Identification of the operon for the sorbitol (Glucitol) Phosphoenolpyruvate:Sugar phosphotransferase system in Streptococcus mutans.
Transposon mutagenesis and marker rescue were used to isolate and identify an 8.5-kb contiguous region containing six open reading frames constituting the operon for the sorbitol P-enolpyruvate phosphotransferase transport system (PTS) of Streptococcus mutans LT11. The first gene, srlD, codes for sorbitol-6-phosphate dehydrogenase, followed downstream by srlR, coding for a transcriptional regulator; srlM, coding for a putative activator; and the srlA, srlE, and srlB genes, coding for the EIIC, EIIBC, and EIIA components of the sorbitol PTS, respectively. Among all sorbitol PTS operons characterized to date, the srlD gene is found after the genes coding for the EII components; thus, the location of the gene in S. mutans is unique. The SrlR protein is similar to several transcriptional regulators found in Bacillus spp. that contain PTS regulator domains (J. Stülke, M. Arnaud, G. Rapoport, and I. Martin-Verstraete, Mol. Microbiol. 28:865-874, 1998), and its gene overlaps the srlM gene by 1 bp. The arrangement of these two regulatory genes is unique, having not been reported for other bacteria.
Boyd
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Department of Oral Biology, University of Manitoba, Winnipeg, Manitoba, Canada R3E 0W2.
Thevenot
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Gumbmann
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Honeyman
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Hamilton
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D000595:Amino Acid Sequence; D002237:Carbohydrate Dehydrogenases / Q000235:genetics*; D004251:DNA Transposable Elements; D004269:DNA, Bacterial / Q000737:chemistry; D005798:Genes, Bacterial; D005809:Genes, Regulator; D008969:Molecular Sequence Data; D016366:Open Reading Frames; D009876:Operon; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System / Q000235:genetics*; D013012:Sorbitol / Q000378:metabolism*; D013295:Streptococcus mutans / Q000235:genetics* / Q000254:growth & development
D004251:DNA Transposable Elements; D004269:DNA, Bacterial; D013012:Sorbitol; D002237:Carbohydrate Dehydrogenases; C104557:sorbose dehydrogenase; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System