Differential modulations of KCNQ1 by auxiliary proteins KCNE1 and KCNE2.

Differential modulations of KCNQ1 by auxiliary proteins KCNE1 and KCNE2.
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辅助蛋白 KCNE1 和 KCNE2 对 KCNQ1 的差异调节

DOI:
10.1038/srep04973
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发表时间:
2014-05-15
期刊:
影响因子:
4.6
通讯作者:
Ding J
Ding J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Li P;Liu H;Lai C;Sun P;Zeng W;Wu F;Zhang L;Wang S;Tian C;Ding J

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KCNQ 1通道在心血管、胃等系统中发挥重要作用。KCNQ 1的电导和动力学可被不同的单跨膜螺旋辅助蛋白(如KCNE 1、KCNE 2等)调节。在这项研究中,详细的KCNQ 1功能的不同区域的KCNE 1或KCNE 2的调制检查使用组合的方法,电生理学,免疫荧光,溶液NMR和相关的骨干灵活性分析。在存在KCNE 2 N-末端的情况下,观察到KCNQ 1的表面表达降低和随后的低活性。KCNE 1和KCNE 2的跨膜结构域(TMD)以不同的方式与KCNQ 1通道结合:KCNE 2-TMD中的Ile 64与KCNQ 1中的Phe 340和Phe 275相互作用,而KCNQ 1/KCNE 1复合物中的两对相互作用残基(Phe 340-Thr 58和Ala 244-Tyr 65)相互作用。KCNE 1的C-末端可以调节KCNQ 1的门控特性,而KCNE 2的C-末端对KCNQ 1的门控特性影响很小。结果表明,两种辅助蛋白的不同区域对KCNQ 1的功能有不同的调节作用。
KCNQ1 channels play vital roles in cardiovascular, gastric and other systems. The conductance and dynamics of KCNQ1 could be modulated by different single transmembrane helical auxiliary proteins (such as KCNE1, KCNE2 and others). In this study, detail KCNQ1 function modulations by different regions of KCNE1 or KCNE2 were examined using combinational methods of electrophysiology, immunofluorescence, solution NMR and related backbone flexibility analysis. In the presence of KCNE2 N-terminus, decreased surface expression and consequent low activities of KCNQ1 were observed. The transmembrane domains (TMDs) of KCNE1 and KCNE2 were illustrated to associate with the KCNQ1 channel in different modes: Ile64 in KCNE2-TMD interacting with Phe340 and Phe275 in KCNQ1, while two pairs of interacting residues (Phe340-Thr58 and Ala244-Tyr65) in the KCNQ1/KCNE1 complex. The KCNE1 C-terminus could modulate gating property of KCNQ1, whereas KCNE2 C-terminus had only minimal influences on KCNQ1. All of the results demonstrated different KCNQ1 function modulations by different regions of the two auxiliary proteins.
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