May be involved in anchoring the terminal actin filaments in the myofibril to the membrane and in transmitting tension from the myofibrils to the extracellular matrix. Interacts with actin, alpha-actinin, KLHL41, TLN1 and VCL. Interacts with CSRP3. Localized at the myotendinous junction in skeletal muscle and at the intercalated disk in cardiac muscle. Expressed in cardiac and skeletal muscle. Not detected in kidney, spleen, liver, brain, lung, stomach or uterus. Expression significantly increased from 10.5 dpc to 16.5 dpc, and subsequently remained constant until 21 days after birth. In 9.5 dpc to 10.5 dpc embryonic heart, expression is primarily associated with developing premyofibril structures containing alpha-actinin.