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- W2772470501 abstract "Endo-1,3-β-glucanase from Cellulosimicrobium cellulans is composed of a catalytic domain and a carbohydrate-binding module. We have determined the X-ray crystal structure of the catalytic domain at a high resolution of 1.66Å. The overall fold is a sandwich-like β-jelly roll architecture like the enzymes in the glycoside hydrolase family 16. The substrate-binding cleft has a length and a width of ~28 and ~15Å, respectively, which is thought to be capable of accommodating at least six glucopyranose units. Laminarihexaose was placed into the substrate-binding cleft, namely at the subsites +2 to -4 from the reducing end, and the complex structure was analyzed using molecular dynamics simulations (MD) and using a rotamer search of the pocket. During the MD simulations, the substrate fluctuated more than the enzyme, where the residues at the subsites toward the non-reducing end fluctuated more than those toward the reducing end. Little conformational change of the protein was observed for the subsites +1 and +2, indicating that the glucose's position could be tightly restricted inside the pocket. Substrate binding experiments using isothermal titration calorimetry showed that the binding affinity of laminaritriose was higher than that of laminaribiose and similar to those of other longer laminarioligosaccharides. Taken together, the substrates mainly bind to the subsites -1 to -3 with the highest affinity, while the part bound to the reducing end would be hydrolyzed." @default.
- W2772470501 created "2017-12-22" @default.
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- W2772470501 date "2018-03-01" @default.
- W2772470501 modified "2023-09-23" @default.
- W2772470501 title "Structural and thermodynamic characterization of endo-1,3-β-glucanase: Insights into the substrate recognition mechanism" @default.
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- W2772470501 doi "https://doi.org/10.1016/j.bbapap.2017.12.004" @default.
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