Éditeur(s) :
HAL CCSD eLife Sciences Publication Résumé : International audience
Plastids are supported by a wide range of proteins encoded within the nucleus and imported from the cytoplasm. These plastid-targeted proteins may originate from the endosymbiont, the host, or other sources entirely. Here, we identify and characterise 770 plastid-targeted proteins that are conserved across the ochrophytes, a major group of algae including diatoms, pelagophytes and kelps, that possess plastids derived from red algae. We show that the ancestral ochrophyte plastid proteome was an evolutionary chimera, with 25% of its phylogenetically tractable proteins deriving from green algae. We additionally show that functional mixing of host and plastid proteomes, such as through dual targeting, is an ancestral feature of plastid evolution. Finally, we detect a clear phylogenetic signal from one ochrophyte subgroup, the lineage containing pelagophytes and dictyochophytes, in plastid-targeted proteins from another major algal lineage, the haptophytes. This may represent a possible serial endosymbiosis event deep in eukaryotic evolutionary history.
ISSN: 2050-084X
Droits : http://creativecommons.org/licenses/by/
hal-01526828
http://hal.upmc.fr/hal-01526828 http://hal.upmc.fr/hal-01526828/document http://hal.upmc.fr/hal-01526828/file/e23717-download.pdf DOI : 10.7554/eLife.23717
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