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The RecOR proteins modulate RecA protein function at 5′ ends of single‐stranded DNA
Author(s) -
Bork Julie M.,
Cox Michael M.,
Inman Ross B.
Publication year - 2001
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1093/emboj/20.24.7313
Subject(s) - biology , dna , function (biology) , genetics , dna binding protein , microbiology and biotechnology , computational biology , gene , transcription factor
The Escherichia coli RecF, RecO and RecR pro teins have previously been implicated in bacterial recombinational DNA repair at DNA gaps. The RecOR‐facilitated binding of RecA protein to single‐stranded DNA (ssDNA) that is bound by single‐stranded DNA‐binding protein (SSB) is much faster if the ssDNA is linear, suggesting that a DNA end (rather than a gap) facilitates binding. In addition, the RecOR complex facilitates RecA protein‐mediated D‐loop formation at the 5′ ends of linear ssDNAs. RecR protein remains associated with the RecA filament and its continued presence is required to prevent filament disassembly. RecF protein competes with RecO protein for RecR protein association and its addition destabilizes RecAOR filaments. An enhanced function of the RecO and RecR proteins can thus be seen in vitro at the 5′ ends of linear ssDNA that is not as evident in DNA gaps. This function is countered by the RecF/RecO competition for association with the RecR protein.