Plays a role in the dynamic structure of centrosome-associated contractile fibers via its interaction with CETN2. Interacts with CETN2 (via C-terminus). Localized close to the centriole. CETN2-binding regions contains a conserved Trp residue in their C-terminal ends, which seems critical for interaction with CETN2. Belongs to the SFI1 family. It is uncertain whether Met-1 or Met-24 is the initiator.