Thiol dependent intramolecular locking of Orai1 channels.
Thiol dependent intramolecular locking of Orai1 channels.
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DOI:
10.1038/srep33347
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发表时间:
2016-09-14
影响因子:
4.6
通讯作者:
Niemeyer BA
中科院分区:
文献类型:
--
作者:
Alansary D;Schmidt B;Dörr K;Bogeski I;Rieger H;Kless A;Niemeyer BA
Store-operated Ca2+ entry mediated by STIM1-gated Orai1 channels is essential to activate immune cells and its inhibition or gain-of-function can lead to immune dysfunction and other pathologies. Reactive oxygen species interacting with cysteine residues can alter protein function. Pretreatment of the Ca2+ selective Orai1 with the oxidant H2O2 reduces ICRAC with C195, distant to the pore, being its major redox sensor. However, the mechanism of inhibition remained elusive. Here we combine experimental and theoretical approaches and show that oxidation of Orai1 leads to reduced subunit interaction, slows diffusion and that either oxidized C195 or its oxidomimetic mutation C195D located at the exit of transmembrane helix 3 virtually eliminates channel activation by intramolecular interaction with S239 of transmembrane helix 4, thereby locking the channel in a closed conformation. Our results demonstrate a novel mechanistic model for ROS-mediated inhibition of Orai1 and identify a candidate residue for pharmaceutical intervention.
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DOI:
10.1073/pnas.89.22.10915
发表时间:
1992-11-15
影响因子:
11.1
作者:
HENIKOFF, S;HENIKOFF, JG
通讯作者:
HENIKOFF, JG
DOI:
10.1126/science.1228757
发表时间:
2012-12-07
期刊:
Science (New York, N.Y.)
影响因子:
--
作者:
Hou X;Pedi L;Diver MM;Long SB
通讯作者:
Long SB
影响因子:
7.3
作者:
Fonfria, E;Marshall, ICB;McNulty, S
通讯作者:
McNulty, S
影响因子:
2.9
作者:
Labute, Paul
通讯作者:
Labute, Paul
影响因子:
3.4
作者:
Holzmann, Christian;Kilch, Tatiana;Peinelt, Christine
通讯作者:
Peinelt, Christine