The yeast p24 complex is required for the formation of COPI retrograde transport vesicles from the Golgi apparatus.

The yeast p24 complex is required for the formation of COPI retrograde transport vesicles from the Golgi apparatus.
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DOI:
10.1083/jcb.200710025
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发表时间:
2008-02-25
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Muñiz M
Muñiz M
中科院分区:
其他
文献类型:
--
作者:
Aguilera-Romero A;Kaminska J;Spang A;Riezman H;Muñiz M

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p24 家族成员是组装成异聚复合物的跨膜蛋白,在 ER 和高尔基体之间连续循环。这些货物蛋白被认为在 COPI 出芽中发挥结构作用,因为它们主要存在于哺乳动物 COPI 囊泡中。然而,这个假定的函数到目前为止还没有得到最终证明。此外,删除所有八个酵母 p24 家族成员不会产生严重的运输表型,这表明 p24 复合物对于 COPI 功能并不是必需的。在本文中,我们提供了直接证据,证明酵母 p24 复合物通过促进 COPI 包被囊泡的形成,在从高尔基体到内质网的逆行转运中发挥着积极作用。因此,我们的结果表明,p24 蛋白对于囊泡形成非常重要,而不仅仅是被动的旅行者,支持了这样的模型:货物与 ARF 超家族的小 GTP 酶和外壳亚基一起充当囊泡形成的引物。
The p24 family members are transmembrane proteins assembled into heteromeric complexes that continuously cycle between the ER and the Golgi apparatus. These cargo proteins were assumed to play a structural role in COPI budding because of their major presence in mammalian COPI vesicles. However, this putative function has not been proved conclusively so far. Furthermore, deletion of all eight yeast p24 family members does not produce severe transport phenotypes, suggesting that the p24 complex is not essential for COPI function. In this paper we provide direct evidence that the yeast p24 complex plays an active role in retrograde transport from Golgi to ER by facilitating the formation of COPI-coated vesicles. Therefore, our results demonstrate that p24 proteins are important for vesicle formation instead of simply being a passive traveler, supporting the model in which cargo together with a small GTPase of the ARF superfamily and coat subunits act as primer for vesicle formation.
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