Interaction of Insulin Receptor Substrate-1 with the ς3A Subunit of the Adaptor Protein Complex-3 in Cultured Adipocytes*

Interaction of Insulin Receptor Substrate-1 with the ς3A Subunit of the Adaptor Protein Complex-3 in Cultured Adipocytes*
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培养脂肪细胞中胰岛素受体底物 1 与衔接蛋白复合物 3 的 ς3A 亚基的相互作用*

DOI:
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发表时间:
1998
影响因子:
4.8
通讯作者:
R. Heller
R. Heller
中科院分区:
生物学2区
文献类型:
--
作者:
B. Vanrenterghem;M. Morin;M. Czech;R. Heller

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胰岛素受体酪氨酸激酶(insulin receptor tyrosine kinase, IRS-1)在胰岛素作用下的自磷酸化和随后底物蛋白(insulin receptor substrate-1, IRS-1)的酪氨酸磷酸化是胰岛素受体酪氨酸激酶的信号传导途径。在基础3T3-L1脂肪细胞中,IRS-1主要是膜结合的,这种定位可能对靶向介导胰岛素作用的下游信号元件很重要。由于IRS-1可能通过与特定膜蛋白的结合而定位到膜上,因此我们用非酪氨酸磷酸化的杆状病毒表达的IRS-1筛选3T3-F442A脂肪细胞cDNA表达文库,以鉴定潜在的IRS-1受体。一个编码AP-3接头蛋白复合物的小亚基(小亚基)的cDNA克隆被证明可以利用这种克隆策略与IRS-1结合。利用杆状病毒表达的IRS-1和谷胱甘肽s转移酶(GST)-阶梯3a融合蛋白进行体外结合研究,进一步验证了IRS-1与阶梯3a之间的特异性相互作用。从3T3-L1脂肪细胞中分离出的低密度膜,发现IRS-1和阶梯状细胞在耐洗涤剂的低密度膜中共分离。重要的是,在低密度膜上添加外源纯化的GST- 163a,几乎释放了所有结合在这些膜上的IRS-1,而单独使用GST没有效果。这些结果与假设一致,即阶梯3a作为IRS-1受体可能决定了IRS-1的亚细胞定位和信号功能。
Signaling through the insulin receptor tyrosine kinase involves its autophosphorylation in response to insulin and the subsequent tyrosine phosphorylation of substrate proteins such as insulin receptor substrate-1 (IRS-1). In basal 3T3-L1 adipocytes, IRS-1 is predominantly membrane-bound, and this localization may be important in targeting downstream signaling elements that mediate insulin action. Since IRS-1 localization to membranes may occur through its association with specific membrane proteins, a 3T3-F442A adipocyte cDNA expression library was screened with non-tyrosine-phosphorylated, baculovirus-expressed IRS-1 in order to identify potential IRS-1 receptors. A cDNA clone that encodes ς3A, a small subunit of the AP-3 adaptor protein complex, was demonstrated to bind IRS-1 utilizing this cloning strategy. The specific interaction between IRS-1 and ς3A was further verified by in vitro binding studies employing baculovirus-expressed IRS-1 and a glutathione S-transferase (GST)-ς3A fusion protein. IRS-1 and ς3A were found to co-fractionate in a detergent-resistant population of low density membranes isolated from basal 3T3-L1 adipocytes. Importantly, the addition of exogenous purified GST-ς3A to low density membranes caused the release of virtually all of the IRS-1 bound to these membranes, while GST alone had no effect. These results are consistent with the hypothesis that ς3A serves as an IRS-1 receptor that may dictate the subcellular localization and the signaling functions of IRS-1.
小鼠脂肪细胞中胰岛素诱导的 160 kDa 磷酸酪氨酸蛋白是胰岛素受体底物 1:通过克隆鉴定。
DOI: 10.1016/0167-4781(93)90222-y
发表时间: 1993
期刊: Biochimica et biophysica acta
影响因子: --
作者:
Keller,SR;Aebersold,R;Garner,CW;Lienhard,GE
通讯作者: Lienhard,GE
160,000 Da 磷酸酪氨酰蛋白的分离和表征,该蛋白是胰岛素信号传导的假定参与者。
DOI: --
发表时间: 1991
期刊: The Journal of biological chemistry
影响因子: --
作者:
Keller,SR;Kitagawa,K;Aebersold,R;Lienhard,GE;Garner,CW
通讯作者: Garner,CW
DOI: --
发表时间: 1992
期刊: The Journal of biological chemistry
影响因子: --
作者:
Kelly,KL;Ruderman,NB;Chen,KS
通讯作者: Chen,KS
蛋白质合成抑制剂可激活葡萄糖转运,而不增加 3T3-L1 脂肪细胞中质膜葡萄糖转运蛋白。
DOI: --
发表时间: 1991
期刊: The Journal of biological chemistry
影响因子: --
作者:
Clancy,BM;Harrison,SA;Buxton,JM;Czech,MP
通讯作者: Czech,MP
DOI: 10.1126/science.2904698
发表时间: 1988-12-09
期刊: SCIENCE
影响因子: 56.9
作者:
BRODSKY, FM
通讯作者: BRODSKY, FM