Structural highlights
Publication Abstract from PubMedBacterial surface polysaccharides are assembled by glycosyltransferase enzymes that typically use sugar nucleotide or polyprenyl-monophosphosugar activated donors. Characterized representatives exist for many monosaccharides but neither the donor nor the corresponding glycosyltransferases have been definitively identified for ribofuranose residues found in some polysaccharides. Klebsiella pneumoniae O-antigen polysaccharides provided prototypes to identify dual-domain ribofuranosyltransferase proteins catalyzing a two-step reaction sequence. Phosphoribosyl-5-phospho-D-ribosyl-alpha-1-diphosphate serves as the donor for a glycan acceptor-specific phosphoribosyl transferase (gPRT), and a more promiscuous phosphoribosyl-phosphatase (PRP) then removes the residual 5'-phosphate. The 2.5-A resolution crystal structure of a dual-domain ribofuranosyltransferase ortholog from Thermobacillus composti revealed a PRP domain that conserves many features of the phosphatase members of the haloacid dehalogenase family, and a gPRT domain that diverges substantially from all previously characterized phosphoribosyl transferases. The gPRT represents a new glycosyltransferase fold conserved in the most abundant ribofuranosyltransferase family. The biosynthetic origin of ribofuranose in bacterial polysaccharides.,Kelly SD, Williams DM, Nothof JT, Kim T, Lowary TL, Kimber MS, Whitfield C Nat Chem Biol. 2022 May;18(5):530-537. doi: 10.1038/s41589-022-01006-6. Epub 2022, Apr 7. PMID:35393575[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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