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prisoha [69]
3 years ago
8

List five proteins of the myofilaments and describe their physical arrangement

Biology
1 answer:
alex41 [277]3 years ago
6 0

The five proteins of the myofilaments are the following:

<span>1.  </span>Myosin, shaped like a golf club, with two polypeptides intertwined to form a shaftlike tail and a double globular head, or cross-bridge, projecting from it at an angle.

<span>2. </span>Fibrous actin is like a bead necklace—a string of subunits called globular (G) actin. Each G actin has an active site that can bind to the head of a myosin molecule.

<span>3. </span>Tropomyosin. It blocks the active sites of six or seven G actins and prevents myosin cross-bridges from binding to them when a muscle fiber is relaxed.

<span>4. </span>Troponin a smaller calcium-binding protein bound to each tropomyosin molecule.

<span>5. </span>Titin (connectin), run through the core of a thick filament, emerge from the end of it, and connect it to a structure called the Z disc.





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