Sensitivity to voltage-independent inhibition determined by pore-lining region of the acetylcholine receptor.

Sensitivity to voltage-independent inhibition determined by pore-lining region of the acetylcholine receptor.
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对电压非依赖性抑制的敏感性由乙酰胆碱受体的孔衬区域决定。

DOI:
10.1016/s0006-3495(98)77940-8
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发表时间:
1998
影响因子:
3.4
通讯作者:
Papke,RL
Papke,RL
中科院分区:
生物学3区
文献类型:
--
作者:
Francis,MM;Choi,KI;Horenstein,BA;Papke,RL

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一些非竞争性抑制剂(如神经节阻滞剂)对神经元烟碱乙酰胆碱受体(nachr)的抑制表现出选择性。本研究表征了二(2,2,6,6-四甲基-4-胡椒碱基)癸二酸酯(二- tmp -10或BTMPS)选择性长期抑制神经元和肌肉-神经元嵌合nAChRs的机制,二(2,2,6,6-四甲基胡椒碱基)癸二酸酯是强效神经节阻滞剂四甲基胡椒碱的双功能形式。bis- tmp -10对神经元nachr的长期抑制已经被证明,至少在一定程度上是由于bis化合物与神经元β-亚基的结合。在这项研究中,长期抑制被证明依赖于神经元β亚基的孔衬里第二跨膜结构域(tm2)内序列元件的存在;然而,抑制剂结合位点本身似乎并不包含在受膜电场影响的通道孔段内。具体来说,我们的研究结果表明,双tmp -10与一个激活敏感元件相互作用,其可用性可能受到tm2结构域序列的调节。此外,我们证明了长期抑制的化合物长度要求,这将与位于受体细胞外部分的多个位点的结合一致。
Some noncompetitive inhibitors (e.g., ganglionic blockers) exhibit selectivity for the inhibition of neuronal nicotinic acetylcholine receptors (nAChRs). This study characterizes the mechanism of selective long-term inhibition of neuronal and muscle-neuronal chimeric nAChRs by bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate (bis-TMP-10 or BTMPS), a bifunctional form of the potent ganglionic blocker tetramethylpiperidine. Long-term inhibition of neuronal nAChRs by bis-TMP-10 has been previously demonstrated to arise, at least in part, from the binding of the bis compound to neuronalβ-subunits. In this study, long-term inhibition is demonstrated to be dependent upon the presence of sequence element(s) within the pore-lining second transmembrane domain (tm2) of neuronalβ-subunits; however, the inhibitor binding site itself does not appear to be contained within the segment of the channel pore influenced by the membrane electric field. Specifically, our results imply that bis-TMP-10 interacts with an activation-sensitive element, the availability of which may be regulated by a sequence in the tm2 domain. Furthermore, we demonstrate a compound length requirement for long-term inhibition that would be consistent with binding to multiple sites located on the extracellular portion of the receptor.
不带电荷的烟碱非竞争性拮抗剂的光掺入揭示了激动剂诱导的乙酰胆碱受体 M2 区域结构的变化。
DOI: --
发表时间: 1992
期刊: The Journal of biological chemistry
影响因子: --
作者:
White,BH;Cohen,JB
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局部麻醉剂暂时阻断通过单个乙酰胆碱受体通道的电流。
DOI: --
发表时间: 1978
期刊: Journal of Physiology
影响因子: --
作者:
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影响因子: 11.1
作者:
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聚烷基哌啶:一系列新的神经节阻滞剂
DOI: 10.1038/1811397a0
发表时间: 1958
期刊: Nature
影响因子: 64.8
作者:
A. Spinks;E. Young
通讯作者: E. Young
DOI: 10.1073/pnas.84.21.7763
发表时间: 1987-11-01
影响因子: 11.1
作者:
BOULTER, J;CONNOLLY, J;PATRICK, J
通讯作者: PATRICK, J