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- W2021496989 abstract "Recent Escherichia coli genome sequencing efforts in the 76–81.5 min and 92.8–0.1 min regions have revealed three new operons or gene clusters concerned with sugar metabolism, which we designate sga (6 ORFs), sgb (4 ORFs), and sgc (6 ORFs). All of these operons encode proteins homologous to pentose-phosphate-4-epimerases (sga and sgb) or pentose-phosphate-3-epimerases (sgc), indicating that these operons are involved in the metabolism of pentoses or pentitols. sga and sgc (but not sgb) encode also proteins of the bacterial phosphotransferase system (PTS), whereas sga and sgb encode three non-PTS proteins (one of which is the pentose-phosphate-4-epimerase homologue) that are homologous to each other. The two PTS protein homologues in the sga operon are members of (1) the family of mannitol-specific and fructose-specific IIA proteins and (2) the family of lactose-specific and cellobiose-specific IIB proteins. A IIC PTS homologue was not found in the sga operon, but a permease-like protein designated SgaT with 12 putative transmembrane helical segments may provide this transport function. Although the sgb operon lacks ORF homologous to PTS proteins, it contains a cryptic gene encoding L-xylulose kinase. The sgc gene cluster encodes two PTS proteins homologous to (1) the mannitol-specific and fructose-specific IIA proteins and (2) the galactitol IIC protein. It also encodes a transcriptional regulator of the DeoR family, a pentose-phosphatase-3-epimerase homologue, and an ORF homologous to a protein encoded in the recently described frv operon. Computer analyses of the DNA sequences and the encoded protein sequences are presented, and the potential roles of these operons in carbohydrate metabolism are discussed." @default.
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- W2021496989 date "1996-01-01" @default.
- W2021496989 modified "2023-09-25" @default.
- W2021496989 title "Novel Phosphotransferase System Genes Revealed by Bacterial Genome Analysis: Operons Encoding Homologues of Sugar-Specific Permease Domains of the Phosphotransferase System and Pentose Catabolic Enzymes" @default.
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- W2021496989 doi "https://doi.org/10.1089/gst.1996.1.53" @default.
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