Required for proper contractility of visceral smooth muscle cells (PubMed:28292896). Mediates nucleation of actin filaments (By similarity). Colocalizes with actin filaments in sarcomeres. Detected in aorta, urinary bladder and uterus (at protein level). Detected in smooth muscle cells. Detected in aorta, bladder, colon, intestine, stomach and uterus. Belongs to the tropomodulin family.