NDLI: Mutations in the Escherichia coli UvrB ATPase motif compromise excision repair capacity.

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Mutations in the Escherichia coli UvrB ATPase motif compromise excision repair capacity.

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Mutations in the Escherichia coli UvrB ATPase motif compromise excision repair capacity.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Grossman, L. Seeley, T. W.
Description	Author Affiliation: Seeley TW ( Department of Biochemistry, School of Hygiene and Public Health, Johns Hopkins University, Baltimore, MD 21205.);
Abstract	The Escherichia coli UvrB protein possesses an amino acid sequence motif common to many ATPases. The role of this motif in UvrB has been investigated by site-directed mutagenesis. Three UvrB mutants, with amino acid replacements at lysine-45, failed to confer UV resistance when tested in the UV-sensitive strain N364 (delta uvrB), while five other mutants constructed near this region of UvrB confer wild-type levels of UV resistance. Because even the conservative substitution of arginine for lysine-45 in UvrB results in failure to confer UV resistance, we believe we have identified an amino acid side chain in UvrB essential to nucleotide excision repair in E. coli. The properties of two purified mutant UvrB proteins, lysine-45 to alanine (K45A) and asparagine-51 to alanine (N51A), were analyzed in vitro. While the K45A mutant is fully defective in incision of UV-irradiated DNA, K45A is capable of interaction with UvrA in forming an ATP-dependent nucleoprotein complex. The K45A mutant, however, fails to activate the characteristic increase in ATPase activity observed with the wild-type UvrB in the presence of UvrA and DNA. From these results we conclude that there is a second nucleotide-dependent step in incision following initial complex formation, which is defective in the K45A mutant. This experimental approach may prove of general applicability in the study of function and mechanism of other ATPase motif proteins.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	17
Volume Number	86
Language	English
Publisher	National Academy of Sciences
Publisher Date	1989-10-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Bacterial Proteins Genetics DNA Helicases DNA Repair Escherichia Coli Proteins Escherichia Coli Mutation Amino Acid Sequence Metabolism Cloning, Molecular Dose-Response Relationship, Radiation Enzymology Radiation Effects Kinetics Molecular Sequence Data Oligonucleotide Probes Ultraviolet Rays Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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