1fo8

CRYSTAL STRUCTURE OF N-ACETYLGLUCOSAMINYLTRANSFERASE ICRYSTAL STRUCTURE OF N-ACETYLGLUCOSAMINYLTRANSFERASE I

Structural highlights 1fo8 is a 1 chain structure with sequence from Oryctolagus cuniculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: Related: 1fo9, 1foa Activity: Alpha-1,3-mannosyl-glycoprotein 2-beta-N-acetylglucosaminyltransferase, with EC number 2.4.1.101 Resources: FirstGlance, OCA, RCSB, PDBsum Function [MGAT1_RABIT] Initiates complex N-linked carbohydrate formation. Essential for the conversion of high-mannose to hybrid and complex N-glycans. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed N:-acetylglucosaminyltransferase I (GnT I) serves as the gateway from oligomannose to hybrid and complex N:-glycans and plays a critical role in mammalian development and possibly all metazoans. We have determined the X-ray crystal structure of the catalytic fragment of GnT I in the absence and presence of bound UDP-GlcNAc/Mn(2+) at 1.5 and 1.8 A resolution, respectively. The structures identify residues critical for substrate binding and catalysis and provide evidence for similarity, at the mechanistic level, to the deglycosylation step of retaining beta-glycosidases. The structuring of a 13 residue loop, resulting from UDP-GlcNAc/Mn(2+) binding, provides an explanation for the ordered sequential 'Bi Bi' kinetics shown by GnT I. Analysis reveals a domain shared with Bacillus subtilis glycosyltransferase SpsA, bovine beta-1,4-galactosyl transferase 1 and Escherichia coli N:-acetylglucosamine-1-phosphate uridyltransferase. The low sequence identity, conserved fold and related functional features shown by this domain define a superfamily whose members probably share a common ancestor. Sequence analysis and protein threading show that the domain is represented in proteins from several glycosyltransferase families. X-ray crystal structure of rabbit N-acetylglucosaminyltransferase I: catalytic mechanism and a new protein superfamily.,Unligil UM, Zhou S, Yuwaraj S, Sarkar M, Schachter H, Rini JM EMBO J. 2000 Oct 16;19(20):5269-80. PMID:11032794 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also O-GlcNAc transferase

spinqualitylabelsall models 1fo8, resolution 1.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image