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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Hofinger, Andreas Messner, Paul Zarschler, Kristof Schäffer, Christina Werz, Daniel B. Novotny, René Seeberger, Peter H. Steiner, Kerstin Kosma, Paul |
| Description | Author Affiliation: Steiner K ( Center for NanoBiotechnology, University of Natural Resources and Applied Life Sciences, Vienna, Austria.) |
| Abstract | The Gram-positive bacterium Geobacillus stearothermophilus NRS 2004/3a possesses a cell wall containing an oblique surface layer (S-layer) composed of glycoprotein subunits. O-Glycans with the structure $[→2)-α-l-Rhap-(1→3)-β-l-Rhap-(1→2)-α-l-Rhap-(1→]_{n}$ $_{=$ 13-18, a2-O-methyl group capping the terminal repeating unit at the nonreducing end and a $→2)-α-l-Rhap-[(1→3)-α-l-Rhap]_{n}$ $_{=$ 1-2(1→3)- adaptor are linked via a β-d-Galp residue to distinct sites of the S-layer protein SgsE. S-layer glycan biosynthesis is encoded by a polycistronic slg (surface layer glycosylation) gene cluster. Four assigned glycosyltransferases named WsaC-WsaF, were investigated by a combined biochemical and NMR approach, starting from synthetic octyl-linked saccharide precursors. We demonstrate that three of the enzymes are rhamnosyltransferases that are responsible for the transfer of l-rhamnose from a dTDP-β-l-Rha precursor to the nascent S-layer glycan, catalyzing the formation of the α1,3- (WsaC and WsaD) and β1,2-linkages (WsaF) present in the adaptor saccharide and in the repeating units of the mature S-layer glycan, respectively. These enzymes work in concert with a multifunctional methylrhamnosyltransferase (WsaE). The N-terminal portion of WsaE is responsible for the S-adenosylmethionine-dependent methylation reaction of the terminal α1,3-linked l-rhamnose residue, and the central and C-terminal portions are involved in the transfer of l-rhamnose from dTDP-β-l-rhamnose to the adaptor saccharide to form the α1,2- and α1,3-linkages during S-layer glycan chain elongation, with the methylation and the glycosylation reactions occurring independently. Characterization of these enzymes thus reveals the complete molecular basis for S-layer glycan biosynthesis. |
| ISSN | 00219258 |
| e-ISSN | 1083351X |
| Journal | Journal of Biological Chemistry |
| Issue Number | 30 |
| Volume Number | 283 |
| Language | English |
| Publisher | American Society for Biochemistry and Molecular Biology (United States) |
| Publisher Date | 2008-07-25 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Gene Expression Regulation, Bacterial Geobacillus Stearothermophilus Metabolism Membrane Glycoproteins Chemistry Polysaccharides Chromatography, Thin Layer Escherichia Coli Glycosylation Magnetic Resonance Spectroscopy Models, Biological Models, Chemical Multigene Family Plasmids Biosynthesis Protein Structure, Tertiary Recombinant Proteins Spectrometry, Mass, Electrospray Ionization Research Support, Non-U.S. Gov't Biochemistry Molecular Biology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Biochemistry Molecular Biology |
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