Two genes (ptsI and ptsA) that encode homologues of the energy coupling Enzyme I of the phosphoenolpyruvate-dependent sugar-transporting phosphotransferase system (PTS) have previously been identified on the Escherichia coli chromosome. We here report the presence of a third E. coli gene, designated ptsP, that encodes an Enzyme I homologue, here designated Enzyme INtr. Enzyme INtr possesses an N-terminal domain homologous to the N-terminal domains of NifA proteins [(127 amino acids (aa)] joined via two tandem flexible linkers to the C-terminal Enzyme I-like domain (578 aa). Structural features of the putative ptsP operon, including transcriptional regulatory signals, are characterized. We suggest that Enzyme INtr functions in transcriptional regulation of nitrogen-related operons together with previously described PTS proteins encoded within the rpoN operon. It may thereby provide a link between carbon and nitrogen assimilatory pathways.
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