3wdv

The complex structure of PtLic16A with cellotetraose

spinqualitylabelsall models 3wdv, resolution 1.94Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3wdv is a 4 chain structure with sequence from Paecilomyces sp. 'thermophila'. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: BGC, CBI, SO4 Related: 3wdt, 3wdu, 3wdw, 3wdx, 3wdy Activity: Licheninase, with EC number 3.2.1.73 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The thermostable 1,3-1,4-beta-glucanase PtLic16A from the fungus Paecilomyces thermophila catalyzes stringent hydrolysis of barley beta-glucan and lichenan with an outstanding efficiency and has great potential for broad industrial applications. Here, we report the crystal structures of PtLic16A and an inactive mutant E113A in ligand-free form and in complex with the ligands cellobiose, cellotetraose and glucotriose at 1.80A to 2.25A resolution. PtLic16A adopts a typical beta-jellyroll fold with a curved surface and the concave face forms an extended ligand binding cleft. These structures suggest that PtLic16A might carry out the hydrolysis via retaining mechanism with E113 and E118 serving as the nucleophile and general acid/base, respectively. Interestingly, in the structure of E113A/1,3-1,4-beta-glucotriose complex, the sugar bound to the -1 subsite adopts an intermediate-like (alpha-anomeric) configuration. By combining all crystal structures solved here, a comprehensive binding mode for a substrate is proposed. These findings not only help understand the 1,3-1,4-beta-glucanase catalytic mechanism but also provide a basis for further enzymatic engineering. Structural and mutagenetic analyses of a 1,3-1,4-beta-glucanase from Paecilomyces thermophila.,Cheng YS, Huang CH, Chen CC, Huang TY, Ko TP, Huang JW, Wu TH, Liu JR, Guo RT Biochim Biophys Acta. 2014 Feb;1844(2):366-73. doi: 10.1016/j.bbapap.2013.11.005., Epub 2013 Nov 18. PMID:24262091 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Glucanase

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