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Journal of Bacteriology, April 2001, p. 2259-2264, Vol. 183, No. 7
Biochemical Science and Engineering, Central
Research and Development, DuPont Company, Wilmington, Delaware
19880-0173
Received 6 October 2000/Accepted 3 January 2001
Mitomycin C (MMC), a DNA-damaging agent, is a potent inducer of the
bacterial SOS response; surprisingly, it has not been used to
select resistant mutants from wild-type Escherichia coli. MMC resistance is caused by the presence of any of four distinct E. coli genes (mdfA, gyrl, rob, and
sdiA) on high-copy-number vectors. mdfA
encodes a membrane efflux pump whose overexpression results
in broad-spectrum chemical resistance. The gyrI (also called sbmC) gene product inhibits DNA gyrase
activity in vitro, while the rob protein appears to
function in transcriptional activation of efflux
pumps. SdiA is a transcriptional activator of ftsQAZ genes
involved in cell division.
0021-9193/01/$04.00+0 DOI: 10.1128/JB.183.7.2259-2264.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
In Vivo Titration of Mitomycin C Action by Four Escherichia
coli Genomic Regions on Multicopy Plasmids

and
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Corresponding author. Mailing address: DuPont Company,
Central Research and Development, Biochemical Science and Engineering, Experimental Station, P.O. Box 80173, Wilmington, DE 19880-0173. Phone: (302) 695-9264. Fax: (302) 695-9183. E-mail:
Robert.A.LaRossa{at}usa.dupont.com.
Present address: Blackstone Technology Group, Boston, MA 02110.
Present address: Department of Biology, Swarthmore College,
Swarthmore, PA 19081-1397.
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