Structural and energetic determinants of apo calmodulin binding to the IQ motif of the Na(V)1.2 voltage-dependent sodium channel.

Structural and energetic determinants of apo calmodulin binding to the IQ motif of the Na(V)1.2 voltage-dependent sodium channel.
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DOI:
10.1016/j.str.2011.02.009
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发表时间:
2011-05-11
期刊:
影响因子:
5.7
通讯作者:
Shea, Madeline A.
Shea, Madeline A.
中科院分区:
生物学2区
文献类型:
--
作者:
Feldkamp, Michael D.;Yu, Liping;Shea, Madeline A.

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神经元电压依赖性钠通道 (Nav1.2) 对于动作电位的产生和传播至关重要,由与其 α 亚基中的 IQ 基序结合的钙调蛋白 (CaM) 调节。代表IQ基序的肽(Nav1.2IQp,KRKQEEVSAIVIQRAYRRYLLKQKVKK)对apo CaM的亲和力比(Ca2+)4-CaM更高。关联仅由 CaM 的 C 结构域介导。用NMR确定与Nav1.2IQp结合的apo 13C,15N-CaM C-结构域的溶液结构(2KXW.pdb)。 Nav1.2IQp与CaM结合的区域呈螺旋状; R1902 是一种与家族性自闭症有关的 Nav1.2 残基,它不与 CaM 接触。该复合物中 CaM 的 apo C 结构域具有与肌球蛋白 V IQ 基序 (2IX7) 结合的相同结构域以及与不包含 IQ 基序的 SK 通道肽 (1G4Y) 结合的相同结构域的特征。 CaM-Nav1.2IQp 相互作用的热力学和结构研究表明,apo 和 (Ca2+)4-CaM 采用不同的构象,都允许在门控过程中与 Nav1.2IQp 紧密结合。
The neuronal voltage-dependent sodium channel (Nav1.2), essential for generation and propagation of action potentials, is regulated by calmodulin (CaM) binding to the IQ motif in its α-subunit. A peptide (Nav1.2IQp, KRKQEEVSAIVIQRAYRRYLLKQKVKK) representing the IQ motif had higher affinity for apo CaM than (Ca2+)4-CaM. Association was mediated solely by the C-domain of CaM. A solution structure (2KXW.pdb) of apo 13C,15N-CaM C-domain bound to Nav1.2IQp was determined with NMR. The region of Nav1.2IQp bound to CaM was helical; R1902, an Nav1.2 residue implicated in familial autism, did not contact CaM. The apo C-domain of CaM in this complex shares features of the same domain bound to myosin V IQ motifs (2IX7) and bound to an SK channel peptide (1G4Y) that does not contain an IQ motif. Thermodynamic and structural studies of CaM-Nav1.2IQp interactions show that apo and (Ca2+)4-CaM adopt distinct conformations that both permit tight association with Nav1.2IQp during gating.
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