PMID:2531744: Difference between revisions
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Revision as of 13:02, 30 April 2008
Cegielska, A and Georgopoulos, C (1989) Functional domains of the Escherichia coli dnaK heat shock protein as revealed by mutational analysis.J. Biol. Chem. 264:21122-30
| Abstract | The employment of a set of truncated dnaK peptides produced by deletion and insertion mutations in the Escherichia coli dnaK gene allowed us to define regions of the dnaK protein which are involved in particular enzymatic functions. The results obtained suggest that the dnaK polypeptide is organized into at least two distinct functional domains. The highly conserved amino-terminal portion is required for the ATPase activity. The carboxyl-terminal portion, characterized by relatively low similarity among species, is responsible for the autophosphorylating activity. The mutant dnaK protein C[74], which lacks amino acid sequences at the extreme carboxyl-terminal portion of the protein, retains both the ATPase and the autophosphorylating activities. The results obtained with the full-length (70-kDa) dnaK756 protein suggest that the thermolabile defect of the dnaK756 mutation affects directly or indirectly the ATPase active site of the enzyme. The autophosphorylating activity of the dnaK+, dnaK756, and C[74] polypeptides was activated at least 10-fold by the addition of CaCl2. |
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