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Orai1是CRAC通道的一个基本孔子子单元
Murali Prakriya1, Stefan Feske, Yousang Gwack
1Department of Molecular Pharmacology and Biological Chemistry, Northwestern University, Feinberg School of Medicine, Chicago, Illinois 60611, USA.
储存运行的释激活 (CRAC) 通道对于免疫细胞激活至关重要. 这项研究表明,Orai1是CRAC通道的孔子子单位,对流入至关重要.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
背景情况:
- 免疫细胞刺激消耗了内质网膜 (ER) 的Ca2+储量,激活了储存的Ca2+释放激活的Ca2+ (CRAC) 通道.
- STIM蛋白感知ER Ca2+水平,并在储存量耗尽时启动CRAC电流激活.
- 奥莱和奥莱1被确定为Ca2+进入STIM的关键下游组件.
研究的目的:
- 确定Orai1在STIM介导的CRAC通道激活中的精确作用.
- 调查Orai1是否作为细胞内链接,辅助蛋白或CRAC通道的孔子子单元.
主要方法:
- 在Orai1跨膜段 (E106D,E190Q) 中保存的酸性残留的突变.
- 在表达野生型和突变Orai1.1的细胞中对CRAC通道功能的电生理学分析.
- 对Ca2+流入和离子选择性的评估 (单价酸,Cs+).
主要成果:
- Orai1定位在等离子体膜上.
- 在Orai1跨膜螺旋体中的E106D和E190Q突变显著改变了CRAC通道功能.
- 这些突变减少了Ca2+的流入,增加了单价离子电流,并赋予了Cs+的透性,表明了离子选择性的变化.
结论:
- Orai1是CRAC通道的一个孔子子单位.
- 在Orai1跨膜段内的特定酸性残留物对其功能和离子选择性至关重要.
- 这些发现为Orai1在形成CRAC通道孔中的直接作用提供了有力的证据.
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