title: Activation of liver alcohol dehydrogenase by glycosylation.
abstract: D-Fructose and D-glucose activate alcohol dehydrogenase from horse liver to oxidize ethanol. One mol of D-[U-14C]fructose or D-[U-14C]glucose is covalently incorporated per mol of the maximally activated enzyme. Amino acid and N-terminal analyses of the 14C-labelled glycopeptide isolated from a proteolytic digest of the [14C]glycosylated enzyme implicate lysine-315 as the site of the glycosylation. 13C-n.m.r.-spectroscopic studies indicate that D-[13C]glucose is covalently linked in N-glucosidic and Amadori-rearranged structures in the [13C]glucosylated alcohol dehydrogenase. Experimental results are consistent with the formation of the N-glycosylic linkage between glycose and lysine-315 of liver alcohol dehydrogenase in the initial step that results in an enhanced catalytic efficiency to oxidize ethanol.
mesh_terms: D000426:Alcohol Dehydrogenase; D000429:Alcohol Oxidoreductases / Q000378:metabolism*; D000818:Animals; D004590:Electrophoresis, Paper; D004789:Enzyme Activation / Q000187:drug effects; D005632:Fructose / Q000494:pharmacology*; D005947:Glucose / Q000494:pharmacology*; D006020:Glycopeptides / Q000032:analysis; D006736:Horses; D008099:Liver / Q000201:enzymology*; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical
chemical_list: D006020:Glycopeptides; D005632:Fructose; D000429:Alcohol Oxidoreductases; D000426:Alcohol Dehydrogenase; D005947:Glucose