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PMID:8428576

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Citation

Lloyd, RG and Sharples, GJ (1993) Dissociation of synthetic Holliday junctions by E. coli RecG protein. EMBO J. 12:17-22

Abstract

The RecG protein of Escherichia coli is needed for normal levels of recombination and for repair of DNA damaged by ultraviolet light, mitomycin C and ionizing radiation. The true extent of its involvement in these processes is masked to a large degree by what appears to be a functional overlap with the products of the three ruv genes. RuvA and RuvB act together to promote branch migration of Holliday junctions, while RuvC catalyses the resolution of these recombination intermediates into viable products by endonuclease cleavage. In this paper, we describe the overproduction and purification of RecG and demonstrate that the overlap extends to the biochemistry. We show that the 76 kDa RecG protein is a DNA-dependent ATPase, like RuvB. Using gel retardation assays we demonstrate that it binds specifically to a synthetic Holliday junction, like RuvA and RuvC. Finally, we show that in the presence of ATP and Mg2+, RecG dissociates these junctions to duplex products, like RuvAB. We suggest that RecG and RuvAB provide alternative activities than can promote branch migration of Holliday junctions in recombination and DNA repair.

Links

PubMed PMC413171

Keywords

Adenosine Triphosphatases/genetics; Adenosine Triphosphatases/isolation & purification; Adenosine Triphosphatases/metabolism; Bacterial Proteins/genetics; Bacterial Proteins/isolation & purification; Bacterial Proteins/metabolism; Base Sequence; DNA/chemical synthesis; DNA/metabolism; DNA Helicases; DNA Repair; Endodeoxyribonucleases; Escherichia coli/genetics; Escherichia coli/metabolism; Escherichia coli Proteins; Genes, Bacterial; Kinetics; Molecular Sequence Data; Oligodeoxyribonucleotides; Plasmids; Recombinant Proteins/isolation & purification; Recombinant Proteins/metabolism; Recombination, Genetic

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ECOLI:RECG

enables

GO:0003678: DNA helicase activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ECOLI:RECG

enables

GO:0004003: ATP-dependent DNA helicase activity

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ECOLI:RECG

part_of

GO:0009379: Holliday junction helicase complex

ECO:0000314: direct assay evidence used in manual assertion

C

Seeded From UniProt

complete

See also

References

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