RELATIONSHIP BETWEEN PHOSPHOINOSITIDE KINASE-ACTIVITIES AND PROTEIN TYROSINE PHOSPHORYLATION IN PLASMA-MEMBRANES FROM A431 CELLS

被引:47
作者
PAYRASTRE, B
PLANTAVID, M
BRETON, M
CHAMBAZ, E
CHAP, H
机构
[1] HOP PURPAN,INSERM,U326,F-31059 TOULOUSE,FRANCE
[2] CEN,INSERM,U244,BRCE,LBIO,F-38041 GRENOBLE,FRANCE
关键词
D O I
10.1042/bj2720665
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Production of PtdIns(4) P and PtdIns(4,5)P2 by plasma-membrane preparations from A431 cells was selectively stimulated in a dose-dependent manner by epidermal growth factor (EGF) in the presence of Na3VO4. Na3 VO4 itself mimicked this effect, which was overcome after treatment by a specific phosphotyrosyl phosphatase isolated from A431 cells. PtdIns and PtdIns(4) P kinase activities were present in phosphotyrosyl-proteins isolated from EGF- and/or Na3VO4-stimulated A431 cells by immunoaffinity using an anti-phosphotyrosine antibody. These data suggest for the first time an EGF-dependent regulation of PtdIns 4-kinase and PtdIns(4) P 5-kinase activities by a mechanism involving a tyrosinephosphorylation process.
引用
收藏
页码:665 / 670
页数:6
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