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Role of IRS-2 in insulin and cytokine signalling.

机译:IRS-2在胰岛素和细胞因子信号传导中的作用。

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摘要

The protein IRS-1 acts as an interface between signalling proteins with Src-homology-2 domains (SH2 proteins) and the receptors for insulin, IGF-1, growth hormone, several interleukins (IL-4, IL-9, IL-13) and other cytokines. It regulates gene expression and stimulates mitogenesis, and appears to mediate insulin/IGF-1-stimulated glucose transport. Thus, survival of the IRS-1-/- mouse with only mild resistance to insulin was surprising. This dilemma is provisionally resolved with our discovery of a second IRS-signalling protein. We purified and cloned a likely candidate called 4PS from myeloid progenitor cells and, because of its resemblance to IRS-1, we designate it IRS-2. Alignment of the sequences of IRS-2 and IRS-1 revealed a highly conserved amino terminus containing a pleckstrin-homology domain and a phosphotyrosine-binding domain, and a poorly conserved carboxy terminus containing several tyrosine phosphorylation motifs. IRS-2 is expressed in many cells, including tissues from IRS-1-/- mice, and may be essential for signalling by several receptor systems.
机译:IRS-1蛋白充当具有Src-homology-2域的信号蛋白(SH2蛋白)与胰岛素,IGF-1,生长激素,几种白介素(IL-4,IL-9,IL-13)的受体之间的接口)和其他细胞因子。它调节基因表达并刺激有丝分裂,并似乎介导胰岛素/ IGF-1刺激的葡萄糖转运。因此,仅具有对胰岛素的轻度抵抗的IRS-1-/-小鼠的存活是令人惊讶的。通过我们发现第二种IRS信号转导蛋白,暂时解决了这一难题。我们从髓样祖细胞中纯化并克隆了一种可能的候选物,称为4PS,并且由于其与IRS-1类似,我们将其命名为IRS-2。 IRS-2和IRS-1序列的比对揭示了一个高度保守的氨基末端,其包含一个pleckstrin同源域和一个磷酸酪氨酸结合域,以及一个保守度较差的羧基末端,其包含多个酪氨酸磷酸化基序。 IRS-2在许多细胞中表达,包括来自IRS-1-/-小鼠的组织,并且可能是多种受体系统发出信号所必需的。

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