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PMID:12514138

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Citation

Noirot, P, Gupta, RC, Radding, CM and Kolodner, RD (2003) Hallmarks of homology recognition by RecA-like recombinases are exhibited by the unrelated Escherichia coli RecT protein. EMBO J. 22:324-34

Abstract

Homologous recombination is a fundamental process for genome maintenance and evolution. Various proteins capable of performing homology recognition and pairing of DNA strands have been isolated from many organisms. The RecA family of proteins exhibits a number of biochemical properties that are considered hallmarks of homology recognition. Here, we investigated whether the unrelated Escherichia coli RecT protein, which mediates homologous pairing and strand exchange, also exhibits such properties. We found that, like RecA and known RecA homologs: (i) RecT promotes the co-aggregation of ssDNA with duplex DNA, which is known to facilitate homologous contacts; (ii) RecT binding to ssDNA mediates unstacking of the bases, a key step in homology recognition; (iii) RecT mediates the formation of a three-strand synaptic intermediate where pairing is facilitated by local helix destabilization, and the preferential switching of A:T base pairs mediates recognition of homology; and (iv) RecT-mediated pairing occurs from both 3'- and 5'-single-stranded ends. Taken together, our results show that RecT shares fundamental homology-recognition properties with the RecA homologs, and provide new insights on an underlying universal mechanism of homologous recognition.

Links

PubMed PMC140102 Online version:10.1093/emboj/cdg027

Keywords

Bacterial Proteins/genetics; Bacterial Proteins/metabolism; Base Pairing; DNA Nucleotidyltransferases/genetics; DNA Nucleotidyltransferases/metabolism; DNA, Bacterial/metabolism; DNA-Binding Proteins/genetics; DNA-Binding Proteins/metabolism; Escherichia coli/metabolism; Escherichia coli Proteins/genetics; Escherichia coli Proteins/metabolism; Fluorescence Resonance Energy Transfer; Macromolecular Substances; Nucleic Acid Conformation; Oligonucleotides/genetics; Oligonucleotides/metabolism; Protein Binding; Rec A Recombinases/genetics; Rec A Recombinases/metabolism; Recombinases; Recombination, Genetic

Significance

Annotations

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

ECOLI:RECT

acts_upstream_of_or_within

GO:0032508: DNA duplex unwinding

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete

ECOLI:RECT

enables

GO:0003697: single-stranded DNA binding

ECO:0000314: direct assay evidence used in manual assertion

F

Seeded From UniProt

complete

ECOLI:RECT

involved_in

GO:0032508: DNA duplex unwinding

ECO:0000314: direct assay evidence used in manual assertion

P

Seeded From UniProt

complete


See also

References

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