Escherichia coli RuvBL268S: a mutant RuvB protein that exhibits wild-type activities in vitro but confers a UV-sensitive ruv phenotype in vivo.

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Ressource 1Download: serval:BIB_BBBDEBA511A3.P001 (619.38 [Ko])
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Version: author
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Serval ID
serval:BIB_BBBDEBA511A3
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Escherichia coli RuvBL268S: a mutant RuvB protein that exhibits wild-type activities in vitro but confers a UV-sensitive ruv phenotype in vivo.
Journal
Nucleic Acids Research
Author(s)
Mézard C., George H., Davies A.A., van Gool A.J., Zerbib D., Stasiak A., West S.C.
ISSN
0305-1048 (Print)
ISSN-L
0305-1048
Publication state
Published
Issued date
03/1999
Volume
27
Number
5
Pages
1275-1282
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Abstract
The RuvABC proteins of Escherichia coli process recombination intermediates during genetic recombination and DNA repair. RuvA and RuvB promote branch migration of Holliday junctions, a process that extends heteroduplex DNA. Together with RuvC, they form a RuvABC complex capable of Holliday junction resolution. Branch migration by RuvAB is mediated by RuvB, a hexameric ring protein that acts as an ATP-driven molecular pump. To gain insight into the mechanism of branch migration, random mutations were introduced into the ruvB gene by PCR and a collection of mutant alleles were obtained. Mutation of leucine 268 to serine resulted in a severe UV-sensitive phenotype, characteristic of a ruv defect. Here, we report a biochemical analysis of the mutant protein RuvBL268S. Unexpectedly, the purified protein is fully active in vitro with regard to its ATPase, DNA binding and DNA unwinding activities. It also promotes efficient branch migration in combination with RuvA, and forms functional RuvABC-Holliday junction resolvase complexes. These results indicate that RuvB may perform some additional, and as yet undefined, function that is necessary for cell survival after UV-irradiation.
Keywords
Adenosine Triphosphatases/metabolism, Amino Acid Sequence, Bacterial Proteins/genetics, Bacterial Proteins/isolation & purification, Base Sequence, DNA/chemistry, DNA/metabolism, DNA Primers, DNA Topoisomerases, Type I/genetics, DNA Topoisomerases, Type I/isolation & purification, Escherichia coli/metabolism, Molecular Sequence Data, Mutagenesis, Nucleic Acid Conformation, Phenotype, Protein Binding, Radiation Tolerance/genetics, Sequence Homology, Amino Acid, Ultraviolet Rays
Pubmed
Web of science
Open Access
Yes
Create date
24/01/2008 11:36
Last modification date
25/09/2019 7:10
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