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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Kinase interaction domain of kinase-associated protein phosphatyase, a phosphoprotein-binding domain
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Kinase interaction domain of kinase-associated protein phosphatyase, a phosphoprotein-binding domain

机译:激酶相关蛋白磷酸酶的激酶相互作用域,一种磷酸蛋白结合域

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摘要

Kinase-associated protein phosphatase in teracts specifically with plant receptor-like protein kinases. This interation is thought to be a key step in signal perception and transduction. The minimal kinase interaction(ki) domain of kinase-associated protein phosphatase was mapped to a 119-aa segment spanning residues 180 t0 298. A forkhead-associated (FHA) homology region resides in this minimal KI domain. Site-directed mutagenesis of four highly conserved sites in this FHA homology region abolishes the KI domain's interaction with receptor-like protein kinases, indicating that the FHA region is esential for binding. Serial deletion analysis indicates that 30 aa on each side of the FHA region are also needed for binding; this minimal functional unit is designated as the KI domain. Kinetic studies using surface plasmon resonance indicate that the binding between the KI domain and receptor-like protein kinases has a dissociation constant (kd) of about 25-100 nM, which is similar to the binding affinity of two other well characterized phosphorylation-dependent protein-binding domains (14-3-3 and Src homology 2) and their high-affinity phosphopeptide ligands.
机译:激酶相关的蛋白磷酸酶特异与植物受体样蛋白激酶接触。这种相互作用被认为是信号感知和转导的关键步骤。激酶相关蛋白磷酸酶的最小激酶相互作用(ki)结构域定位到跨残基180 t0 298的119-aa区段。叉头相关(FHA)同源性区域位于此最小KI域中。在该FHA同源区域中四个高度保守的位点的定点诱变消除了KI域与受体样蛋白激酶的相互作用,表明FHA区对于结合至关重要。序列缺失分析表明,FHA区每侧需要30个氨基酸进行结合;该最小功能单元被称为KI域。使用表面等离振子共振的动力学研究表明,KI结构域与受体样蛋白激酶之间的结合具有约25-100 nM的解离常数(kd),这与其他两种表征良好的磷酸化依赖性蛋白的结合亲和力相似-结合结构域(14-3-3和Src同源性2)及其高亲和力磷酸肽配体。

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