Phosphotransferase-Mediated Regulation Of Carbohydrate Utilization In Escherichia coli K12: Location of the gsr (tgs) and iex (err) Genes by Specialized Transduction: With an Appendix: Two Separate Genes Involved in Sulphate Transport in Escherichia coli K12

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Abstract
A lysogen of E. coli K12 with .lambda.cI857 S7 xis6 nin5 b515 b519 integrated into ptsI was induced and the lysates plated on a Pel- host [on which .lambda. strains with less than the wild-type amount of DNA form plaques at low frequency (Cameron et al., 1977)]. All of the 40 plaques examined contained phage able to transduce at least 2 of the genes known from bacteriophage P1 transduction experiments to be closely linked to ptsI. Assuming that each specialized transducing phage arose by a single illegitimate recombination event, the distribution of phage types showed that the gene order is cysA gsr ptsI (ptsH, iex) cysZ lig; gsr+ and iex+ were dominant. Analysis of restriction endonuclease digests of the transducing phage confirmed that no unexpected DNA rearrangements took place and allowed the construction of a map of the sites of action of the restriction endonucleases EcoRI, HindIII, BamI and Kpn for over 20 kilobases of E. coli DNA. cysA and cysZ mutants are deficient in sulfate assimilation.