Homotypic fusion of endoplasmic reticulum membranes in plant cells.

Homotypic fusion of endoplasmic reticulum membranes in plant cells.
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植物细胞内质网膜的同型融合

DOI:
10.3389/fpls.2013.00514
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发表时间:
2013-12-18
影响因子:
5.6
通讯作者:
Hu J
Hu J
中科院分区:
生物学2区
文献类型:
--
作者:
Zhang M;Hu J

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内质网(ER)是一种膜结合的细胞器,其膜包括小管和片的网络。这些特征性形状的形成和通过同型膜融合维持其连续性似乎对ER的正常功能至关重要。atlastins(atlastins,ATLs)是一个位于内质网的动力蛋白样GTP酶家族,是后生动物内质网膜的融合蛋白。哺乳动物细胞中ATL蛋白的突变会导致ER的形态缺陷,而纯化的果蝇ATL在体外介导膜融合。植物细胞不具有ATL,但一个类似的GTP酶家族,命名为根毛缺陷3(RHD 3),可能是ATL的功能直系同源物。在这篇综述中,我们总结了最近的进展,我们了解RHD3蛋白如何发挥作用,在同型ER融合。我们还讨论了在植物细胞中形成管状ER网络的可能生理意义。
The endoplasmic reticulum (ER) is a membrane-bounded organelle whose membrane comprises a network of tubules and sheets. The formation of these characteristic shapes and maintenance of their continuity through homotypic membrane fusion appears to be critical for the proper functioning of the ER. The atlastins (ATLs), a family of ER-localized dynamin-like GTPases, have been identified as fusogens of the ER membranes in metazoans. Mutations of the ATL proteins in mammalian cells cause morphological defects in the ER, and purified Drosophila ATL mediates membrane fusion in vitro. Plant cells do not possess ATL, but a family of similar GTPases, named root hair defective 3 (RHD3), are likely the functional orthologs of ATLs. In this review, we summarize recent advances in our understanding of how RHD3 proteins play a role in homotypic ER fusion. We also discuss the possible physiological significance of forming a tubular ER network in plant cells.
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