The proteasome controls ESCRT-III–mediated cell division in an archaeon

Gabriel Tarrason Risa, Fredrik Hurtig, Sian Bray, Anne E Hafner, Lena Harker-Kirschneck, Peter Faull, Colin Davis, Dimitra Papatziamou, Delyan R Mutavchiev, Catherine Fan, Leticia Meneguello, Andre Arashiro Pulschen, Gautam Dey, Siân Culley, Mairi Kilkenny, Diorge P Souza, Luca Pellegrini, Robertus AM de Bruin, Ricardo Henriques, Ambrosius P Snijders, Anđela Šarić, Ann-Christin Lindås, Nicholas P Robinson, Buzz Baum (see publication in Journal )


Eukaryotes likely arose from a symbiotic partnership between an archaeal host and an alpha-proteobacterium, giving rise to the cell body and the mitochondria, respectively. Because of this, a number of proteins controlling key events in the eukaryotic cell division cycle have their origins in archaea. These include ESCRT-III proteins, which catalyze the final step of cytokinesis in many eukaryotes and in the archaeon Sulfolobus acidocaldarius. However, to date, no archaeon has been found that harbors homologs of cell cycle regulators, like cyclin-dependent kinases and cyclins, which order events in the cell cycle across all eukaryotes. Thus, it remains uncertain how key events in the archaeal cell cycle, including division, are regulated.