1daq

SOLUTION STRUCTURE OF THE TYPE I DOCKERIN DOMAIN FROM THE CLOSTRIDIUM THERMOCELLUM CELLULOSOME (MINIMIZED AVERAGE STRUCTURE)

spinqualitylabelsall models 1daq, 1 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1daq is a 1 chain structure with sequence from Atcc 27405. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA Related: 1dav Activity: Cellulase, with EC number 3.2.1.4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum Function [GUNS_CLOTM] This enzyme catalyzes the endohydrolysis of 1,4-beta-glucosidic linkages in cellulose, lichenin and cereal beta-D-glucans. 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 type I dockerin domain is responsible for incorporating its associated glycosyl hydrolase into the bacterial cellulosome, a multienzyme cellulolytic complex, via its interaction with a receptor domain (cohesin domain) of the cellulosomal scaffolding subunit. The highly conserved dockerin domain is characterized by two Ca(2+)-binding sites with sequence similarity to the EF-hand motif. Here, we present the three-dimensional solution structure of the 69 residue dockerin domain of Clostridium thermocellum cellobiohydrolase CelS. Torsion angle dynamics calculations utilizing a total of 728 NOE-derived distance constraints and 79 torsion angle restraints yielded an ensemble of 20 structures with an average backbone r.m.s.d. for residues 5 to 29 and 32 to 66 of 0.54 A from the mean structure. The structure consists of two Ca(2+)-binding loop-helix motifs connected by a linker; the E helices entering each loop of the classical EF-hand motif are absent from the dockerin domain. Each dockerin Ca(2+)-binding subdomain is stabilized by a cluster of buried hydrophobic side-chains. Structural comparisons reveal that, in its non-complexed state, the dockerin fold displays a dramatic departure from that of Ca(2+)-bound EF-hand domains. A putative cohesin-binding surface, comprised of conserved hydrophobic and basic residues, is proposed, providing new insight into cellulosome assembly. Solution structure of a type I dockerin domain, a novel prokaryotic, extracellular calcium-binding domain.,Lytle BL, Volkman BF, Westler WM, Heckman MP, Wu JH J Mol Biol. 2001 Mar 30;307(3):745-53. PMID:11273698 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Glucanase

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