The three-dimensional structure of the amino-terminal 44K ATPase fragment of the 70K bovine heat-shock cognate protein has been solved to a resolution of 2.2 A. The ATPase fragment has two structural lobes with a deep cleft between them; ATP binds at the base of the cleft ...
The three-dimensional structure of the amino-terminal 44K ATPase fragment of the 70K bovine heat-shock cognate protein has been solved to a resolution of 2.2 A. The ATPase fragment has two structural lobes with a deep cleft between them; ATP binds at the base of the cleft. Surprisingly, the nucleotide-binding 'core' of the ATPase fragment has a tertiary structure similar to that of hexokinase, although the remainder of the structures of the two proteins are completely dissimilar, suggesting that both the phosphotransferase mechanism and the substrate-induced conformational change intrinsic to the hexokinases may be used by the 70K heat shock-related proteins.
Related Citations:
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
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, II. Structure of the Active Site with Adp or ATP Bound to Wild Type and Mutant ATPase Fragment Flaherty, K.M., Wilbanks, S.M., Deluca-Flaherty, C., Mckay, D.B. (1994) J Biol Chem 269: 12899
Organizational Affiliation:
Beckman Laboratories for Structural Biology, Department of Cell Biology, Stanford University School of Medicine, California 94305-5400.
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