Structure and interactions of PAS kinase N-terminal PAS domain: Model for intramolecular kinase regulation

Structure and interactions of PAS kinase N-terminal PAS domain: Model for intramolecular kinase regulation
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DOI:
10.1016/s0969-2126(02)00857-2
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发表时间:
2002-10-01
期刊:
影响因子:
5.7
通讯作者:
Gardner, KH
Gardner, KH
中科院分区:
生物学2区
文献类型:
--
作者:
Amezcua, CA;Harper, SM;Gardner, KH

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PAS 结构域是信号转导蛋白中的感觉模块,控制对各种环境刺激的反应。为了研究这些结构域如何调节真核激酶,我们使用溶液 NMR 方法研究了人 PAS 激酶 N 末端 PAS 结构域的结构和结合相互作用。虽然该域采用了特征性的 PAS 折叠,但两个区域的解决方案异常灵活。其中一个充当门户,允许小有机化合物进入结构域的核心,而另一个则结合并抑制同一蛋白质内的激酶结构域。点突变体的结构和功能分析表明,化合物和配体结合区域是相连的,这表明 PAS 结构域充当该真核信号系统的配体调节开关。
PAS domains are sensory modules in signal-transducing proteins that control responses to various environmental stimuli. To examine how those domains can regulate a eukaryotic kinase, we have studied the structure and binding interactions of the N-terminal PAS domain of human PAS kinase using solution NMR methods. While this domain adopts a characteristic PAS fold, two regions are unusually flexible in solution. One of these serves as a portal that allows small organic compounds to enter into the core of the domain, while the other binds and inhibits the kinase domain within the same protein. Structural and functional analyses of point mutants demonstrate that the compound and ligand binding regions are linked, suggesting that the PAS domain serves as a ligand-regulated switch for this eukaryotic signaling system.