1oa7

Structure of Melanocarpus albomyces endoglucanase in complex with cellobiose

spinqualitylabelsall models 1oa7, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1oa7 is a 1 chain structure with sequence from Melanocarpus albomyces. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: BGC Related: 1oa9 Activity: Cellulase, with EC number 3.2.1.4 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 Cellulose, a polysaccharide of beta-1,4-linked D-glucosyl units, is the major component of plant cell walls and one of the most abundant biopolymers in nature. Cellulases (cellobiohydrolases and endoglucanases) are enzymes that catalyse the hydrolysis of cellulose to smaller oligosaccharides, a process of paramount importance in biotechnology. The thermophilic fungus Melanocarpus albomyces produces a 20 kDa endoglucanase known as 20K-cellulase that has been found particularly useful in the textile industry. The crystal structures of free 20K-cellulase and its complex with cellobiose have been determined at 2.0 A resolution. The enzyme, classified into the glycoside hydrolase family 45, exhibits the characteristic six-stranded beta-barrel found before in Humicola insolens endoglucanase V structure. However, the active site in the 20K-cellulase shows a closing of approximately 2.5-3.5A while a mobile loop identified previously in Humicola insolens endoglucanase V and implicated in the catalytic mechanism is well-defined in 20K-cellulase. In addition, the crystal structure of the cellobiose complex shows a shift in the cellobiose position at the substrate-binding cleft. It is therefore proposed that these alterations may reflect differences in the binding mechanism and catalytic action of the enzyme. Crystal structure of a family 45 endoglucanase from Melanocarpus albomyces: mechanistic implications based on the free and cellobiose-bound forms.,Hirvonen M, Papageorgiou AC J Mol Biol. 2003 Jun 6;329(3):403-10. PMID:12767825 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Glucanase 3D structures

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