GUN1 and Plastid RNA Metabolism: Learning from Genetics.

GUN1 and Plastid RNA Metabolism: Learning from Genetics.
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DOI:
10.3390/cells9102307
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发表时间:
2020-10-16
期刊:
影响因子:
6
通讯作者:
Pesaresi P
Pesaresi P
中科院分区:
生物学2区
文献类型:
--
作者:
Tadini L;Jeran N;Pesaresi P

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GUN1是一种叶绿体定位的五肽重复(PPR)蛋白,在叶绿体与细胞核的逆行通讯中起着核心作用。这种信息流是叶绿体和核基因协调表达所必需的,对叶绿体的正确发育和功能也是必不可少的。大量的遗传学和生化研究表明,GUN1对叶绿体中的蛋白质动态平衡具有重要作用,然而,对于GUN1在叶绿体中的作用,目前还缺乏一个清晰而统一的观点。最近,GUN1被报道在激活逆行通讯时调节核编码的叶绿体RNA聚合酶(NEP)的活性和调控叶绿体RNA的编辑,揭示了GUN1在叶绿体RNA代谢中的重要作用。在这篇评论文章中,我们通过提供GUN1活性的新的和扩展的概念,讨论了最近发现的叶绿体RNA代谢和逆行信号之间的联系,该概念整合了过去十年报道的多种功能性遗传相互作用及其在叶绿体转录和转录本编辑中的主要作用。
GUN1 (genomes uncoupled 1), a chloroplast-localized pentatricopeptide repeat (PPR) protein with a C-terminal small mutS-related (SMR) domain, plays a central role in the retrograde communication of chloroplasts with the nucleus. This flow of information is required for the coordinated expression of plastid and nuclear genes, and it is essential for the correct development and functioning of chloroplasts. Multiple genetic and biochemical findings indicate that GUN1 is important for protein homeostasis in the chloroplast; however, a clear and unified view of GUN1′s role in the chloroplast is still missing. Recently, GUN1 has been reported to modulate the activity of the nucleus-encoded plastid RNA polymerase (NEP) and modulate editing of plastid RNAs upon activation of retrograde communication, revealing a major role of GUN1 in plastid RNA metabolism. In this opinion article, we discuss the recently identified links between plastid RNA metabolism and retrograde signaling by providing a new and extended concept of GUN1 activity, which integrates the multitude of functional genetic interactions reported over the last decade with its primary role in plastid transcription and transcript editing.
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