INS (1,3,4,5)P(4);
INS (1,4,5)P(3) 3-KINASE;
CALMODULIN;
HEPARIN;
ENZYME PURIFICATION;
RAT LIVER;
PYROPHOSPHATE;
D O I:
10.1016/0898-6568(92)90070-O
中图分类号:
Q2 [细胞生物学];
学科分类号:
071009 ;
090102 ;
摘要:
Rat liver inositol 1,4,5-trisphosphate [Ins (1,4,5)P3] 3-kinase was purified in high yield by a three-step procedure reliant upon chromatography on heparin and calmodulin agarose. Purified enzyme was' stable in the presence of the detergent 3-[(3-cholamidopropyl)-dimethylammonio]-1-propanesulphonate (CHAPS) (0.1-0.5%) and the sulphhydryl reducing reagent dithiothreitol (DTT). The purified enzyme was activated 2-3-fold by Ca2+ (1-mu-M) in the presence of calmodulin. Pyrophosphate and heparin were identified as inhibitors of the enzyme.