Purification of a phosphatidylinositol 4-phosphate kinase from bovine brain membranes.
A phosphatidylinositol 4-phosphate (PIP) kinase (EC 2.7.1.68) was purified from bovine brain membranes in a six-step procedure involving solubilization of the enzyme with 170 mM NaCl followed by chromatography on diethylaminoethyl-cellulose, phosphocellulose, Ultrogel AcA44, hydroxylapatite, and ATP-agarose. The enzyme preparation was nearly homogeneous and was purified 5,600-fold with a final specific activity of 85 nmol/min/mg of protein and a yield of 20%. Its molecular mass was 110 kilodaltons, as estimated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The enzyme was specific for PIP; phosphorylation of phosphatidylinositol and diacylglycerol was not observed.
Moritz
A
A
Center for Biomembranes and Lipid Enzymology, University of Utrecht, The Netherlands.
De Graan
P N
PN
Ekhart
P F
PF
Gispen
W H
WH
Wirtz
K W
KW
D000818:Animals; D001921:Brain / Q000201:enzymology*; D002417:Cattle; D002462:Cell Membrane / Q000201:enzymology; D002845:Chromatography; D002846:Chromatography, Affinity; D002848:Chromatography, DEAE-Cellulose; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D017886:Durapatite; D006882:Hydroxyapatites; D007700:Kinetics; D008970:Molecular Weight; D010770:Phosphotransferases / Q000302:isolation & purification* / Q000378:metabolism; D017853:Phosphotransferases (Alcohol Group Acceptor)
D006882:Hydroxyapatites; D017886:Durapatite; D010770:Phosphotransferases; D017853:Phosphotransferases (Alcohol Group Acceptor); C020077:1-phosphatidylinositol-4-phosphate 5-kinase