In vitro, Escherichia coli RecA protein acts upon gapped and partially homologous linear duplex DNA to generate recombination products linked by Holliday junctions. When strand exchange reactions are supplemented with purified RecBCD enzyme, we observe the formation of products that resemble ''patch'' recombinants. The formation of ''splice'' recombinant products was not observed. The individual subunits, RecB, RecC, or RecD, had no effect on RecA protein-mediated strand exchange nor on the Holliday junctions formed in the reaction. Analysis of the way in which patch products arise indicates exonucleolytic digestion of the linear arms of the recombination intermediates (α-structures) by RecBCD enzyme. We find no evidence for specific resolution events at the site of the Holliday junction by RecBCD enzyme using these DNA substrates.
|Original language||English (US)|
|Number of pages||6|
|Journal||Journal of Biological Chemistry|
|State||Published - Nov 22 1991|
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology