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Journal of Bacteriology, May 2004, p. 2900-2905, Vol. 186, No. 9
0021-9193/04/$08.00+0     DOI: 10.1128/JB.186.9.2900-2905.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Polymerases Leave Fingerprints: Analysis of the Mutational Spectrum in Escherichia coli rpoB To Assess the Role of Polymerase IV in Spontaneous Mutation

Department of Microbiology, Immunology, and Molecular Genetics and the Molecular Biology Institute, University of California, Los Angeles, California 90095

Received 21 October 2003/ Accepted 6 January 2004

We compared the distribution of mutations in rpoB that lead to rifampin resistance in strains with differing levels of polymerase IV (Pol IV), including strains with deletions of the Pol IV-encoding dinB gene, strains with a chromosomal copy of dinB, strains with the F'128 plasmid, and strains with plasmid amplification of either the dinB operon (dinB-yafNOP) or the dinB gene alone. This analysis identifies several hot spots specific to Pol IV which are virtually absent from the normal spontaneous spectrum, indicating that Pol IV does not contribute significantly to mutations occurring during exponential growth in liquid culture.

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