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TCIDNameDomainKingdom/PhylumProtein(s)
1.N.9.1.1









Fusexin1, Fsx1, of 631 aas and 4 TMSs, 1 at the N-terminus and 3 at the C-terminus. It exhibits fusogenic activity and mediates bilateral cell-cell fusion in mammalian cells. Its existence suggests that eukaryotic fusexins arose from prokaryotic fusexins (Moi et al. 2022).

Archaea
Fsx1 of an uncultured archaeon
1.N.9.1.2









Uncharacterized protein of 630 aas and 4 TMSs in a 1 (N-terminus) + 3 (C-terminus) TMS arrangement.

Bacteria
Chlorobiota
Fuxexin homolog of Chlorobi bacterium
1.N.9.1.3









HAP2/GCS1 fusexin family protein of 605 aas and 3 TMSs, 1 at the N-terminus and 2 at the C-terminus.

Archaea
Candidatus Marsarchaeota
Fusexin of Candidatus Marsarchaeota archaeon (mine drainage metagenome)