1KAY | pdb_00001kay

70KD HEAT SHOCK COGNATE PROTEIN ATPASE DOMAIN, K71A MUTANT

• PDB DOI: https://doi.org/10.2210/pdb1KAY/pdb

• Classification: HYDROLASE
• Organism(s): Bos taurus
• Mutation(s): Yes 


• Deposited: 1996-04-15 Released: 1996-11-08 
• Deposition Author(s): O'Brien, M.C., Flaherty, K.M., Mckay, D.B.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 
  0.243 (Depositor) 
• R-Value Work: 
  0.204 (Depositor) 
• R-Value Observed: 
  0.204 (Depositor) 

Literature

Lysine 71 of the chaperone protein Hsc70 Is essential for ATP hydrolysis.

O'Brien, M.C., Flaherty, K.M., McKay, D.B.

(1996) J Biological Chem 271: 15874-15878

• PubMed: 8663302 
• DOI: https://doi.org/10.1074/jbc.271.27.15874
• Primary Citation Related Structures: 
  1KAX, 1KAY, 1KAZ


• PubMed Abstract: 
  

  It has been proposed that lysine 71 of the bovine 70-kDa heat shock cognate protein might participate in catalysis of ATP hydrolysis by stabilizing an H2O molecule or an OH- ion for nucleophilic attack on the gamma-phosphate of the nucleotide (Flaherty, K. M., Wilbanks, S. M., DeLuca-Flaherty, C., and McKay, D. B. (1994) J. Biol. Chem. 12899-12907; Wilbanks, S. M., DeLuca-Flaherty, C., and McKay, D. B. (1994) J. Biol. Chem. 269, 12893-12898). To test this hypothesis, lysine 71 of the ATPase fragment 70-kDa heat shock cognate protein has been mutated to glutamic acid, methionine, and alanine; and the kinetic and structural properties of the mutant proteins have been determined. All three mutant proteins are devoid of measurable ATP hydrolysis activity. Crystal structures of the mutant proteins have been determined to a resolution of 1.7 A; all three have ATP in the nucleotide binding site. These data identify lysine 71 as a residue that is essential for chemical hydrolysis of ATP.

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Organizational Affiliation: 
• Department of Structural Biology, Stanford University School of Medicine, Stanford, California 94305, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 42.66 kDa 
• Atom Count: 3,369 
• Modeled Residue Count: 378 
• Deposited Residue Count: 381 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
70KD HEAT SHOCK COGNATE PROTEIN	A	381	Bos taurus	Mutation(s): 1  EC: 3.6.1.3 (PDB Primary Data), 3.6.4.10 (UniProt)
UniProt
Find proteins for P19120 (Bos taurus) Explore P19120  Go to UniProtKB:  P19120

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ATP	H [auth A]	ADENOSINE-5'-TRIPHOSPHATE C10 H16 N5 O13 P3 ZKHQWZAMYRWXGA-KQYNXXCUSA-N
K	E [auth A], F [auth A], G [auth A]	POTASSIUM ION K NPYPAHLBTDXSSS-UHFFFAOYSA-N
CL	C [auth A], D [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M
MG	B [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free:  0.243 (Depositor) 
• R-Value Work:  0.204 (Depositor) 
• R-Value Observed: 0.204 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 143.9	α = 90
b = 64.6	β = 90
c = 46.2	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1996-11-08 
Deposition Author(s): O'Brien, M.C., Flaherty, K.M., Mckay, D.B.

Revision History  

• Version 1.0: 1996-11-08
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2021-11-03
  Changes: Database references, Derived calculations, Other
• Version 1.4: 2024-02-07
  Changes: Data collection