Structural basis for the modulation of the neuronal voltage-gated sodium channel NaV1.6 by calmodulin.

Structural basis for the modulation of the neuronal voltage-gated sodium channel NaV1.6 by calmodulin.
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DOI:
10.1038/srep02435
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发表时间:
2013
期刊:
影响因子:
4.6
通讯作者:
Sivaraman, J.
Sivaraman, J.
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Chichili, Vishnu Priyanka Reddy;Xiao, Yucheng;Seetharaman, J.;Cummins, Theodore R.;Sivaraman, J.

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神经元电压门控钠通道(NaV1.6)在沿着有髓鞘轴突传播动作电位中起重要作用。已知钙调素(CaM)通过与其IQ基序相互作用来调节NaV1.6的失活动力学。在这里,我们报告的apo-CaM:NaV1.6IQ基序的晶体结构,沿着功能研究。NaV1.6的IQ基序在与CaM的C-叶的相互作用中采用α-螺旋构象。CaM使用不同的残基与NaV1.6IQ基序相互作用,这取决于Ca 2+的存在或不存在。NaV1.6中的Arg 1902、Tyr 1904和Arg 1905被鉴定为在Ca 2+存在和不存在下的关键共同相互作用残基。用丙氨酸取代Arg 1902和Tyr 1904在体内电生理实验中显示出降低的NaV1.6失活速率。与其他CaM:NaV复合物相比,我们的研究结果揭示了CaM:NaV1.6的不同相互作用模式,并提供了对VGSC亚型特异性调节的结构见解。
The neuronal-voltage gated sodium channel (VGSC), NaV1.6, plays an important role in propagating action potentials along myelinated axons. Calmodulin (CaM) is known to modulate the inactivation kinetics of NaV1.6 by interacting with its IQ motif. Here we report the crystal structure of apo-CaM:NaV1.6IQ motif, along with functional studies. The IQ motif of NaV1.6 adopts an α-helical conformation in its interaction with the C-lobe of CaM. CaM uses different residues to interact with NaV1.6IQ motif depending on the presence or absence of Ca2+. Three residues from NaV1.6, Arg1902, Tyr1904 and Arg1905 were identified as the key common interacting residues in both the presence and absence of Ca2+. Substitution of Arg1902 and Tyr1904 with alanine showed a reduced rate of NaV1.6 inactivation in electrophysiological experiments in vivo. Compared with other CaM:NaV complexes, our results reveal a different mode of interaction for CaM:NaV1.6 and provides structural insight into the isoform-specific modulation of VGSCs.
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