Department of Ecology, Evolution, and Natural Resources, Rutgers University, New Brunswick, NJ 08540, USA.
Trends Plant Sci. 2013 Dec;18(12):680-7. doi: 10.1016/j.tplants.2013.09.007. Epub 2013 Oct 16.
Plastids fulfill a variety of different functions (e.g., photosynthesis and amino acid biosynthesis) that rely on proteins of cyanobacterial (i.e., endosymbiont), noncyanobacterial, and 'host' (eukaryotic) origins. Analysis of plastid proteome data from glaucophytes and green algae allows robust inference of protein origins and organelle protein sharing across the >1 billion years of Archaeplastida evolution. Here, we show that more than one-third of genes encoding plastid proteins lack detectable homologs in Cyanobacteria, underlining the taxonomically broad contributions to plastid functions. Chlamydiae and Proteobacteria are the most significant other bacterial sources of plastid proteins. Mapping of plastid proteins to metabolic pathways shows a core set of anciently derived proteins in Archaeplastida, with many others being lineage specific and derived from independent horizontal gene transfer (HGT) events.
质体具有多种不同的功能（例如光合作用和氨基酸生物合成），这些功能依赖于蓝藻（即内共生体）、非蓝藻和“宿主”（真核生物）来源的蛋白质。对蓝藻和绿藻的质体蛋白质组数据进行分析，可以在超过 10 亿年的古菌质体进化过程中，对蛋白质的起源和细胞器蛋白质的共享进行稳健的推断。在这里，我们表明，编码质体蛋白质的基因中，有超过三分之一在蓝藻中没有可检测到的同源物，这突出了对质体功能的广泛的分类贡献。衣原体和变形菌是质体蛋白的最重要的其他细菌来源。将质体蛋白映射到代谢途径上，显示出古菌质体中有一组核心的古老衍生蛋白质，而许多其他蛋白质则是谱系特异性的，并来自独立的水平基因转移（HGT）事件。
