1daq

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

spinqualitylabelsall models 1daq 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 Acetivibrio thermocellus. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR Ligands: CA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function GUNS_ACETH This enzyme catalyzes the exohydrolysis of 1,4-beta-glucosidic linkages in cellulose with a preference for amorphous or crystalline cellulose over carboxymethyl cellulose. 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 3D structures

Proteopedia Page Contributors and Editors (what is this?)

OCA