Pulsed electron spin resonance resolves the coordination site of Cu²(+) ions in α1-glycine receptor.

Pulsed electron spin resonance resolves the coordination site of Cu²(+) ions in α1-glycine receptor.
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脉冲电子自旋共振解决了α1-甘氨酸受体中Cu 2( ) 离子的配位位点。

DOI:
10.1016/j.bpj.2010.08.050
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发表时间:
2010
影响因子:
3.4
通讯作者:
Saxena,Sunil
Saxena,Sunil
中科院分区:
生物学3区
文献类型:
--
作者:
Ruthstein,Sharon;Stone,KatherineM;Cunningham,TimothyF;Ji,Ming;Cascio,Michael;Saxena,Sunil

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在这里,我们确定了Cu2+在人α1-甘氨酸受体(GlyR)中的配位环境。GlyRs是五聚体配基门控离子通道超家族(PLGIC)的成员,在突触中介导快速信号。锌和铜等金属离子显著调节pLGICs的活性,而金属离子的配位对于GlyR在体内适当的生理性突触后抑制是必不可少的。锌离子可增强或抑制GlyR活性,而Cu2+对GlyR活性有抑制作用。为了更好地了解抑制作用的分子基础,我们用电子自旋共振直接研究了Cu2+的配位和化学计量。我们证明了Cu2+在每个α1亚基上有一个结合位点,并且每个GlyR可以配位五个Cu2+。Cu2+与GlyR每个亚基上的E192和H215结合,表观解离常数为40μM,与早期的功能测量一致。然而,该配位不包括先前通过功能测量而被认为在Cu2+配位中起作用的几个激动剂/拮抗剂结合部位的残基。有趣的是,E192/H_215位被认为是增强锌离子的位点。这些阳离子在一个共同的结合部位的相反的调制作用突出了GlyR的敏感变构性质。
Herein, we identify the coordination environment of Cu2+in the humanα1-glycine receptor (GlyR). GlyRs are members of the pentameric ligand-gated ion channel superfamily (pLGIC) that mediate fast signaling at synapses. Metal ions like Zn2+and Cu2+significantly modulate the activity of pLGICs, and metal ion coordination is essential for proper physiological postsynaptic inhibition by GlyR in vivo. Zn2+can either potentiate or inhibit GlyR activity depending on its concentration, while Cu2+is inhibitory. To better understand the molecular basis of the inhibitory effect we have used electron spin resonance to directly examine Cu2+coordination and stoichiometry. We show that Cu2+has one binding site perα1 subunit, and that five Cu2+can be coordinated per GlyR. Cu2+binds to E192 and H215 in each subunit of GlyR with a 40μM apparent dissociation constant, consistent with earlier functional measurements. However, the coordination site does not include several residues of the agonist/antagonist binding site that were previously suggested to have roles in Cu2+coordination by functional measurements. Intriguingly, the E192/H215 site has been proposed as the potentiating Zn2+site. The opposing modulatory actions of these cations at a shared binding site highlight the sensitive allosteric nature of GlyR.
质子依赖性电子从 CuA 转移到血红素 a,并改变了细胞色素氧化酶血红素 a 附近突变体的 EPR 谱。
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