1yna

ENDO-1,4-BETA-XYLANASE, ROOM TEMPERATURE, PH 4.0

spinqualitylabelsall models 1yna, resolution 1.55Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1yna is a 1 chain structure with sequence from Thermomyces lanuginosus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. NonStd Res: PCA Activity: Endo-1,4-beta-xylanase, with EC number 3.2.1.8 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 The crystal structure of the thermostable xylanase from Thermomyces lanuginosus was determined by single-crystal X-ray diffraction. The protein crystallizes in space group P21, a = 40.96(4) A, b = 52. 57(5) A, c = 50.47 (5) A, beta = 100.43(5) degrees, Z = 2. Diffraction data were collected at room temperature for a resolution range of 25-1.55 A, and the structure was solved by molecular replacement with the coordinates of xylanase II from Trichoderma reesei as a search model and refined to a crystallographic R-factor of 0.155 for all observed reflections. The enzyme belongs to the family 11 of glycosyl hydrolases [Henrissat, B., and Bairoch, A. (1993) Biochem. J. 293, 781-788]. pKa calculations were performed to assess the protonation state of residues relevant for catalysis and enzyme stability, and a heptaxylan was fitted into the active-site groove by homology modeling, using the published crystal structure of a complex between the Bacillus circulans xylanase and a xylotetraose. Molecular dynamics indicated the central three sugar rings to be tightly bound, whereas the peripheral ones can assume different orientations and conformations, suggesting that the enzyme might also accept xylan chains which are branched at these positions. The reasons for the thermostability of the T. lanuginosus xylanase were analyzed by comparing its crystal structure with known structures of mesophilic family 11 xylanases. It appears that the thermostability is due to the presence of an extra disulfide bridge, as well as to an increase in the density of charged residues throughout the protein. Thermophilic xylanase from Thermomyces lanuginosus: high-resolution X-ray structure and modeling studies.,Gruber K, Klintschar G, Hayn M, Schlacher A, Steiner W, Kratky C Biochemistry. 1998 Sep 29;37(39):13475-85. PMID:9753433 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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