Identification of a UDP-Gal: GlcNAc-R galactosyltransferase activity in Escherichia coli VW187
摘要:
A novel acceptor substrate for galactosyltransferase was synthesized containing GlcNAcalpha-pyrophosphate, covalently bound to a hydrophobic phenoxyundecyl moiety (GlcNAc alpha-PO3-PO3-(CH2)(11)-O-Phenyl). The new substrate was used to develop an assay for a galactosyltransferase activity from Escherichia coli strain VW187 that is involved in lipopolysaccharide synthesis and has not been studied by others. We showed that Gal was transferred from UDP-Gal to the novel acceptor substrate. This was a significant improvement over our previous preliminary assays of the enzyme using endogenous substrate, and showed that these synthetic substrates are useful for assaying enzymes that utilize lipid-bound substrates in O-chain synthesis in Gram-negative bacteria. (C) 2004 Elsevier Ltd. All rights reserved.
Synthesis of P 1 -(11-phenoxyundecyl)-P 2 -(2-acetamido-2-deoxy-3- O -α- D -rhamnopyranosyl-α- D -glucopyranosyl) diphosphate and P 1 -(11-phenoxyundecyl)-P 2 -(2-acetamido-2-deoxy-3- O -β- D -galactopyranosyl-α- D -galactopyranosyl) diphosphate for the investigation of biosynthesis of O-antigenic polysaccharides in Pseudomonas aeruginosa and Escherichia coli O104
Two new phenoxyundecyl diphosphate sugars were synthesized for the first time: P1-(11-phenoxyundecyl)-P2- (2-acetamido-2-deoxy-3-O-α-D-rhamnopyranosyl-α-D-glucopyranosyl) diphosphate and P1-(11-phenoxyundecyl)-P2-(2-acetamido-2-deoxy-3-O-β-D-galactopyranosyl-α-D-galactopyranosyl) diphosphate to study the third step of biosynthesis of the repeating units of O-antigenic polysaccharides in Pseudomonas
A new β-rhamnoslytransferase Cps23FT from Streptococcus pneumonia serotype 23F was expressed and characterized. Its enzymatic activity and function were confirmed for the first time by utilizing enzymatically prepared dTDP-Rha and chemically synthesized Glcα-PP-(CH2)11-OPh as substrates. This reaction gave the desired disaccharide Rhaβ-1,4-Glcα-PP-(CH2)11-OPh in a good isolated yield (67%), suggesting
A very simple synthesis of GlcNAc-α-pyrophosphoryl-decanol: A substrate for the assay of a bacterial galactosyltransferase
作者:Inka Brockhausen、E. Andreas Larsson、Ole Hindsgaul
DOI:10.1016/j.bmcl.2007.11.031
日期:2008.1
Lipid-linked sugar pyrophosphates, such as GlcNAc-pyrophosphoryl undecaprenol, are important intermediates in the biosynthesis of cell-surface bacterial polysaccharides. It was recently demonstrated that much simpler lipids could substitute for undecaprenol while retaining biological activity, thus making efficient synthetic access to this class of compounds highly desirable. In order to facilitate the synthesis of pure substrates for bacterial glycosyltransferases, we have developed a simple 'two-pot' synthesis which we demonstrate here for GlcNAc-alpha-pyrophosphoryl-decanol (4). GlcNAc pyrophosphate, produced by mild periodate oxidation/beta-elimination of commercial UDP-GlcNAc, is alkylated using 1-iododecane to yield the target compound 4 in 39% yield. Compound 4 is shown to be an efficient acceptor for a bacterial galactosyltransferase. (c) 2007 Elsevier Ltd. All rights reserved.
Simple synthesis of P 1-(11-phenoxyundecyl)-P 2-(2-acetamido-2-deoxy-α-D-galactopyranosyl) diphosphate
作者:N. S. Utkina、L. L. Danilov、T. N. Druzhinina、V. V. Veselovskii
DOI:10.1134/s1068162010060166
日期:2010.11
A simple method of the synthesis of P (1)-(11-phenoxyundecyl)-P (2)-(2-acetamido-2-deoxy-alpha-D-galactopyranosyl) diphosphate, which is a synthetic lipid acceptor for glycosyl transferases participating in the biosynthesis of O-antigenic polysaccharides of Gram-negative bacteria, is suggested.
11-Phenoxyundecyl phosphate as a 2-acetamido-2-deoxy-α-d-glucopyranosyl phosphate acceptor in O-antigen repeating unit assembly of Salmonella arizonae O:59
作者:Tatyana N. Druzhinina、Leonid L. Danilov、Vladimir I. Torgov、Natalya S. Utkina、Nadezhda M. Balagurova、Vladimir V. Veselovsky、Alexander O. Chizhov
DOI:10.1016/j.carres.2010.09.021
日期:2010.12
A synthesis of 11-phenoxyundecyl phosphate and its biochemical transformation (using GlcNAc-P transferase from Salmonella arizonae 0 59 membranes catalysing transfer of GlcNc-phosphate from UDP-GlcNAc on lipid-phosphate) into P(1)-11-phenoxyundecyl P(2)-2-acetamido-2-deoxy-alpha-D-glucopyranosyl diphosphate are described (C) 2010 Elsevier Ltd All rights reserved