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The genes ptsI and ptsH, which encode, respectively, enzyme I and Hpr, cytoplasmic proteins involved in the phosphoenolpyruvate:sugar phosphotransferase system, were cloned from Bacillus subtilis. A plasmid containing a 4.1-kilobase DNA fragment was shown to complement Escherichia coli mutations affecting the ptsH and ptsI genes. In minicells this plasmid expressed two proteins with the molecular weights expected for Hpr and enzyme I. Therefore, ptsH and ptsI are adjacent in B. subtilis, as in E. coli. In E. coli a third gene (crr), involved in glucose translocation and also in catabolite repression, is located downstream from the ptsHI operon. The 4.1-kilobase fragment from B. subtilis was shown to contain a gene that enables an E. coli crr mutant to use glucose. This gene, unlike the E. coli crr gene, was located to the left of ptsH.

journal of bacteriology

Phosphoenolpyruvate:sugar phosphotransferase system of Bacillus subtilis: cloning of the region containing the ptsH and ptsI genes and evidence for a crr-like gene