Arcadin-1 is encoded by arcade gene cluster which also encodes cernactin. Crenactin is a filament-forming protein from the crenarchaeon Pyrobaculum calidifontis which shows exceptional similarity to eukaryotic F-actin. Arcadin-1 on the other hand does not seem to be related to any known eukaryotic actin binding proteins nor does it affect crenactin polymerisation [1].

1: Crenactin forms actin-like double helical filaments regulated by arcadin-2. Izore T, Kureisaite-Ciziene D, McLaughlin SH, Lowe J; Elife. 2016; [Epub ahead of print] PMID:27852434