Transmembrane helix connectivity in Orai1 controls two gates for calcium-dependent transcription.
Transmembrane helix connectivity in Orai1 controls two gates for calcium-dependent transcription.
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DOI:
10.1126/scisignal.aao0358
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发表时间:
2017-11-28
影响因子:
7.3
通讯作者:
Schindl R
中科院分区:
文献类型:
--
作者:
Frischauf I;Litviňuková M;Schober R;Zayats V;Svobodová B;Bonhenry D;Lunz V;Cappello S;Tociu L;Reha D;Stallinger A;Hochreiter A;Pammer T;Butorac C;Muik M;Groschner K;Bogeski I;Ettrich RH;Romanin C;Schindl R
The channel Orai1 requires Ca2+ store depletion in the endoplasmic reticulum and an interaction with Ca2+ sensor STIM1 to mediate Ca2+ signaling. Alterations in Orai1-mediated Ca2+ influx have been linked to several pathological conditions including immunodeficiency, tubular myopathy, and cancer. In this study, we screened large-scale cancer genomics datasets for dysfunctional Orai1 mutants. Five of the identified Orai1 mutations resulted in constitutively active gating and transcriptional activation. Our analysis showed that certain Orai1 mutations were clustered in the transmembrane 2 helix surrounding the pore, which is a trigger site for Orai1 channel gating. Analysis of the constitutively-open Orai1 mutant channels revealed two fundamental gates that enabled Ca2+ influx: Arginine side-chains were displaced so they no longer blocked the pore, and a chain of water molecules formed in the hydrophobic pore region. Together, these results enabled us to identify a cluster of Orai1 mutations that trigger Ca2+ permeation associated with gene transcription and provide a gating mechanism for Orai1.
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影响因子:
64.8
作者:
通讯作者:
--
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:
Gao J;Aksoy BA;Dogrusoz U;Dresdner G;Gross B;Sumer SO;Sun Y;Jacobsen A;Sinha R;Larsson E;Cerami E;Sander C;Schultz N
通讯作者:
Schultz N
影响因子:
20.3
作者:
Braun, Attila;Varga-Szabo, David;Nieswandt, Bernhard
通讯作者:
Nieswandt, Bernhard
影响因子:
5.6
作者:
Li, Huiming;Zhang, Lan;Hogan, Patrick G.
通讯作者:
Hogan, Patrick G.