i) in the nucleotide binding cleft of wild-type recombinant bovine Hsc70 ATPase fragment. K+ at site 1 interacts with oxygens of the beta-phosphate of ADP, whereas K+ at site 2 interacts with an oxygen of P(i). Both K+ ions also interact with specific H2O molecules in the first hydration shell of the octahedrally coordinated Mg2+ ion and with specific protein ligands. In crystals that have Na+ present, K+ is replaced by a Na+ ion at site 1 and by a Na(+)-H2O pair at site 2. The K+ ions are positioned where they could stabilize binding of a beta,gamma-bidentate MgATP complex with Hsc70, as well as a transition state during ATP hydrolysis, suggesting that monovalent ions act as specific metal cofactors in the ATPase reaction of Hsc70.


    Related Citations: 
    • How Potassium Affects the Activity of the Molecular Chaperone Hsc70. I. Potassium is Required for Optimal ATPase Activity
      O'Brien, M.C., Mckay, D.B.
      (1995) J Biol Chem 270: 2247
    • 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
    • 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

    Organizational Affiliation

    Beckman Laboratories for Structural Biology, Stanford University School of Medicine, California 94305.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
44K ATPASE FRAGMENT (N-TERMINAL) OF 7O kD HEAT-SHOCK COGNATE PROTEINA386Bos taurusMutation(s): 0 
Gene Names: HSPA8HSC70
EC: 3.6.1.3
Find proteins for P19120 (Bos taurus)
Explore P19120 
Go to UniProtKB:  P19120
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download CCD File 
A
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
PO4
Query on PO4

Download CCD File 
A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
K
Query on K

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A
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

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

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A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
ADPIC50:  280   nM  BindingDB
ADPKd:  320   nM  BindingDB
ADPKd:  324   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Work: 0.205 
  • R-Value Observed: 0.205 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 143.9α = 90
b = 63.7β = 90
c = 46.2γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1995-07-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance