The peroxisome biogenesis factors posttranslationally target reticulon homology domain-containing proteins to the endoplasmic reticulum membrane.

The peroxisome biogenesis factors posttranslationally target reticulon homology domain-containing proteins to the endoplasmic reticulum membrane.
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DOI:
10.1038/s41598-018-20797-0
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发表时间:
2018-02-02
期刊:
影响因子:
4.6
通讯作者:
Sakisaka T
Sakisaka T
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yamamoto Y;Sakisaka T

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内质网(endoplasmic reticulum,ER)是由一类含有内质网同源结构域(reticulon homology domain,RHD)的膜蛋白所形成,RHD是一个保守的疏水结构域,包含两个短发夹跨膜结构域。RHD存在于ER膜的外小叶中,产生高曲率ER膜。虽然大多数注定进入分泌途径的膜蛋白被靶向并插入ER膜,但含RHD的蛋白如何靶向并插入ER膜的分子机制仍有待澄清。在这里,我们表明,含有RHD的蛋白质可以posterally-targeted到ER膜。PEX 19是一种胞质过氧化物酶,它选择性地识别新生的含RHD的蛋白质,并与膜过氧化物酶PEX 3合作介导其翻译后靶向。因此,这些过氧化物酶体生物合成因子为含RHD蛋白的膜插入提供了另一种翻译后途径,这意味着ER膜成形和过氧化物酶体生物合成可能通过翻译后膜插入来协调。
The endoplasmic reticulum (ER) is shaped by a class of membrane proteins containing reticulon homology domain (RHD), the conserved hydrophobic domain encompassing two short hairpin transmembrane domains. RHD resides in the outer leaflet of the ER membrane, generating high-curvature ER membrane. While most of the membrane proteins destined to enter the secretory pathway are cotranslationally targeted and inserted into ER membrane, the molecular mechanism how the RHD-containing proteins are targeted and inserted into the ER membrane remains to be clarified. Here we show that RHD-containing proteins can be posttranslationally targeted to the ER membrane. PEX19, a cytosolic peroxin, selectively recognizes the nascent RHD-containing proteins and mediates their posttranslational targeting in cooperation with PEX3, a membrane peroxin. Thus, these peroxisome biogenesis factors provide an alternative posttranslational route for membrane insertion of the RHD-containing proteins, implying that ER membrane shaping and peroxisome biogenesis may be coordinated by the posttranslational membrane insertion.
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