Activation of STIM1-Orai1 involves an intramolecular switching mechanism.
Activation of STIM1-Orai1 involves an intramolecular switching mechanism.
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DOI:
10.1126/scisignal.2001122
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发表时间:
2010-11-16
影响因子:
7.3
通讯作者:
Balla T
中科院分区:
文献类型:
--
作者:
Korzeniowski MK;Manjarrés IM;Varnai P;Balla T
The stromal interaction molecule, STIM1 regulates Ca2+ entry via Orai1 channels in response to decreased concentration of ER luminal Ca2+. In search of a mechanism that switches the cytoplasmic aspect of STIM1 from an inactive to an active state, we identified an acidic motif within the STIM1 coiled-coil region that keeps the Ca2+ activation domain (CAD/SOAR) inactive. The STIM1 acidic motif shows significant homology to the C-terminal coiled-coil segment of Orai1, the postulated site of interaction with STIM1. Mutations within the acidic region make STIM1 constitutively active while those within a short basic segment of CAD/SOAR prevent Orai1 activation. We propose that during STIM1 activation, the CAD/SOAR domain is released from an intramolecular clamp allowing the basic segment to activate Orai1 channels. This evolutionary conserved activation mechanism of STIM1 resembles the regulation of protein kinases by intramolecular silencing with pseudosubstrate binding.
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DOI:
10.1073/pnas.0904664106
发表时间:
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影响因子:
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作者:
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通讯作者:
Muallem, Shmuel