Crystal structure of the calcium release-activated calcium channel Orai.

Crystal structure of the calcium release-activated calcium channel Orai.
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DOI:
10.1126/science.1228757
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发表时间:
2012-12-07
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Long SB
Long SB
中科院分区:
其他
文献类型:
--
作者:
Hou X;Pedi L;Diver MM;Long SB

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质膜蛋白Orai形成CRAC通道(钙释放激活的钙通道)的孔道,并在内质网钙耗尽时产生持续的胞内钙信号。在3.35埃分辨率下测定的果蝇Orai的晶体结构表明,钙通道是由围绕中心离子孔排列的Orai亚基的六角体组装而成的。这个孔穿过细胞膜,延伸20埃进入细胞质。细胞外侧的一环谷氨酸形成了选择性过滤器。靠近细胞内侧的碱性区域可以结合可以稳定闭合状态的阴离子。该通道的结构明显不同于其他离子通道,并使我们深入了解选择性钙渗透和门控的原理。
The plasma membrane protein Orai forms the pore of the CRAC channel (calcium release-activated calcium channel) and generates sustained cytosolic calcium signals when triggered by depletion of calcium from the endoplasmic reticulum. The crystal structure of Orai from Drosophila melanogaster, determined at 3.35 angstrom resolution, reveals that the calcium channel is comprised of a hexameric assembly of Orai subunits arranged around a central ion pore. The pore traverses the membrane and extends 20 angstroms into the cytosol. A ring of glutamates on its extracellular side forms the selectivity filter. A basic region near the intracellular side can bind anions that may stabilize the closed state. The architecture of the channel differs markedly from other ion channels and gives insight into the principles of selective calcium permeation and gating.
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