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DELETIONS GENERATED BY THE TRANSPOSON Tn10 IN THE srl recA REGION OF THE ESCHERICHIA COLI K-12 CHROMOSOME
László N. Csonka 1 and Alvin J. Clark 1
1 Department of Molecular Biology, University of California, Berkeley, California 94720
A negative regulatory gene for the srl operon (srlR) was recognized by the characteristics of an insertion mutation generated by the transposon Tn10 determining tetracycline resistance. This finding is discussed in light of previous hypotheses on the regulation of the srl genes, which mediate metabolism of glucitol (i.e, sorbitol). Mapping showed that the order of genes in this region is: srlR srlD srlC recA alaS. Using two different methods, five mutations of both srl and recA were detected. The phenotype conferred by these mutations, UV sensitivity and extreme recombination deficiency, is characteristic of standard recA point mutants. Three of the mutations were deletions that also removed the genes for tetracycline resistance of the nearby transposon. A fourth mutation ended at a distance from Tn10 sufficient to allow separation of the two by recombination following P1 transduction; our tests did not allow us to conclude whether this mutation was an inversion or a deletion. The fifth mutation was a deletion that seemed to end immediately adjacent to the boundary of Tn10, proximal to recA. Mechanisms for the generation of these srl recA mutations are discussed.
Submitted on December 29, 1978Revised on June 6, 1979
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