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The Sec61p Complex Is a Dynamic Precursor Activated Channel

机译:Sec61p复合体是一个动态的前体激活通道

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Previous studies have shown that the rough endoplasmic reticulum (ER) contains nascent precursor polypeptide gated channels. Circumstantial evidence suggests that these channels are formed by the Sec61p complex. We reconstituted the purified Sec61p complex in a lipid bilayer and characterized its dynamics and regulation. The Sec61p complex is sufficient to form the precursor polypeptide activated channel under co- and posttranslational transport conditions. Activity of the Sec61p channel in both transport modes is induced by direct interaction with precursor protein. The Sec61p complex comprises a highly dynamic pore covering conductances corresponding to channel openings from ~6 to 60 A. Its properties are indistinguishable from those we observed with native ER channels, directly demonstrating that these channels are formed by the Sec61p complex.
机译:先前的研究表明,粗糙的内质网(ER)包含新生的前体多肽门控通道。间接证据表明,这些通道是由Sec61p复合物形成的。我们在脂质双层中重构了纯化的Sec61p复合物,并表征了其动力学和调控。 Sec61p复合物足以在共翻译和翻译后运输条件下形成前体多肽激活通道。 Sec61p通道在两种转运模式中的活性是通过与前体蛋白的直接相互作用诱导的。 Sec61p复合物包含一个高动态的孔覆盖电导,对应于〜6至60 A的通道开口。它的性质与我们用天然ER通道观察到的那些没有区别,直接表明这些通道是由Sec61p络合物形成的。

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