4ni3 | pdb_00004ni3

Crystal Structure of GH29 family alpha-L-fucosidase from Fusarium graminearum in the closed form

spinqualitylabelsall models 4ni3, resolution 1.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ni3 is a 2 chain structure with sequence from Fusarium graminearum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: BMA, GOL, NA, NAG, TRS, MAN Gene: FCO1 (Fusarium graminearum) Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed The secreted glycoside hydrolase family 29 (GH29) alpha-L-fucosidase from plant pathogenic fungus Fusarium graminearum (FgFCO1) actively releases fucose from xyloglucan fragment. We solved crystal structures of two active-site conformations, ie., open and closed, of apo FgFCO1 and an open complex with product fucose at atomic resolution. The closed conformation supports catalysis by orienting the conserved general acid/base Glu 288 nearest the predicted glycosidic position, whereas the open conformation possibly represents an unreactive state with Glu 288 positioned away from the catalytic center. A flexible loop near the substrate binding site containing a non-conserved GGSFT sequence is ordered in the closed but not the open form. We also identified a novel C-terminal betagamma-crystallin domain in FgFCO1 devoid of calcium binding motif whose homologous sequences are present in various glycoside hydrolase families. N-glycosylated FgFCO1 adopts a monomeric state as verified by solution small angle X-ray scattering in contrast to reported multimeric fucosidases. Steady-state kinetics shows that FgFCO1 prefers alpha1,2 over alpha1,3/4-linkages and displays minimal activity with pNP-fucoside with an acidic pH optimum of 4.6. Despite a retaining GH29 family fold, the overall specificity of FgFCO1 most closely resembles inverting GH95 alpha-fucosidase which displays highest specificty with two natural substrates harboring Fucalpha1-2Gal glycosidic linkage, a xyloglucan-derived nonasaccharide and 2(prime)-fucosyllactose. Furthermore, FgFCO1 hydrolyzes H-disaccharide (lacking a +2 subsite sugar) at a rate 103-fold slower than 2(prime)-fucosyllactose. We demonstrated the structurally dynamic active site of FgFCO1 with flexible general acid/base Glu, a common feature shared by several bacterial GH29 fucosidases to various extents. Structure and substrate specificity of a eukaryotic fucosidase from Fusarium graminearum.,Cao H, Walton JD, Brumm P, Phillips GN Jr J Biol Chem. 2014 Aug 1. pii: jbc.M114.583286. PMID:25086049 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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