Active site profiling reveals coupling between domains in SRC-family kinases.

Active site profiling reveals coupling between domains in SRC-family kinases.
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DOI:
10.1038/nchembio.1118
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发表时间:
2013-01
影响因子:
14.8
通讯作者:
--
中科院分区:
生物学1区
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--
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蛋白激酶是细胞内信号转导的关键调节因子,已成为一类重要的药物靶点。促进蛋白激酶活性位点的功能询问的化学蛋白质组学工具是用于研究这个大酶家族的调节和用于进行抑制剂选择性筛选的有力试剂。在这里,我们描述了一种新的交联策略,使裂解物和活细胞中的蛋白激酶活性位点的快速和定量分析。将这种方法应用于SRC家族激酶(SFKs)SRC和HCK,导致鉴定出一系列构象特异性ATP竞争性抑制剂,这些抑制剂对这些激酶的自抑制形式表现出明显的偏好。此外,我们表明,证明这种选择性的配体能够调节SRC和HCK的调节结构域的能力,从事分子间结合相互作用。这些研究提供了深入了解这个重要的酪氨酸激酶家族的调节。
Protein kinases, key regulators of intracellular signal transduction, have emerged as an important class of drug targets. Chemical proteomic tools that facilitate the functional interrogation of protein kinase active sites are powerful reagents for studying the regulation of this large enzyme family and for performing inhibitor selectivity screens. Here we describe a new crosslinking strategy that enables rapid and quantitative profiling of protein kinase active sites in lysates and live cells. Applying this methodology to the SRC-family kinases (SFKs) SRC and HCK led to the identification of a series of conformation-specific, ATP-competitive inhibitors that display a distinct preference for autoinhibited forms of these kinases. Furthermore, we show that ligands that demonstrate this selectivity are able to modulate the ability of the regulatory domains of SRC and HCK to engage in intermolecular binding interactions. These studies provide insight into the regulation of this important family of tyrosine kinases.
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