Extracellular vesicles of Euryarchaeida: precursor to eukaryotic membrane trafficking

Since their discovery, extracellular vesicles (EVs) have changed our view on how organisms interact with their extracellular world. EVs are able to traffic a diverse array of molecules across different species and even domains, facilitating numerous functions. In this study, we investigate EV production in Haloferax volcanii, as representative for Euryarchaeida. We uncover that EVs enclose RNA, with specific transcripts preferentially enriched, including those with regulatory potential, and conclude that EVs can act as an RNA communication system between haloarchaea. We demonstrate the key role of an EV-associated Ras superfamily GTPase for EV formation in H. volcanii that is also present across other diverse evolutionary branches of Archaea. Ras superfamily GTPases are key players in eukaryotic intracellular vesicle formation and trafficking mechanisms that have been crucial for the emergence of Eukaryotes. Therefore, we propose that archaeal EV formation could reveal insights into the origin of the compartmentalized eukaryotic cell.

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