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:
影响因子:
--
通讯作者:
Long SB
中科院分区:
文献类型:
--
作者:
Hou X;Pedi L;Diver MM;Long SB
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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