Enzymatic glucosylation of dolichyl monophosphate formed via cytidine triphosphate in calf brain membranes.
When calf brain membrane preparations containing endogenous dolichyl [32P]monophosphate (Dol-32P), prelabeled enzymatically by [gamma-32P]-CTP, are incubated with unlabeled UDP-glucose, the formation of a mild acid-labile [32P]phosphoglucolipid is observed. The biosynthesis of the [32P]phosphoglucolipid is dependent on the concentration of UDP-glucose added, and no [32P]phosphoglycolipid appeared when UDP-glucose was replaced by ADP-glucose, UDP-xylose, UDP-galactose, UDP-mannose, or UDP-glucuronic acid. The 32P-labeled product formed by the UDP-glucose-dependent reaction is chemically and chromatographically identical to glucosylphosphoryldolichol. Several enzymatic parameters of the glucosylation of the specific pool of Dol-P, synthesized by the CTP-mediated kinase, and the total available pool of Dol-P have been compared by a double-label assay utilizing endogenous, prelabeled Dol-32P and UDP-[3H]glucose as substrates.
D000818:Animals; D001921:Brain / Q000378:metabolism*; D002417:Cattle; D002462:Cell Membrane / Q000378:metabolism; D003570:Cytidine Triphosphate / Q000378:metabolism*; D003597:Cytosine Nucleotides / Q000378:metabolism*; D004288:Dolichol Phosphates / Q000378:metabolism*; D005964:Glucosyltransferases / Q000378:metabolism*; D007700:Kinetics; D010761:Phosphorus Radioisotopes; D011106:Polyisoprenyl Phosphates / Q000378:metabolism*; D011865:Radioisotope Dilution Technique; D014316:Tritium; D014532:Uridine Diphosphate Glucose / Q000378:metabolism
D003597:Cytosine Nucleotides; D004288:Dolichol Phosphates; D010761:Phosphorus Radioisotopes; D011106:Polyisoprenyl Phosphates; D014316:Tritium; C028306:dolichol monophosphate; D003570:Cytidine Triphosphate; D005964:Glucosyltransferases; D014532:Uridine Diphosphate Glucose