Novel phosphotransferase system genes revealed by bacterial genome analysis

the complete complement of pts genes in Mycoplasma genitalium.

J. Reizer*, I. T. Paulsen, A. Reizer, F. Titgemeyer, M. H. Saier

*Corresponding author for this work

Research output: Contribution to journalArticle

22 Citations (Scopus)


The complete sequence of the Mycoplasma genitalium chromosome has recently been determined. We here report analyses of the genes encoding proteins of the phosphoenolpyruvate:sugar phosphotransferase system, PTS. These genes encode (1) Enzyme I, (2) HPr, (3) a glucose-specific Enzyme IICBA, (4) an inactive glucose-specific Enzyme IIB, lacking the active site cysteyl residue, and (5) a fructose-specific Enzyme IIABC. Some of the unique features of these genes and their enzyme products are as follows. (1) Each of the genes is encoded within a distinct operon. (2) Both Enzyme I and HPr have basic isoelectric points. (3) The glucose-specific Enzyme IIC bears a centrally located, hydrophilic, 200 amino acyl residue insert that lacks sequence similarity with any protein in the current database. (4) The fructose-specific Enzyme II has a domain order (IIABC), different from those of previously characterized fructose permeases, and its IIA domain more closely resembles the IIANtr protein of Escherichia coli than other fructose-specific IIA domains. The potential significance of these novel features is discussed.

Original languageEnglish
Pages (from-to)151-164
Number of pages14
JournalMicrobial & comparative genomics
Issue number3
Publication statusPublished - 1996
Externally publishedYes

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