Identification of an alpha subunit of dihydropyridine-sensitive brain calcium channels.

Identification of an alpha subunit of dihydropyridine-sensitive brain calcium channels.
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二氢吡啶敏感脑钙通道的α亚基的鉴定。

DOI:
10.1126/science.2436296
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发表时间:
1987
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Catterall,WA
Catterall,WA
中科院分区:
--
文献类型:
--
作者:
Takahashi,M;Catterall,WA

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不同组织中的电压敏感钙通道具有不同的功能特性。以二氢吡啶PN200-110标记的纯化兔骨骼肌钙通道免疫沉淀钙通道α亚基的多克隆抗体(PAC-2)。PAC-2与骨骼肌通道的免疫反应性大于与脑钙通道的免疫反应性,且经脑通道治疗后仅部分被吸收。PAC-2特异性识别兔脑突触质膜中的一个大肽,其表观分子大小为16.9万道尔顿。该蛋白在表观分子量、抗原性和二硫键还原后的电泳行为方面类似于骨骼肌钙通道的α亚基。因此,兔脑二氢吡啶敏感钙通道具有与骨骼肌钙通道同源但不完全相同的α亚基。这两种钙通道的不同功能特性可能是由结构相似成分的微小变化引起的。
Voltage-sensitive calcium channels in different tissues have diverse functional properties. Polyclonal antibodies (PAC-2) against the α subunits of purified rabbit skeletal muscle calcium channels immunoprecipitated calcium channels labeled with the dihydropyridine PN200-110 from both skeletal muscle and brain. The immunoreactivity of PAC-2 with the skeletal muscle channel was greater than that with the brain calcium channel and was absorbed only partially by prior treatment with the brain channel. PAC-2 specifically recognized a large peptide in synaptic plasma membranes of rabbit brain with an apparent molecular size of 169,000 daltons. This protein resembles an α subunit of the skeletal muscle calcium channel in apparent molecular weight, antigenic properties, and electrophoretic behavior after reduction of disulfide bonds. Thus, the dihydropyridine-sensitive calcium channel of rabbit brain has an α subunit that is homologous, but not identical, to those of the skeletal muscle calcium channel. The different functional properties of these two calcium channels may result from minor variations in structurally similar components.
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