Abstract
Mutations in the ack (acetate kinase) and pta (phosphotransacetylase) genes in Salmonella typhimurium were characterized and determined to be analogous to those of previously described Escherichia coli mutants. We established that in both bacterial species these genes were cotransducible with the neighboring histidine transport operon and were distally located relative to purF. pta mutants were sensitive to the dye alizarin yellow and were unable to grow on medium containing inositol as a carbon source. We selected mutants of both species with deletions covering both the ack and the pta genes; some deletions extended into the histidine transport operon.
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