2k46 | pdb_00002k46

Xenopus laevis malectin complexed with nigerose (Glcalpha1-3Glc)

spinqualitylabelsall models 2k46, 20 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2k46 is a 1 chain structure with sequence from Xenopus laevis. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: NGR Related: 2jwp Gene: MGC80075 (Xenopus laevis) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Function [MLECA_XENLA] Carbohydate-binding protein with a strong ligand preference for Glc2-N-glycan. May play a role in the early steps of protein N-glycosylation. Can bind di- or higher oligomers but not monomers of glucose, including maltose, maltotriose, maltotetraose, maltoheptaose, nigerose, kojibose, cellobiose and isomaltose, although based on their subcellular locations, these are unlikely to all be physiological ligands. 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-Glycosylation starts in the endoplasmic reticulum (ER) where a 14-sugar glycan composed of three glucoses, nine mannoses, and two N-acetylglucosamines (Glc(3)Man(9)GlcNAc(2)) is transferred to nascent proteins. The glucoses are sequentially trimmed by ER-resident glucosidases. The Glc(3)Man(9)GlcNAc(2) moiety is the substrate for oligosaccharyltransferase; the Glc(1)Man(9)GlcNAc(2) and Man(9)GlcNAc(2) intermediates are signals for glycoprotein folding and quality control in the calnexin/calreticulin cycle. Here, we report a novel membrane-anchored ER protein that is highly conserved in animals and that recognizes the Glc(2)-N-glycan. Structure determination by nuclear magnetic resonance showed that its luminal part is a carbohydrate binding domain that recognizes glucose oligomers. Carbohydrate microarray analyses revealed a uniquely selective binding to a Glc(2)-N-glycan probe. The localization, structure, and binding specificity of this protein, which we have named malectin, open the way to studies of its role in the genesis, processing and secretion of N-glycosylated proteins. Malectin: a novel carbohydrate-binding protein of the endoplasmic reticulum and a candidate player in the early steps of protein N-glycosylation.,Schallus T, Jaeckh C, Feher K, Palma AS, Liu Y, Simpson JC, Mackeen M, Stier G, Gibson TJ, Feizi T, Pieler T, Muhle-Goll C Mol Biol Cell. 2008 Aug;19(8):3404-14. Epub 2008 Jun 4. PMID:18524852 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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