title: Fructose phosphotransferase system of Xanthomonas campestris pv. campestris: characterization of the fruB gene.
abstract: In the plant pathogen Xanthomonas campestris pv. campestris, fructose is transported by a specific phosphotransferase system (PTS). This PTS involves a multiphosphoryl transfer protein (MTP) encoded by the fruB gene, which was cloned and sequenced. fruB is part of a transcriptional unit together with the fruK gene, coding for 1-phosphofructokinase, which is located upstream from the fruA gene, coding for the fructose-specific permease (EIIB'BCFru). The amino acid sequence of the X. campestris MTP deduced from the fruB sequence shared 46% identical residues with an MTP identified in Rhodobacter capsulatus. The X. campestris MTP (837 amino acid residues) consists of three moieties: a fructose-specific enzyme-IIA-like N-terminal moiety (residues 1-148), followed by an HPr-like moiety (161-251) and an enzyme-I-like C-terminal moiety (274-837). The three domains are separated by two flexible hinge regions rich in proline and alanine residues. The construction of a fruB mutant confirmed the role of the MTP in fructose transport and phosphorylation in X. campestris.
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D002352:Carrier Proteins / Q000235:genetics*; D005632:Fructose / Q000378:metabolism*; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D047908:Intracellular Signaling Peptides and Proteins; D008969:Molecular Sequence Data; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System / Q000235:genetics*; D016354:Rhodobacter capsulatus / Q000235:genetics; D016415:Sequence Alignment; D016959:Xanthomonas campestris / Q000201:enzymology / Q000235:genetics*
chemical_list: D001426:Bacterial Proteins; D002352:Carrier Proteins; D047908:Intracellular Signaling Peptides and Proteins; C028640:fructose-induced HPr-like protein, bacteria; D005632:Fructose; D010731:Phosphoenolpyruvate Sugar Phosphotransferase System