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CRYSTAL STRUCTURE OF THE CATALYTIC DOMAIN OF A THERMOPHILIC ENDOCELLULASE

spinqualitylabelsall models 1tml, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1tml is a 1 chain structure with sequence from Thermobifida fusca. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.8Å Ligands: SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function GUN2_THEFU 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 One way to improve the economic feasibility of biomass conversion is to enhance the catalytic efficiency of cellulases through protein engineering. This requires that high-resolution structures of cellulases be available. Here we present the structure of E2cd, the catalytic domain of the thermophilic endocellulase E2 from Thermomonospora fusca, as determined by X-ray crystallography. The structure was solved by multiple isomorphous replacement at 2.6-A resolution and has been refined at 1.8-A resolution to an R-value of 18.4% for all reflections between 10- and 1.8-A resolution. The fold of E2cd is based on an unusual parallel beta-barrel and is equivalent to the fold determined for the catalytic domain of cellobiohydrolase II, an exocellulase from Trichoderma reesei [Rouvinen et al. (1990) Science 249, 380-385]. The active site cleft of the enzyme, approximately 11 A deep and running the entire length of the molecule, is seen to be completely free for ligand binding in the crystal. A 2.2-A resolution analysis of crystals of E2cd complexed with cellobiose, an inhibitor, shows how cellobiose binds in the active site and interacts with several residues which line the cleft. Catalytic roles are suggested for three aspartic acid residues at the active site. A comparison of the E2cd and CBHIIcd structures reveals a large difference in their active site accessibilities and supports the hypothesis that the main difference between endo- and exocellulases is the degree to which their active sites are accessible to substrate. Crystal structure of the catalytic domain of a thermophilic endocellulase.,Spezio M, Wilson DB, Karplus PA Biochemistry. 1993 Sep 28;32(38):9906-16. PMID:8399160 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Glucanase 3D structures

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