title: [The pssA gene encodes UDP-glucose: polyprenyl phosphate-glucosyl phosphotransferase initiating biosynthesis of Rhizobium leguminosarum exopolysaccharide].
abstract: Symbiotic nitrogen-fixing bacteria Rhizobium leguminosarum by. viciae VF39 secrete an acidic heteropolysaccharide, the biosynthesis of which involves the stage of polyprenyl diphosphate octasaccharide formation, with its carbohydrate fragment corresponding to the repeating polymer unit. The amino acid analysis of the product of the pssA gene, we have earlier identified, showed its homology to bacterial polyisoprenyl phosphate hexose 1-phosphate transferases catalyzing the formation of phosphodiester bonds between polyprenyl phosphates and hexose 1-phosphates, whose donors are nucleotide sugars. The immunoblotting demonstrated that Rhizobium cells synthesize a protein with a molecular mass of 25 kDa, which implies the translation of the open reading frame occurring from the second initiating codon followed by the protein processing. It was shown that PssA is an integral membrane-bound protein involved in glucose 1-phosphate transfer from UDP-glucose to polyprenyl phosphate to form polyprenyl diphosphate glucose. These results suggest that the pssA gene encodes UDP-glucose:polyprenyl phosphate-glucosyl phosphotransferase.
authors: V N
authors: VN
authors: Ksenzenko
authors: T V
authors: TV
authors: Ivashina
authors: Z A
authors: ZA
authors: Dubeĭkovskaia
authors: S G
authors: SG
authors: Ivanov
authors: M B
authors: MB
authors: Nanazashvili
authors: T N
authors: TN
authors: Druzhinina
authors: N A
authors: NA
authors: Kalinchuk
authors: V N
authors: VN
authors: Shibaev
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000032:analysis / Q000235:genetics*; D015153:Blotting, Western; D003001:Cloning, Molecular; D004926:Escherichia coli / Q000235:genetics; D016695:Glycosyltransferases / Q000032:analysis / Q000235:genetics*; D008565:Membrane Proteins / Q000032:analysis / Q000235:genetics*; D008969:Molecular Sequence Data; D011135:Polysaccharides, Bacterial / Q000096:biosynthesis* / Q000737:chemistry / Q000235:genetics; D016961:Rhizobium leguminosarum / Q000201:enzymology* / Q000235:genetics; D016415:Sequence Alignment
chemical_list: D001426:Bacterial Proteins; C083492:EPSI polysaccharide; D008565:Membrane Proteins; D011135:Polysaccharides, Bacterial; D016695:Glycosyltransferases; C412464:PssA protein, Rhizobium leguminosarum