What is tropomyosin?

tropomyosin is a protein involved in the contraction of the skeletal muscle. In fact, it is a compound responsible for preventing the muscles of contracts when they are calm. This protein acts as a block during a chemical process that produces muscle contraction by orthinning around the chains of another protein found in muscle cells known as actin. The third protein called myosin must be able to bind to places along this actin protein to withdraw the muscles. It is this binding of both proteins that prevents tropomyosin. In muscle cells that form muscle fibers arranged in bundles, actin and myosin are arranged in alternating fibers. Myosin is a motor or motion protein that generates the strength after muscle contraction by sliding back and there along the actual rule inside the structure inside the muscle cell known Sarcomrere - one of the thousands - which can spread and download as a unit. During muscle contraction myosin proteins slide around an actin and release calcium ionsU that cause every myosin protein to bind to a neighboring place on an actin fiber. When this happens, myosin stretches around its neighboring actin, causing a collective shortening of a sarcomer that creates a contraction of muscle cells.

If the muscle is in a resting state and no muscle contraction is required, tropomyosine is watched around actin fibers, blocking binding areas and thus preventing myosin to prevent any muscle contraction. One tropomyosin molecule blocks seven binding sites on the actin molecule. This is done with the help of a protein complex called troponin, which is three proteins, each of which plays a different role in blocking or starting muscle contraction. One, Troponin T, is associated with tropomyosin to block myosin connection points. Another, Troponin I, joins the actin itself to hold the two on the spot through the binding areas.

the thirdThe type of troponin, Troponin C, helps the contraction process to start again by attaching to calcium ions. It stimulates the contraction of the release of these calcium ions from the channels inside the muscle cell. When they are released, they bind to Troponin C, which moves tropomyosin-troponin t from the way so that myosin has access to the binding points of the actin again, and sarcomer contractions can begin again.