Dietary effects on the formation of dolichyl monophosphate mannose by microsomal preparations of rat adiopose tissue.
Microsomal preparations from rat adipose tissue catalyse the transfer of [(14)C]mannose from GDP-[(14)C]mannose to an endogenous acceptor forming a [(14)C]mannosyl lipid. The mannosyl lipid co-chromatographs with hen oviduct dolichyl monophosphate beta-mannose on three solvent systems. It is stable to mild alkaline hydrolysis, but strong alkaline treatment yields a compound that co-migrates with mannose 1-phosphate. The mannosyl lipid is labile to mild acid hydrolysis, yielding [(14)C]mannose. Formation of the compound is reversible by GDP, but not GMP, and is stimulated by exogenous dolichyl phosphate. The kinetics of transfer of [(14)C]mannose from GDP-[(14)C]mannose to form dolichyl monophosphate mannose were studied by using preparations derived from rats fed on one of four diets: G (high glucose), L (high lard), F (fructose) or GC (high glucose, 0.9% cholesterol). The K(m) and V(max.) values for transfer from GDP-mannose were virtually indistinguishable in the four preparations.In the absence of exogenous dolichyl phosphate, the largest amount of transfer of [(14)C]mannose into the mannosyl lipid was observed with preparations from fructose-fed animals. Preparations from glucose-fed animals showed about 60% as much transfer, whereas membranes from rats fed the other diets showed intermediate values between the fructose- and glucose-fed animals. The inclusion of cholesterol in the glucose diet elicited an increase in transfer of mannose. Under conditions of saturating exogenous dolichyl phosphate, preparations from lard-fed animals have 1.5 times as much enzyme activity as do preparations from animals fed the other three diets.
D000273:Adipose Tissue / Q000187:drug effects / Q000378:metabolism*; D000818:Animals; D002791:Cholesterol, Dietary / Q000494:pharmacology; D004040:Dietary Carbohydrates / Q000494:pharmacology*; D004041:Dietary Fats / Q000494:pharmacology*; D004287:Dolichol Monophosphate Mannose / Q000096:biosynthesis* / Q000302:isolation & purification; D004288:Dolichol Phosphates / Q000494:pharmacology; D005632:Fructose / Q000494:pharmacology; D005947:Glucose / Q000494:pharmacology; D006868:Hydrolysis; D007700:Kinetics; D008297:Male; D008861:Microsomes / Q000187:drug effects / Q000378:metabolism; D011105:Polyisoprenyl Phosphate Sugars / Q000096:biosynthesis*; D051381:Rats
D002791:Cholesterol, Dietary; D004040:Dietary Carbohydrates; D004041:Dietary Fats; D004288:Dolichol Phosphates; D011105:Polyisoprenyl Phosphate Sugars; D005632:Fructose; D004287:Dolichol Monophosphate Mannose; D005947:Glucose