Membrane-associated phosphatidylinositol kinase from Saccharomyces cerevisiae.
Membrane-associated phosphatidylinositol kinase (ATP:phosphatidylinositol 4-phosphotransferase, EC 2.7.1.67) was partially purified 93-fold from Saccharomyces cerevisiae. Activity was dependent on magnesium ions (10 mM) and the optimum pH was 8.5. The apparent Km values for ATP and phosphatidylinositol were 0.21 mM and 71 microM, respectively. Activity was stimulated by sodium cholate and inhibited by sodium, potassium, lithium, and fluoride ions.
D019870:1-Phosphatidylinositol 4-Kinase; D000255:Adenosine Triphosphate / Q000378:metabolism; D019826:Cholic Acid; D002793:Cholic Acids / Q000494:pharmacology; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008274:Magnesium / Q000494:pharmacology; D015636:Magnesium Chloride; D008861:Microsomes / Q000201:enzymology; D010716:Phosphatidylinositols / Q000378:metabolism; D010770:Phosphotransferases / Q000302:isolation & purification / Q000378:metabolism*; D012441:Saccharomyces cerevisiae / Q000201:enzymology*; D029701:Saccharomyces cerevisiae Proteins
D002793:Cholic Acids; D010716:Phosphatidylinositols; D029701:Saccharomyces cerevisiae Proteins; D015636:Magnesium Chloride; D000255:Adenosine Triphosphate; D010770:Phosphotransferases; D019870:1-Phosphatidylinositol 4-Kinase; C441760:PIK1 protein, S cerevisiae; D019826:Cholic Acid; D008274:Magnesium