3b01

Crystal structure of the laminarinase catalytic domain from Thermotoga maritima MSB8

spinqualitylabelsall models 3b01, resolution 1.87Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3b01 is a 4 chain structure with sequence from Thema. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, CL, SO4 Related: 3azx, 3azy, 3azz, 3b00 Gene: TM_0024 (THEMA) Activity: Glucan endo-1,3-beta-D-glucosidase, with EC number 3.2.1.39 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Laminarinases hydrolyzing the beta-1,3-linkage of glucans play essential roles in microbial saccharide degradation. Here we report the crystal structures at 1.65-1.82 A resolution of the catalytic domain of laminarinase from the thermophile Thermotoga maritima with various space groups in the ligand-free form or in the presence of inhibitors gluconolactone and cetyltrimethylammonium. Ligands were bound at the cleft of the active site near an enclosure formed by Trp232 and a flexible GASIG loop. A closed configuration at the active site cleft was observed in some molecules. The loop flexibility in the enzyme may contribute to the regulation of endo- or exo-activity of the enzyme and a preference to release laminaritrioses in long chain carbohydrate hydrolysis. Glu137 and Glu132 are proposed to serve as the proton donor and nucleophile, respectively, in the retaining catalysis of hydrolyzation. Calcium ions in the crystallization media are found to accelerate crystal growth. Comparison of laminarinase and endoglucanase structures revealed the subtle difference of key residues in the active site for the selection of beta-1,3-glucan and beta-1,4-glucan substrates, respectively. Arg85 may be pivotal to beta-1,3 glucan substrate selection. The similarity of the structures between the laminarinase catalytic domain and its carbohydrate-binding (CBM) modules may have evolutionary relevance due to similarities in their folds. Crystal structures of the laminarinase catalytic domain from Thermotoga maritima MSB8 in complex with inhibitors: essential residues for beta-1,3 and beta-1,4 glucan selection.,Jeng WY, Wang NC, Lin CT, Shyur LF, Wang AH J Biol Chem. 2011 Nov 7. PMID:22065588 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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