is tropomyosin a filamentous protein
22. nation of these. Tropomyosin is known to be an a-helical protein both in skeletal muscle (5) and in nonmuscle cells (6, 7), and the extended configuraÂ­tion of this molecule may function to induce actin filaments to assemble in straight filamentous bunÂ­dles.ne type of interaction is characterized by the formation of foci that contain actin and a-actinin, and the other by the formation of filament bundles that connect these foci that contain tropomyosin and actin.