Blocks the elongation and depolymerization of the actin filaments at the pointed end. The Tmod/TM complex contributes to the formation of the short actin protofilament, which in turn defines the geometry of the membrane skeleton (By similarity). Binds to the N-terminus of tropomyosin and to actin. In myofibrils with sarcomeric structure, localizes to the pointed end of actin thin filaments. Highly expressed in the erythrocyte, heart and skeletal muscle. Belongs to the tropomodulin family.