Phosphatidylinositol 3,5-bisphosphate defines a novel PI 3-kinase pathway in resting mouse fibroblasts

Phosphatidylinositol 3,5-bisphosphate defines a novel PI 3-kinase pathway in resting mouse fibroblasts
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DOI:
10.1042/bj3230597
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发表时间:
1997-05-01
影响因子:
4.1
通讯作者:
Ulug, ET
Ulug, ET
中科院分区:
生物学3区
文献类型:
--
作者:
Whiteford, CC;Brearley, CA;Ulug, ET

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PtdIns(3,5)P-2 被鉴定为静息小鼠细胞中不依赖激动剂、对渥曼青霉素敏感的途径的产物。本文结果表明,PtdIns(3,5)P-2 是由 PtdIns3P 在 D-5 位点磷酸化形成的,并且表明 PtdIns3P 和 PtdIns(3,5)P-2 的相对恒定的细胞水平是通过 PtdIns3P 5-激酶和 PtdIns(3,5)P-2 5-磷酸酶的协同作用维持的。这些研究暗示了 PtdIns 特异性磷酸肌醇 3-羟基激酶在哺乳动物细胞中作用的新机制。
PtdIns(3,5)P-2 is identified as the product of an agonist-independent, wortmannin-sensitive pathway in resting mouse cells. Results are presented here to indicate that PtdIns(3,5)P-2 is formed by phosphorylation of PtdIns3P at the D-5 position, and they suggest that relatively constant cellular levels of PtdIns3P and PtdIns(3,5)P-2 are maintained by the concerted action of PtdIns3P 5-kinase and PtdIns(3,5)P-2 5-phosphatase. These studies imply a novel mechanism for the action of PtdIns-specific phosphoinositide 3-hydroxykinases in mammalian cells.