1gw1

Substrate distortion by beta-mannanase from Pseudomonas cellulosa

spinqualitylabelsall models 1gw1, resolution 1.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1gw1 is a 1 chain structure with sequence from Cellvibrio japonicus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.65Å Ligands: BMA, MAF, MBF, NA, NIN, TRS, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function MANA_CELJU Hydrolyzes mannan and galactomannan, but displays little activity towards other polysaccharides located in the plant cell wall. Appears to act in synergy with alpha-galactosidase (AgaA) to elicit hydrolysis of galactomannan. Preferentially hydrolyzes the larger oligosaccharides and has greater activity against non-substituted polysaccharides. 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 crystal structure of Pseudomonas cellulosa mannanase 26A has been solved by multiple isomorphous replacement and refined at 1.85 A resolution to an R-factor of 0.182 (R-free = 0.211). The enzyme comprises (beta/alpha)(8)-barrel architecture with two catalytic glutamates at the ends of beta-strands 4 and 7 in precisely the same location as the corresponding glutamates in other 4/7-superfamily glycoside hydrolase enzymes (clan GH-A glycoside hydrolases). The family 26 glycoside hydrolases are therefore members of clan GH-A. Functional analyses of mannanase 26A, informed by the crystal structure of the enzyme, provided important insights into the role of residues close to the catalytic glutamates. These data showed that Trp-360 played a critical role in binding substrate at the -1 subsite, whereas Tyr-285 was important to the function of the nucleophile catalyst. His-211 in mannanase 26A does not have the same function as the equivalent asparagine in the other GH-A enzymes. The data also suggest that Trp-217 and Trp-162 are important for the activity of mannanase 26A against mannooligosaccharides but are less important for activity against polysaccharides. Crystal structure of mannanase 26A from Pseudomonas cellulosa and analysis of residues involved in substrate binding.,Hogg D, Woo EJ, Bolam DN, McKie VA, Gilbert HJ, Pickersgill RW J Biol Chem. 2001 Aug 17;276(33):31186-92. Epub 2001 May 29. PMID:011382747 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Mannosidase 3D structures

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