title: Cloning, sequencing and expression in Escherichia coli of the ptsI gene encoding enzyme I of the phosphoenolpyruvate:sugar phosphotransferase transport system from Streptococcus salivarius.
abstract: We present the cloning and sequencing of the ptsI gene, encoding enzyme I (EI) of the phosphoenolpyruvate (PEP): sugar phosphotransferase (PTS) transport system from Streptococcus salivarius. The ptsI gene corresponds to an open reading frame of 1731 nucleotides, which translates into a putative 577-amino acid (aa) protein with a M(r) of 62,948 and a pI of 4.49. The EI was produced in Escherichia coli under the control of its own promoter located immediately upstream of ptsI, a situation never previously reported for any other gene coding for an EI. The deduced aa sequence of the S. salivarius EI shows a high degree of similarity with the E. coli EI and the EI moiety of the multiphosphoryl transfer protein from Rhodobacter capsulatus. The S. salivarius EI also shares a highly conserved aa cluster with a non-PTS protein, the maize pyruvate:orthophosphate dikinase. The conserved cluster is located in a domain which is hypothesized to be the PEP-binding site.
authors.affiliation: Département de Biochimie (Sciences), Université Laval, Ste-Foy, Québec, Canada.
authors.forename: G
authors.initials: G
authors.lastname: Gagnon
authors.forename: C
authors.initials: C
authors.lastname: Vadeboncoeur
authors.forename: R C
authors.initials: RC
authors.lastname: Levesque
authors.forename: M
authors.initials: M
authors.lastname: Frenette
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D003001:Cloning, Molecular; D004269:DNA, Bacterial; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System / Q000235:genetics*; D015183:Restriction Mapping; D017386:Sequence Homology, Amino Acid; D013291:Streptococcus / Q000201:enzymology*
chemical_list: D004269:DNA, Bacterial; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System