Arabidopsis Lunapark proteins are involved in ER cisternae formation.

Arabidopsis Lunapark proteins are involved in ER cisternae formation.
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DOI:
10.1111/nph.15228
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发表时间:
2018-08
期刊:
The New phytologist
影响因子:
--
通讯作者:
Hawes C
Hawes C
中科院分区:
其他
文献类型:
--
作者:
Kriechbaumer V;Breeze E;Pain C;Tolmie F;Frigerio L;Hawes C

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植物内质网(ER)是维持细胞内环境稳定的关键。内质网由一个动态的和不断重塑的网络的小管和池。几种保守的膜蛋白与植物内质网的形成和维持有关,如RHD 3和reticulon蛋白。尽管最近在哺乳动物和酵母细胞中的工作,在植物中ER网络组织的详细分子机制仍然是未知的。最近,在酵母和哺乳动物细胞中发现了一种名为Lunapark(LNP)的新型ER网络形成蛋白。在这里,我们确定了两个拟南芥LNP同源物,并通过共聚焦显微镜和潜在的功能,在塑造ER网络的蛋白质-蛋白质相互作用测定和突变体分析,研究其亚细胞定位。我们发现,AtLNP 1在烟草叶表皮细胞中的过度表达主要标记ER网络中的脑池,而AtLNP 2标记整个ER。LNP蛋白的过表达导致ER脑池的丰度增加,并且lnp 1和lnp 1 lnp 2 amiRNA系显示脑池减少和更大的多边形区域。因此,我们假设AtLNP 1和AtLNP 2参与决定植物ER的网络形态,可能是通过调节ER池的形成。
The plant endoplasmic reticulum (ER) is crucial to the maintenance of cellular homeostasis. The ER consists of a dynamic and continuously remodelling network of tubules and cisternae. Several conserved membrane proteins have been implicated in formation and maintenance of the ER network in plants, such as RHD3 and the reticulon proteins. Despite the recent work in mammalian and yeast cells, the detailed molecular mechanisms of ER network organization in plants remain largely unknown. Recently, novel ER network‐shaping proteins called Lunapark (LNP) have been identified in yeast and mammalian cells. Here we identify two Arabidopsis LNP homologues and investigate their subcellular localization via confocal microscopy and potential function in shaping the ER network using protein–protein interaction assays and mutant analysis. We show that AtLNP1 overexpression in tobacco leaf epidermal cells mainly labels cisternae in the ER network, whereas AtLNP2 labels the whole ER. Overexpression of LNP proteins results in an increased abundance of ER cisternae and lnp1 and lnp1lnp2 amiRNA lines display a reduction in cisternae and larger polygonal areas. Thus, we hypothesize that AtLNP1 and AtLNP2 are involved in determining the network morphology of the plant ER, possibly by regulating the formation of ER cisternae.
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