Does mRNA targeting explain gene retention in chloroplasts?

IF 17.3 1区 生物学 Q1 PLANT SCIENCES Trends in Plant Science Pub Date : 2024-10-22 DOI:10.1016/j.tplants.2024.09.017
Wolfgang R Hess, Annegret Wilde, Conrad W Mullineaux
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Abstract

During their evolution from cyanobacteria, plastids have relinquished most of their genes to the host cell nucleus, but have retained a core set of genes that are transcribed and translated within the organelle. Previous explanations have included incompatible codon or base composition, problems importing certain proteins across the double membrane, or the need for tight regulation in concert with the redox status of the electron transport chain. In this opinion article we propose the 'mRNA targeting hypothesis'. Studies in cyanobacteria suggest that mRNAs encoding core photosynthetic proteins have features that are crucial for membrane targeting and coordination of early steps in complex assembly. We propose that the requirement for intimate involvement of mRNA molecules at the thylakoid surface explains the retention of core photosynthetic genes in chloroplasts.

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mRNA 靶向能否解释叶绿体中基因的保留?
在从蓝藻进化的过程中,质体将其大部分基因交给了宿主细胞核,但保留了一组在细胞器内转录和翻译的核心基因。以往的解释包括:密码子或碱基组成不兼容、某些蛋白质跨双层膜导入存在问题,或需要与电子传递链的氧化还原状态配合进行严格调控。在这篇观点文章中,我们提出了 "mRNA 靶向假说"。对蓝藻的研究表明,编码核心光合蛋白的 mRNA 具有对膜靶向和协调复合体组装早期步骤至关重要的特征。我们认为,mRNA 分子需要在类囊体表面密切参与,这就是核心光合基因保留在叶绿体中的原因。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Trends in Plant Science
Trends in Plant Science 生物-植物科学
CiteScore
31.30
自引率
2.00%
发文量
196
审稿时长
6-12 weeks
期刊介绍: Trends in Plant Science is the primary monthly review journal in plant science, encompassing a wide range from molecular biology to ecology. It offers concise and accessible reviews and opinions on fundamental plant science topics, providing quick insights into current thinking and developments in plant biology. Geared towards researchers, students, and teachers, the articles are authoritative, authored by both established leaders in the field and emerging talents.
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