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- W2031502120 abstract "Cellobiose phosphorylase from Cellulomonas uda (CuCPase) is shown to utilize D-glucal as slow alternative donor substrate for stereospecific glycosyl transfer to inorganic phosphate, giving 2-deoxy-α-D-glucose 1-phosphate as the product. When performed in D(2)O, enzymatic phosphorolysis of D-glucal proceeds with incorporation of deuterium in equatorial position at C-2, implying a stereochemical course of reaction where substrate becomes protonated from below its six-membered ring through stereoselective re side attack at C-2. The proposed catalytic mechanism, which is supported by results of docking studies, involves direct protonation of D-glucal by the enzyme-bound phosphate, which then performs nucleophilic attack on the reactive C-1 of donor substrate. When offered D-glucose next to D-glucal and phosphate, CuCPase produces 2-deoxy-β-D-glucosyl-(1→4)-D-glucose and 2-deoxy-α-D-glucose 1-phosphate in a ratio governed by mass action of the two acceptor substrates present. Enzymatic synthesis of 2-deoxy-β-D-glucosyl-(1→4)-D-glucose is effectively promoted by catalytic concentrations of phosphate, suggesting that catalytic reaction proceeds through a quaternary complex of CuCPase, D-glucal, phosphate, and D-glucose. Conversion of D-glucal and phosphate presents a convenient single-step synthesis of 2-deoxy-α-D-glucose 1-phosphate that is difficult to prepare chemically." @default.
- W2031502120 created "2016-06-24" @default.
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- W2031502120 date "2012-07-01" @default.
- W2031502120 modified "2023-09-23" @default.
- W2031502120 title "Examining the role of phosphate in glycosyl transfer reactions of Cellulomonas uda cellobiose phosphorylase using d-glucal as donor substrate" @default.
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- W2031502120 doi "https://doi.org/10.1016/j.carres.2012.04.003" @default.
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