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Journal of Bacteriology, December 1998, p. 6269-6275, Vol. 180, No. 23
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Sister Chromatid Exchange Frequencies in Escherichia coli Analyzed by Recombination at the dif Resolvase Site

Walter W. Steinerdagger and Peter L. Kuempel*

Department of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, Colorado 80309

Received 8 June 1998/Accepted 29 September 1998

Sister chromatid exchange (SCE) in Escherichia coli results in the formation of circular dimer chromosomes, which are converted back to monomers by a compensating exchange at the dif resolvase site. Recombination at dif is site specific and can be monitored by utilizing a density label assay that we recently described. To characterize factors affecting SCE frequency, we analyzed dimer resolution at the dif site in a variety of genetic backgrounds and conditions. Recombination at dif was increased by known hyperrecombinogenic mutations such as polA, dut, and uvrD. It was also increased by a fur mutation, which increased oxidative DNA damage. Recombination at dif was eliminated by a recA mutation, reflecting the role of RecA in SCE and virtually all homologous recombination in E. coli. Interestingly, recombination at dif was reduced to approximately half of the wild-type levels by single mutations in either recB or recF, and it was virtually eliminated when both mutations were present. This result demonstrates the importance of both RecBCD and RecF to chromosomal recombination events in wild-type cells.

* Corresponding author. Mailing address: Dept. of Molecular, Cellular, and Developmental Biology, University of Colorado, Boulder, CO 80309. Phone: (303) 492-7952. Fax: (303) 492-7744. E-mail: Peter.Kuempel{at}colorado.edu.

dagger Present address: Fred Hutchinson Cancer Research Center, Seattle, WA 98104-2092.

Journal of Bacteriology, December 1998, p. 6269-6275, Vol. 180, No. 23
0021-9193/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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