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
期刊:
影响因子:
7.3
通讯作者:
Balla T
Balla T
中科院分区:
生物学1区
文献类型:
--
作者:
Korzeniowski MK;Manjarrés IM;Varnai P;Balla T

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基质相互作用分子STIM 1通过Orai 1通道调节Ca 2+内流,以响应ER管腔Ca 2+浓度的降低。为了寻找将STIM 1的细胞质方面从非活性状态切换到活性状态的机制,我们确定了STIM 1卷曲螺旋区域内的酸性基序,其保持Ca 2+激活结构域(CAD/SOAR)不活性。STIM 1酸性基序显示出与Orai 1的C-末端卷曲螺旋段的显著同源性,Orai 1是与STIM 1相互作用的假定位点。酸性区域内的突变使STIM 1组成型激活,而CAD/SOAR的短碱性片段内的突变阻止Orai 1激活。我们提出,在STIM 1激活过程中,CAD/SOAR结构域从分子内钳释放,允许基本片段激活Orai 1通道。STIM 1的这种进化保守的激活机制类似于通过假底物结合的分子内沉默来调节蛋白激酶。
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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