STIM proteins: dynamic calcium signal transducers.

STIM proteins: dynamic calcium signal transducers.
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DOI:
10.1038/nrm3414
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发表时间:
2012-09
期刊:
Nature reviews. Molecular cell biology
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基质相互作用分子(STIM)蛋白在细胞中作为细胞钙(Ca2+)信号的动态协调者起作用。它们跨越内质网(ER)膜,感知内质网腔内储存的Ca2+水平的微小变化。当ER Ca2+被释放以产生初级Ca2+信号时,STIM蛋白经历了复杂的激活反应,并迅速转运到ER和质膜之间形成的连接处。在那里,STIM蛋白系住并激活高度Ca2+选择性的Orai通道,以介导精细控制的Ca2+信号并平衡细胞Ca2+。在这些STIM诱导的连接微域内的显著组织以及STIM的新调节剂和替代靶蛋白的鉴定细节正在出现。
Stromal interaction molecule (STIM) proteins function in cells as dynamic coordinators of cellular calcium (Ca2+) signals. Spanning the endoplasmic reticulum (ER) membrane, they sense tiny changes in the levels of Ca2+ stored within the ER lumen. As ER Ca2+ is released to generate primary Ca2+ signals, STIM proteins undergo an intricate activation reaction and rapidly translocate into junctions formed between the ER and the plasma membrane. There, STIM proteins tether and activate the highly Ca2+-selective Orai channels to mediate finely controlled Ca2+ signals and to homeostatically balance cellular Ca2+. Details are emerging on the remarkable organization within these STIM-induced junctional microdomains and the identification of new regulators and alternative target proteins for STIM.
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