Binds to actin filaments in muscle and non-muscle cells . Plays a central role, in association with the troponin complex, in the calcium dependent regulation of vertebrate striated muscle contraction . Smooth muscle contraction is regulated by interaction with caldesmon. In non-muscle cells is implicated in stabilizing cytoskeleton actin filaments.
Subcellular locations: Cytoplasm, Cytoskeleton
Associates with F-actin stress fibers.
Detected in primary breast cancer tissues but undetectable in normal breast tissues in Sudanese patients. Isoform 1 is expressed in adult and fetal skeletal muscle and cardiac tissues, with higher expression levels in the cardiac tissues. Isoform 10 is expressed in adult and fetal cardiac tissues, but not in skeletal muscle.