Identification of a new 80 k isoform of phosphatidylinositol 4-phosphate 5-kinase from bovine brain.
Phosphatidylinositol 4-phosphate 5-kinase is associated with bovine brain microsomes to an extent of approximately 65% of the total cellular enzyme activity. This membrane-associated kinase activity can be solubilized with Triton X-114. Following polyacrylamide gel electrophoresis in the presence of SDS the enzyme can be renaturated from gel slices in the presence of desoxycholate and Triton X-100. Catalytic activity appears at an apparent molecular weight of 80 k. Analysis of the reaction product formed by the 80 k protein reveals the existence of a 5-phosphotransferase, identifying the 80 k polypeptide as a new phosphatidylinositol 4-phosphate 5-kinase isoform.
Abteilung für Biochemie Supramolekularer Systeme, Ruhr-Universität Bochum, Germany.
M
M
Schmidt
M
M
Varsányi
R
R
Thieleczek
L M
LM
Heilmeyer
D000818:Animals; D001921:Brain / Q000201:enzymology*; D002417:Cattle; D004591:Electrophoresis, Polyacrylamide Gel; D007527:Isoenzymes / Q000378:metabolism*; D007700:Kinetics; D010770:Phosphotransferases / Q000378:metabolism*; D017853:Phosphotransferases (Alcohol Group Acceptor)
D007527:Isoenzymes; D010770:Phosphotransferases; D017853:Phosphotransferases (Alcohol Group Acceptor); C020077:1-phosphatidylinositol-4-phosphate 5-kinase