Protein kinase C enhances human sodium channel hNav1.7 resurgent currents via a serine residue in the domain III-IV linker.

Protein kinase C enhances human sodium channel hNav1.7 resurgent currents via a serine residue in the domain III-IV linker.
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DOI:
10.1016/j.febslet.2014.09.011
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发表时间:
2014-11-03
期刊:
影响因子:
3.5
通讯作者:
Cummins TR
Cummins TR
中科院分区:
生物学3区
文献类型:
--
作者:
Tan ZY;Priest BT;Krajewski JL;Knopp KL;Nisenbaum ES;Cummins TR

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复苏的钠电流可能在调节神经元兴奋性方面发挥作用。在这里,我们研究了蛋白激酶C(PKC)激活是否可以增加由人钠通道hNav1.7产生的复活电流。我们发现,PKC激动剂显着增强hNav1.7介导的复苏电流,这是由PKC拮抗剂阻止。两个磷酸化模拟突变复制的增强效果,并防止在一个保守的PKC磷酸化位点(丝氨酸1479)的磷酸化缺陷突变。我们的研究结果表明,PKC可以通过磷酸化的保守丝氨酸残基位于域III-IV连接的钠通道增加钠复苏电流。
Resurgent sodium currents likely play a role in modulating neuronal excitability. Here we studied whether protein kinase C (PKC) activation can increase resurgent currents produced by the human sodium channel hNav1.7. We found that a PKC agonist significantly enhanced hNav1.7-mediated resurgent currents and this was prevented by PKC antagonists. The enhancing effects were replicated by two phosphorylation-mimicking mutations and were prevented by a phosphorylation-deficient mutation at a conserved PKC phosphorylation site (Serine 1479). Our results suggest that PKC can increase sodium resurgent currents through phosphorylation of a conserved Serine residue located in the domain III–IV linker of sodium channels.
DOI: 10.1523/jneurosci.5011-13.2014
发表时间: 2014-05-21
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