7vt7

Crystal structure of CBM deleted MtGlu5 in complex with CBI

spinqualitylabelsall models 7vt7, resolution 1.53Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7vt7 is a 1 chain structure with sequence from Meiothermus taiwanensis WR-220. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.53Å Ligands: BGC, GOL, PRD_900005, TRP Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A399DY85_9DEIN Publication Abstract from PubMed Most known cellulase-associated carbohydrate-binding modules (CBMs) are attached to the N- or C-terminus of the enzyme or are expressed separately and assembled into multi-enzyme complexes (for example to form cellulosomes), rather than being an insertion into the catalytic domain. Here, by solving the crystal structure, it is shown that MtGlu5 from Meiothermus taiwanensis WR-220, a GH5-family endo-beta-1,4-glucanase (EC 3.2.1.4), has a bipartite architecture consisting of a Cel5A-like catalytic domain with a (beta/alpha)8 TIM-barrel fold and an inserted CBM29-like noncatalytic domain with a beta-jelly-roll fold. Deletion of the CBM significantly reduced the catalytic efficiency of MtGlu5, as determined by isothermal titration calorimetry using inactive mutants of full-length and CBM-deleted MtGlu5 proteins. Conversely, insertion of the CBM from MtGlu5 into TmCel5A from Thermotoga maritima greatly enhanced the substrate affinity of TmCel5A. Bound sugars observed between two tryptophan side chains in the catalytic domains of active full-length and CBM-deleted MtGlu5 suggest an important stacking force. The synergistic action of the catalytic domain and CBM of MtGlu5 in binding to single-chain polysaccharides was visualized by substrate modeling, in which additional surface tryptophan residues were identified in a cross-domain groove. Subsequent site-specific mutagenesis results confirmed the pivotal role of several other tryptophan residues from both domains of MtGlu5 in substrate binding. These findings reveal a way to incorporate a CBM into the catalytic domain of an existing enzyme to make a robust cellulase. Synergic action of an inserted carbohydrate-binding module in a glycoside hydrolase family 5 endoglucanase.,Ye TJ, Huang KF, Ko TP, Wu SH Acta Crystallogr D Struct Biol. 2022 May 1;78(Pt 5):633-646. doi:, 10.1107/S2059798322002601. Epub 2022 Apr 20. PMID:35503211 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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