TPM4

TPM4 is a member of the tropomyosin family of actin-binding proteins involved in the contractile system of striated and smooth muscles and the cytoskeleton of non-muscle cells. Tropomyosins are dimers of coiled-coil proteins that polymerize end-to-end along the major groove in most actin filaments. They provide stability to the filaments and regulate access of other actin-binding proteins. In muscle cells, they regulate muscle contraction by controlling the binding of myosin heads to the actin filament.

Tropomyosin 4

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 (By similarity).
Binds calcium (PubMed:1836432).

Biological Process actin filament organization Source:GO_Central1 Publication
Biological Process muscle contraction Source:GO_Central1 Publication
Biological Process osteoblast differentiation Source:UniProtKB1 Publication

Cytoplasm, cytoskeleton
Associates with F-actin stress fibers.