ER exit sites in Drosophila display abundant ER-Golgi vesicles and pearled tubes but no megacarriers

ER exit sites in Drosophila display abundant ER-Golgi vesicles and pearled tubes but no megacarriers
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果蝇的 ER 出口位点显示丰富的 ER-高尔基体囊泡和珍珠管,但没有巨载体

DOI:
10.1101/2021.03.09.434528
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发表时间:
2021-03
期刊:
影响因子:
8.8
通讯作者:
Jose C. Pastor-Pareja
Jose C. Pastor-Pareja
中科院分区:
生物学1区
文献类型:
--
作者:
Ke Yang;Min Liu;Zhi Feng;Marta Rojas;Lingjian Zhou;Hongmei Ke;Jose C. Pastor-Pareja

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在运送到高尔基体之前,在内质网出口点(ERES)收集分泌物。几十年的研究已经提供了er -高尔基交换的分子事件的许多细节。然而,关于细胞内er -高尔基界面的组织和介导ERES传输的膜结构类型的基本问题仍然存在。为了研究这些,我们在果蝇中使用转基因标记、3D-SIM和FIB-SEM来表征胶原生成脂肪体、像盘和过表达ERES决定因素Tango1的像盘中的ERES-高尔基单位。我们发现ERES前的前顺-高尔基区参与了逆行和顺行运输。这个前顺位高尔基体与其余的高尔基体是连续的,而不是一个单独的中间隔间或大型载体的集合,我们没有发现证据。然而,我们发现了许多囊泡,以及连接ERES和高尔基体的珠状小管。
Secretory cargos are collected at ER exit sites (ERES) before transport to the Golgi apparatus. Decades of research have provided many details of the molecular events underlying ER-Golgi exchanges. Essential questions, however, remain about the organization of the ER-Golgi interface in cells and the type of membrane structures mediating traffic from ERES. To investigate these, we used transgenic tagging in Drosophila flies, 3D-SIM and FIB-SEM to characterize ERES-Golgi units in collagen-producing fat body, imaginal discs and imaginal discs overexpressing ERES determinant Tango1. We found in front of ERES a pre-cis-Golgi region involved in both anterograde and retrograde transport. This pre-cis-Golgi is continuous with the rest of the Golgi, not a separate intermediate compartment or collection of large carriers, for which we found no evidence. We found, however, many vesicles, as well as pearled tubules connecting ERES and Golgi.
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