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. 1976 Jun;126(3):1082-8.
doi: 10.1128/jb.126.3.1082-1088.1976.

Genetic mapping of xthA, the structural gene for exonuclease III in Escherichia coli K-12

B J White, S J Hochhauser, N M Cintron, B Weiss

Genetic mapping of xthA, the structural gene for exonuclease III in Escherichia coli K-12

B J White et al. J Bacteriol. 1976 Jun.

Abstract

The genes xthA, pncA, and pabB were ordered relative to others by two- and three-factor transductional crosses with bacteriophage P1. The genes studied span 2 min (2%) of the genetic map of Escherichia coli K-12 in the clockwise sequence pheS-pfkB-xthA-pncA-gap-pabB-fadD. Eleven independently derived xth mutations were examined; all were known to affect exonuclease III and its associated endonuclease II activity, and all were mapped in the xthA region. pncA mutations were found to confer resistance to 6-aminonicotinamide, whereas some pheS mutations are known to specify resistance to p-fluorphenylalanine. xth mutations were readily transferred into other strains by selecting for these co-transducible drug resistance markers.

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