PMID:8550414
| Citation |
Hegde, SP, Rajagopalan, M and Madiraju, MV (1996) Preferential binding of Escherichia coli RecF protein to gapped DNA in the presence of adenosine (gamma-thio) triphosphate. J. Bacteriol. 178:184-90 |
|---|---|
| Abstract |
Escherichia coli RecF protein binds, but does not hydrolyze, ATP. To determine the role that ATP binding to RecF plays in RecF protein-mediated DNA binding, we have determined the interaction between RecF protein and single-stranded (ss)DNA, double-stranded (ds)DNA, and dsDNA containing ssDNA regions (gapped [g]DNA) either alone or in various combinations both in the presence and in the absence of adenosine (gamma-thio) triphosphate, gamma-S-ATP, a nonhydrolyzable ATP analog. Protein-DNA complexes were analyzed by electrophoresis on agarose gels and visualized by autoradiography. The type of protein-DNA complexes formed in the presence of gamma-S-ATP was different with each of the DNA substrates and from those formed in the absence of gamma-S-ATP. Competition experiments with various combinations of DNA substrates indicated that RecF protein preferentially bound gDNA in the presence of gamma-S-ATP, and the order of preference of binding was gDNA > dsDNA > ssDNA. Since gDNA has both ds- and ssDNA components, we suggest that the role for ATP in RecF protein-DNA interactions in vivo is to confer specificity of binding to dsDNA-ssDNA junctions, which is necessary for catalyzing DNA repair and recombination. |
| Links | |
| Keywords |
Adenosine Triphosphate/analogs & derivatives; Adenosine Triphosphate/pharmacology; Bacterial Proteins/metabolism; Binding, Competitive; DNA/metabolism; DNA, Single-Stranded/metabolism; DNA, Viral/metabolism; DNA-Binding Proteins/metabolism; Escherichia coli/chemistry; Escherichia coli Proteins; Protein Binding |
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