Multiple C2 domains and Transmembrane region Proteins (MCTPs) tether membranes at plasmodesmata

Multiple C2 domains and Transmembrane region Proteins (MCTPs) tether membranes at plasmodesmata
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胞间连丝的多个 C2 结构域和跨膜区蛋白 (MCTP) 束缚膜

DOI:
10.1101/423905
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发表时间:
2018
期刊:
--
影响因子:
--
通讯作者:
Brault M
Brault M
中科院分区:
--
文献类型:
--
作者:
Brault M

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在真核生物中,膜接触部位(MCS)允许细胞器之间的直接通信。植物已经进化出一种独特的MCS,在细胞间的毛孔内,胞间连丝,内质网(ER)-质膜(PM)的接触与细胞间信号的调节相一致。胞间连丝内膜系留的分子机制和功能尚不清楚。在这里,我们展示了多个C2结构域和跨膜区蛋白(MCTP)家族,它们是植物细胞间信号转导的关键调节因子,专门在胞间连丝扮演ER-PM纽带的角色。我们报道MCTP是胞间连丝蛋白,通过它们的跨膜区插入内质网,而它们的C2结构域通过与阴离子磷脂的相互作用对接到PM。AAtmctp3/Atmctp4功能缺失导致植物发育缺陷,胞间连丝功能和组成受损,而酵母Δ系留突变体表达MCTP4可部分恢复ER-PM系留。我们的数据表明,MCTP是控制内质网-质膜接触和细胞间信号传递的独特的膜系留分子。
In eukaryotes, membrane contact sites (MCS) allow direct communication between organelles. Plants have evolved a unique type of MCS, inside intercellular pores, the plasmodesmata, where endoplasmic reticulum (ER)–plasma membrane (PM) contacts coincide with regulation of cell‐to‐cell signalling. The molecular mechanism and function of membrane tethering within plasmodesmata remain unknown. Here, we show that the multiple C2 domains and transmembrane region protein (MCTP) family, key regulators of cell‐to‐cell signalling in plants, act as ER‐PM tethers specifically at plasmodesmata. We report that MCTPs are plasmodesmata proteins that insert into the ER via their transmembrane region while their C2 domains dock to the PM through interaction with anionic phospholipids. AAtmctp3/Atmctp4loss of function mutant induces plant developmental defects, impaired plasmodesmata function and composition, while MCTP4 expression in a yeast Δtether mutant partially restores ER‐PM tethering. Our data suggest that MCTPs are unique membrane tethers controlling both ER‐PM contacts and cell‐to‐cell signalling.
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