Transmembrane segments form tertiary hairpins in the folding vestibule of the ribosome.

Transmembrane segments form tertiary hairpins in the folding vestibule of the ribosome.
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跨膜片段在核糖体的折叠前庭中形成三级发夹。

DOI:
10.1016/j.jmb.2013.09.013
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发表时间:
2014-01-09
影响因子:
5.6
通讯作者:
Deutsch, Carol
Deutsch, Carol
中科院分区:
生物学2区
文献类型:
--
作者:
Tu, LiWei;Khanna, Pooja;Deutsch, Carol

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膜蛋白的折叠开始于核糖体中的肽被拉长。在此过程中,新生肽沿着沿着100 μ m的隧道从肽基转移酶中心导航到出口。出口的近端是一个“折叠前庭”,允许新生肽压缩和探索潜在的三级折叠伴侣的构象空间。后者发生在胞质亚结构域,但尚未显示跨膜片段。我们现在证明,使用可及性测定和改进的分子内交联测定,电压门控钾(Kv)通道的螺旋跨膜S3 b-S4发夹(“桨”),Kv电压传感器的关键区域,在前庭中形成。在Kv生物发生的早期阶段检测到S3-S4发夹相互作用。此外,这前庭发夹是一致的,在质膜上的KV通道的封闭状态的构象。
Folding of membrane proteins begins in the ribosome as the peptide is elongated. During this process, the nascent peptide navigates along 100 Å of tunnel from the peptidyltransferase center to the exit port. Proximal to the exit port is a ‘folding vestibule’ that permits the nascent peptide to compact and explore conformational space for potential tertiary folding partners. The latter occurs for cytosolic subdomains, but has not yet been shown for transmembrane segments. We now demonstrate, using an accessibility assay and an improved, intramolecular crosslinking assay, that the helical transmembrane S3b-S4 hairpin (‘paddle’) of a voltage-gated potassium (Kv) channel, a critical region of the Kv voltage sensor, forms in the vestibule. S3-S4 hairpin interactions are detected at an early stage of Kv biogenesis. Moreover, this vestibule hairpin is consistent with a closed-state conformation of the Kv channel in the plasma membrane.
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