The beta-glucuronidase catalyzed hydrolysis of a glucopyranosiduronamide and a glucopyranoside: evidence for the oxocarbonium ion mechanism for bovine liver beta-glucuronidase

Synthesis of sugar-lactams from azides of glucuronic acid

Sugar-lactams have found application as glycosidase inhibitors, synthetic precursors of iminosugars and they are structural components of natural products. The synthesis of beta-D-glucopyranosidurono-6,1-lactams from glucuronic acid derivatives are described. NMR data and X-ray crystal structures indicate that the sugar-lactams adopt distorted (1)C4 conformations in solution and in the solid state.

Purin-6-yl 6-deoxy-1-thio-beta-D-glucopyranoside. Enzymology, chemistry, and cytotoxicity

Purin-6-yl 6-deoxy-1-thio-beta-D-glucopyranoside (4) is a substrate for almond beta-glucosidase and a weak competitive inhibitor of bovine liver beta-D-glucuronidase (Ki approximately 20mM). Both 4 and purine-protonated 4 undergo hydrolysis catalyzed by dilute acid in the pH range 0.17-2.59. These results are compared with those previously obtained with ammonium (purin-6-yl 1-thio-beta-D-glucopyranosid)uronate, (purin-6-yl 1-thio-beta-D-glucopyranosid)uronamide, purin-6-yl 1-thio-beta-D-glucopyranoside, and purin-6-yl 2-deoxy-1-thio-beta-D-glucopyranoside, and it is concluded that the data support an involvement of substituents at C-5 in producing productive Michaelis-complex conformers. The 6-deoxyglucoside is more active than the D-glucosiduronic acid in an L1210 mouse screen.