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- W97663498 abstract "Glucocerebrosidase, the lysosomal enzyme that is deficient in patients with Gaucher's disease, hydrolyses non-physiological aryl beta-D-glucosides and glucocerebroside, its substrate in vivo. We document that 2,3,-di-O-tetradecyl-1-O-(beta-D-glucopyranosyl)-sn-glycerol (2,3,-di-14:0-beta-Glc-DAG) inhibits human placental glucocerebrosidase activity in vitro (Ki 0.18 mM), and the nature of inhibition is typical of a mixed-type pattern. Furthermore, 2,3-di-14:0-beta-Glc-DAG was shown to be an excellent substrate for the lysosomal beta-glucosidase (Km 0.15 mM; Vmax. 19.8 units/mg) when compared with the natural substrate glucocerebroside (Km 0.080 mM; Vmax. 10.4 units/mg). The observations that (i) glucocerebrosidase-catalysed hydrolysis of 2,3-di-14:0-beta-Glc-DAG is inhibited by conduritol B epoxide and glucosylsphingosine, and (ii) spleen and brain extracts from patients with Gaucher's disease are unable to hydrolyse 2,3-di-14:O-beta-Glc-DAG demonstrate that the same active site on the enzyme is responsible for catalysing the hydrolysis of 4-methylumbelliferyl beta-D-glucopyranoside, glucocerebroside and 2,3-di-14:O-beta-Glc-DAG. With the aid of computer modelling we have established that the oxygen atoms in 2,3-DAG-Glc at the C-1, C-4*, C-5* (the ring oxygen in glucose) and C-2 positions correspond topologically to the oxygens at C-1, C-4* and C-5* and the nitrogen atom attached to C-2 respectively in glucocerebroside (* signifies a carbon atom in glucose); furthermore, all of the distances with respect to overlap of corresponding heteroatoms range from 0.02 A to 0.77 A (0.002-0.077 nm). A root-mean-square deviation of 0.31 A (0.031 nm) was obtained when the energy-minimized structures of 2,3-di-14:O-beta-Glc-DAG and glucocerebroside were compared using the latter four heteroatom co-ordinates." @default.
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- W97663498 date "1991-03-01" @default.
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- W97663498 title "2,3-di-O-tetradecyl-1-O-(β-d-glucopyranosyl)-sn-glycerol is a substrate for human glucocerebrosidase" @default.
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- W97663498 doi "https://doi.org/10.1042/bj2740557" @default.
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