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- W4386996910 abstract "Cellobiose phosphorylase (CBP) catalyzes the reversible phosphorolysis of cellobiose into α-glucose 1-phosphate and glucose. A CBP with a broadened substrate specificity would be more desirable when utilized to convert cellulose into amylose (PNAS, 110: 7182-7187, 2013) and to construct yeast that can phosphorolytically use cellodextrin to produce ethanol. Based on the structure differences in the catalytic loops of CBP and cellodextrin phosphorylase from Clostridium thermocellum (named CtCBP and CtCDP, respectively), CtCBP was mutated to change its substrate specificity. A single-site mutant S497G was identified to exhibit a 5.7-fold higher catalytic efficiency with cellotriose as a substrate in the phosphorolytic reaction compared to the wild type, without any loss of catalytic efficiency on its natural substrate, cellobiose. When the S497G variant was used in the transformation of mixed cellodextrin (cellobiose + cellotriose) to amylose, the amylose yield was significantly increased compared to that of wild-type CtCBP. A structure change in the substrate-binding pocket of the S497G variant accounted for its capacity to accept longer cellodextrins than cellobiose. Taken together, the modified CtCBP, S497G was confirmed to acquire a promising feature favorable to those application scenarios involving cellodextrin's phosphorolysis." @default.
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- W4386996910 date "2023-09-22" @default.
- W4386996910 modified "2023-10-17" @default.
- W4386996910 title "Broadening the Substrate Specificity of Cellobiose Phosphorylase from Clostridium thermocellum for Improved Transformation of Cellodextrin to Starch" @default.
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- W4386996910 doi "https://doi.org/10.3390/ijms241914452" @default.
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