SELMA易位机制的分子系统发育叙述了复杂光合作用真核生物的进化。

IF 5.3 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY
Rafael I Ponce-Toledo, David Moreira, Purificación López-García, Philippe Deschamps
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引用次数: 0

摘要

光合真核生物及其近亲是一个复杂的进化史的结果,包括通过内共生获得一系列质体,多次向异养逆转,有时质体完全丧失。在这些事件中,最具争议的是CASH谱系(隐藻门、肺泡门、层叠门和附藻门)的出现和多样化。尽管它们都包含了由红藻内共生产生的复杂质体的物种,但它们的系统发育关系仍然存在争议,质体获得的时间和数量仍然不确定。所有质体的内部代谢主要由核编码蛋白支持,因此,在每次内共生事件中,允许这些蛋白重新定位的机制已经进化或被循环利用。因此,对这些易位机制的组成和起源的研究为理解光合作用谱系如何出现和可能相关提供了重要线索。在CASH物种中,SELMA复合体由大约20种蛋白质组成,专门负责前蛋白通过外质体膜的运输,外质体膜是复杂红色质体的第二最外层膜。在这项工作中,我们提出了一个全面的基因组调查和组成SELMA复合物的蛋白质的系统发育分析。我们证实了SELMA在四个CASH谱系中的存在、同源性和单系起源,并利用这些观察结果推断出不同于先前假设的次生红色质体系列传播的情景,并为光合真核生物的进化提供了新的线索。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Molecular phylogeny of the SELMA translocation machinery recounts the evolution of complex photosynthetic eukaryotes.

Photosynthetic eukaryotes and their relatives are the result of an intricate evolutionary history involving a series of plastid acquisitions through endosymbiosis, multiple reversions to heterotrophy, and sometimes total plastid losses. Among these events, one of the most debated is the emergence and diversification of the CASH lineages (Cryptophyta, Alveolata, Stramenopiles and Haptophyta). Although they all include species bearing a complex plastid that derived from the endosymbiosis of a red alga, their phylogenetic relationships remain controversial, and the timing and number of plastid acquisitions are still undetermined. The inner metabolism of all plastids is mostly supported by nuclear-encoded proteins, and consequently, mechanisms allowing the relocation of those proteins have evolved or were recycled at each endosymbiotic event. Thus, the study of the composition and origins of those translocation machineries provides important clues for understanding how photosynthetic lineages have emerged and might be related. In CASH species, the SELMA complex, composed of about 20 proteins, is dedicated to the transport of pre-proteins across the periplastidial membrane, the second outermost membrane of complex red plastids. In this work, we present a comprehensive genomic survey and phylogenetic analysis of the proteins composing the SELMA complex. We confirm the presence, homology and monophyletic origin of SELMA in the four CASH lineages and use these observations to infer a scenario for the serial transmission of secondary red plastids that differs from previous hypotheses and sheds new light on the evolution of photosynthetic eukaryotes.

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来源期刊
Molecular biology and evolution
Molecular biology and evolution 生物-进化生物学
CiteScore
19.70
自引率
3.70%
发文量
257
审稿时长
1 months
期刊介绍: Molecular Biology and Evolution Journal Overview: Publishes research at the interface of molecular (including genomics) and evolutionary biology Considers manuscripts containing patterns, processes, and predictions at all levels of organization: population, taxonomic, functional, and phenotypic Interested in fundamental discoveries, new and improved methods, resources, technologies, and theories advancing evolutionary research Publishes balanced reviews of recent developments in genome evolution and forward-looking perspectives suggesting future directions in molecular evolution applications.
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