[Answer] What is tropomyosin?

Answer: It is a long fibrous protein that winds around the actin polymer blocking all the myosin-binding sites.
What is tropomyosin?

Tropomyosin – Wikipedia

Tropomyosin receptor kinase A – Wikipedia

Tropomyosin – Wikipedia

Tropomyosin is a two-stranded alpha-helical coiled coil protein found in actin-based cytoskeletons.

Tropomyosin alpha-3 chain is a protein that in humans is encoded by the TPM3 gene. This gene encodes 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…

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