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Mutant LexA proteins with specific defects in autodigestion.

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Mutant LexA proteins with specific defects in autodigestion.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Shepley, D. P. Little, J. W.
Description	Author Affiliation: Shepley DP ( Department of Biochemistry, University of Arizona, Tucson 85721, USA.);
Abstract	In self-processing biochemical reactions, a protein or RNA molecule specifically modifies its own structure. Many such reactions are regulated in response to the needs of the cell by an interaction with another effector molecule. In the system we study here, specific cleavage of the Escherichia coli LexA repressor, LexA cleaves itself in vitro at a slow rate, but in vivo cleavage requires interaction with an activated form of RecA protein. RecA acts indirectly as a coprotease to stimulate LexA autodigestion. We describe here a new class of lexA mutants, lexA (Adg-; for autodigestion-defective) mutants, termed Adg- for brevity. Adg- mutants specifically interfered with the ability of LexA to autodigest but left intact its ability to undergo RecA-mediated cleavage. The data are consistent with a conformational model in which RecA favors a reactive conformation capable of undergoing cleavage. To our knowledge, this is the first example of a mutation in a regulated self-processing reaction that impairs the rate of self-processing without markedly affecting the stimulated reaction. Had wild-type lexA carried such a substitution, discovery of its self-processing would have been difficult; we suggest that, in other systems, a slow rate of self-processing has prevented recognition that a reaction is of this nature.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	21
Volume Number	93
Language	English
Publisher	National Academy of Sciences
Publisher Date	1996-12-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Bacterial Proteins Chemistry Metabolism Escherichia Coli Mutagenesis, Site-Directed Serine Endopeptidases Amino Acid Sequence Biosynthesis Binding Sites Cloning, Molecular Genetics Kinetics Plasmids Point Mutation Recombinant Proteins Repressor Proteins Research Support, U.S. Gov't, Non-P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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