Myozenins may serve as intracellular binding proteins involved in linking Z line proteins such as alpha-actinin, gamma-filamin, TCAP/telethonin, LDB3/ZASP and localizing calcineurin signaling to the sarcomere. Plays an important role in the modulation of calcineurin signaling. May play a role in myofibrillogenesis (By similarity). Interacts via its C-terminus with spectrin repeats 3 and 4 of ACTN2. Interacts with ACTN1, LDB3, MYOT and PPP3CA (By similarity). Colocalizes with ACTN1 and PPP3CA at the Z-line of heart and skeletal muscle. Belongs to the myozenin family.