Coevolution of Eukaryote-like Vps4 and ESCRT-III Subunits in the Asgard Archaea
Zhongyi Lu, Ting Fu, Tianyi Li, Yang Liu, Siyu Zhang, Jinquan Li, Junbiao Dai, Eugene V. Koonin, Guohui Li, Huiying Chu, Meng Li
Abstract
The discovery of Asgard archaea has changed the existing ideas on the origins of eukaryotes. Researchers propose that eukaryotic cells evolved from Asgard archaea. This hypothesis partly stems from the presence of multiple eukaryotic signature proteins in Asgard archaea, including homologs of ESCRT proteins that are essential components of the endomembrane system in eukaryotes. However, structural and functional features of Asgard ESCRT remain unknown. Our study provides evidence that Asgard ESCRT is functionally comparable to the eukaryotic counterparts, suggesting that despite the apparent absence of endomembranes in archaea, eukaryotic ESCRT was inherited from an Asgard archaeal ancestor, alongside the emergence of endomembrane system during eukaryogenesis.