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- W1917607054 abstract "Abstract In the background of weak, if any, constitutive SOS function, RecA from Pseudomonas aeruginosa (RecAPa) shows a higher frequency of recombination exchange (FRE) per DNA unit length as compared to RecA from Escherichia coli (RecAEc). To understand the molecular basis for this observation and to determine which regions of the RecAPa polypeptide are responsible for this unusual activity, we analyzed recAX chimeras between the recAEc and recAPa genes. We chose 31 previously described recombination- and repair-proficient recAX hybrids and determined their FRE calculated from linkage frequency data and constitutive SOS function expression as measured by using the lacZ gene under control of an SOS-regulated promoter. Relative to recAEc, the FRE of recAPa was 6.5 times greater; the relative alterations of FRE for recAX genes varied from ~0.6 to 9.0. No quantitative correlation between the FRE increase and constitutive SOS function was observed. Single ([L29M] or [I102D]), double ([G136N, V142I]), and multiple substitutions in related pairs of chimeric RecAX proteins significantly altered their relative FRE values. The residue content of three separate regions within the N-terminal and central but not the C-terminal protein domains within the RecA molecule also influenced the FRE values. Critical amino acids in these regions were located close to previously identified sequences that comprise the two surfaces for subunit interactions in the RecA polymer. We suggest that the intensity of the interactions between the subunits is a key factor in determining the FRE promoted by RecA in vivo." @default.
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- W1917607054 date "2001-09-01" @default.
- W1917607054 modified "2023-10-15" @default.
- W1917607054 title "Recombinogenic Activity of Chimeric <i>recA</i> Genes (<i>Pseudomonas aeruginosa/Escherichia coli</i>): A Search for RecA Protein Regions Responsible for This Activity" @default.
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- W1917607054 doi "https://doi.org/10.1093/genetics/159.1.7" @default.
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