Myosin: Definition, Function & Structure

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  • 0:00 Where Is Myosin Found?
  • 0:35 What Is Myosin?
  • 1:43 Structure of Myosin
  • 2:26 Lesson Summary
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Lesson Transcript
Instructor: Ryan Hultzman
There are many different fibers and filaments that help cells and organisms move, walk, talk, breathe, etc. One of these filaments is called myosin. Watch the video lesson to find out what myosin is, how it works and its structure.

Where Is Myosin Found?

In both eukaryotic cells, cells that have membrane-bound organelles and a nucleus, and prokaryotic cells, cells that lack a nucleus and membrane-bound organelles, we can find myosin. It exists as a filament inside of the cell. It is responsible for a number of interactions, such as movement and contractions of muscles. Again, myosin can be found in most every kind of cell; it is not specific to a certain kingdom, like plants or animals, or type of cell.

What Is Myosin?

Myosin is a motor molecule that works to move the cell. This will result in a contraction and expansion movement. It works closely with a globular protein called actin that polymerizes to create actin filaments. Myosin is a special protein that converts adenosine triphosphate (ATP), a molecule that cells use in order to live and work, into mechanical energy (energy for work). This will then generate force and movement.

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