NDLI: ATP hydrolysis-dependent protease activity of the lon (capR) protein of Escherichia coli K-12.

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ATP hydrolysis-dependent protease activity of the lon (capR) protein of Escherichia coli K-12.

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ATP hydrolysis-dependent protease activity of the lon (capR) protein of Escherichia coli K-12.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Henderson, G. W. Markovitz, A. Charette, M. F.
Abstract	Mutations in the lon (capR) gene result in multiple phenotypes, one of which is the failure to degrade abnormal and normal proteins (Deg-). Previous work with partially purified preparations showed that the lon (capR) gene product is a 94,000-dalton polypeptide with an affinity for nucleic acids. The lon (capR) protein has now been highly purified and is demonstrated to have an ATP-dependent protease activity. The enzyme hydrolyzed 3H-labeled alpha-casein into trichloroacetic acid-soluble forms in Tris buffer containing Mg2+ and ATP. The reaction has a pH optimum of 8.5 and ATP was the preferred nucleotide. CTP and UTP could substitute for ATP (75% and 67%, respectively) but GTP, ADP, AMP, cyclic AMP, and PPi could not. Proteolysis by the lon (capR) protein required ATP hydrolysis. Nonhydrolyzable analogs of ATP and CTP did not promote casein cleavage. When low concentrations of ATP were used, proteolysis stopped as the ATP pool was depleted. Casein stimulated lon (capR) ATPase activity, and the products were ADP and inorganic phosphate in equimolar amounts. No protein kinase activity was detected. The DNA-binding activity, present in partially pure preparations, was retained in the purified protein. The gene product purified from a lon nonsense mutant that exhibits the Deg- phenotype (capR9), lacked both the ATP-dependent protease and ATPase activities, though it retained DNA-binding activity. Absence of an ATP-dependent protease activity could account for many of the pleiotropic effects observed in lon mutants.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	8
Volume Number	78
Language	English
Publisher	National Academy of Sciences
Publisher Date	1981-01-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Endopeptidases Metabolism Escherichia Coli Proteins Escherichia Coli Enzymology Heat-Shock Proteins Peptide Hydrolases Protease La Serine Endopeptidases ATP-Dependent Proteases Adenosine Triphosphatases Adenosine Triphosphate Carrier Proteins Caseins Cell Division DNA DNA-Binding Proteins Genes Genes, Bacterial Hydrogen-Ion Concentration Mutation Genetics Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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