Mutant of Insulin Receptor Substrate-1 Incapable of Activating Phosphatidylinositol 3-Kinase Did Not Mediate Insulin-stimulated Maturation of Xenopus laevis Oocytes*

Mutant of Insulin Receptor Substrate-1 Incapable of Activating Phosphatidylinositol 3-Kinase Did Not Mediate Insulin-stimulated Maturation of Xenopus laevis Oocytes*
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无法激活磷脂酰肌醇 3-激酶的胰岛素受体底物 1 突变体不介导胰岛素刺激的非洲爪蟾卵母细胞成熟*

DOI:
10.1074/jbc.271.45.28677
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发表时间:
1996
期刊:
The Journal of Biological Chemistry
影响因子:
--
通讯作者:
T. Kadowaki
T. Kadowaki
中科院分区:
--
文献类型:
--
作者:
R. Yamamoto;Z. Honda;K. Ueki;K. Tobe;Y. Kaburagi;Yoshihiko Takahashi;H. Tamemoto;Takeshi Suzuki;Kohji Itoh;Y. Akanuma;Y. Yazaki;T. Kadowaki

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胰岛素受体底物-1(IRS-1)是胰岛素对多种酪氨酸残基的快速磷酸化反应,并与几个含有Src同源2结构域的蛋白结合,从而启动下游信号转导。为了评估介导相关下游信号和生物学效应的酪氨酸磷酸化位点,我们创建了IRS-1的定点突变体,并在非洲爪哇卵母细胞中过表达。在过度表达IRS-1或IRS-1-895F(用苯丙氨酸取代Tyr-895)的卵母细胞中,胰岛素激活的磷脂酰肌醇(PI)3-激酶、p70 S6激酶和丝裂原激活的蛋白激酶可诱导卵母细胞成熟。相反,在高表达IRS-1-4F(用苯丙氨酸取代IRS-1的Tyr-460、Tyr-608、Tyr-939和Tyr-987)的卵母细胞中,胰岛素不能激活PI3-K、p70-S6和丝裂原活化蛋白激酶,也不能诱导卵母细胞成熟。这些观察结果表明,在高表达IRS-1的非洲血吸虫卵母细胞中,PI3-激酶而不是生长因子结合蛋白2(Grb2)与IRS-1的结合在胰岛素诱导的卵母细胞成熟中起主要作用。PI3-激酶的激活可能位于丝裂原激活的蛋白激酶和p70S6激酶对胰岛素的反应的上游。
Insulin receptor substrate-1 (IRS-1) is rapidly phosphorylated on multiple tyrosine residues in response to insulin and binds several Src homology 2 domain-containing proteins, thereby initiating downstream signaling. To assess the tyrosine phosphorylation sites that mediate relevant downstream signaling and biological effects, we created site-directed mutants of IRS-1 and overexpressed them in the Xenopus laevis oocyte. In oocytes overexpressing IRS-1 or IRS-1-895F (Tyr-895 replaced with phenylalanine), insulin activated phosphatidylinositol (PI) 3-kinase, p70 S6 kinase, and mitogen-activated protein kinase and induced oocyte maturation. In contrast, in oocytes overexpressing IRS-1-4F (Tyr-460, Tyr-608, Tyr-939, and Tyr-987 of IRS-1 replaced with phenylalanine), insulin did not activate PI 3-kinase, p70 S6 kinase, and mitogen-activated protein kinase and failed to induce oocyte maturation. These observations indicate that in X. laevis oocytes overexpressing IRS-1, the association of PI 3-kinase rather than Grb2 (growth factor-bound protein 2) with IRS-1 plays a major role in insulin-induced oocyte maturation. Activation of PI 3-kinase may lie upstream of mitogen-activated protein kinase activation and p70 S6 kinase activation in response to insulin.
磷脂酰肌醇 3-激酶在 Ras 和 Raf 上游发挥作用,介导胰岛素刺激 c-fos 转录。
DOI: --
发表时间: 1993
期刊: The Journal of biological chemistry
影响因子: --
作者:
Yamauchi,K;Holt,K;Pessin,JE
通讯作者: Pessin,JE
Ras、胰岛素受体底物 1 和具有 Src 同源 2 结构域的蛋白质在非洲爪蟾卵母细胞胰岛素信号传导中的相互作用。
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发表时间: 1994
期刊: The Journal of biological chemistry
影响因子: --
作者:
Chuang,LM;Hausdorff,SF;MyersJr,MG;White,MF;Birnbaum,MJ;Kahn,CR
通讯作者: Kahn,CR
DOI: 10.1016/s0021-9258(19)61974-5
发表时间: 1994-11
期刊: The Journal of biological chemistry
影响因子: --
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M. G. Myers;T. Grammer;Ling-mei Wang;X. Sun;J. Pierce;J. Blenis;M. White
通讯作者: M. G. Myers;T. Grammer;Ling-mei Wang;X. Sun;J. Pierce;J. Blenis;M. White
胰岛素受体底物 1 与含有 SH2 的磷酸酪氨酸磷酸酶 Syp 结合。
DOI: --
发表时间: 1993
期刊: The Journal of biological chemistry
影响因子: --
作者:
Kuhné,MR;Pawson,T;Lienhard,GE;Feng,GS
通讯作者: Feng,GS
DOI: 10.1073/pnas.90.11.5172
发表时间: 1993-06-01
影响因子: 11.1
作者:
CHUANG, LM;MYERS, MG;KAHN, CR
通讯作者: KAHN, CR