Myocardin is a smooth and cardiac muscle-specific transcriptional coactivator of serum response factor.
When expressed ectopically in nonmuscle cells, myocardin can induce smooth muscle differentiation by its association with serum response factor (SRF) (MIM.600589).
References
Wang DZ, Olson EN. Control of smooth muscle development by the myocardin family of transcriptional coactivators. Curr Opin Genet Dev. 2004 Oct;14(5):558-66. PMID: 15380248