ANFS140 Lecture Notes - Lecture 19: Globular Protein, Alpha Helix, Troponin
3 Apr 2017
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Helpful link: http://classes. midlandstech. edu/carterp/courses/bio110/chap07/chap07. html actin filaments are joined end to end at the end of a sarcomere: where the alpha-actinin lies is called the z line. Z lines demarcate the sarcomere: z come closer together when there is contraction, all contract down the myofibril. Sarcomere are liked together in a serial fashion all the way down the length of a myofibril. Contraction: if calcium is added to a relaxed muscle, it depolarizes the muscle cells, causing it to contract, bands that don"t change length during contraction: Z line: bands that change length during contraction: Structure of actin filaments: all cells have actin for cytoskeleton but all makes up muscle, also referred to as f-actin (filament actin, actin is made of globular proteins that are strung together. Tropomysosin--a long protein strand composed of two fully alpha helical chains in a coiled-coil dimmer, and binds along the length of the actin filament.
