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Myosin - Wikipedia, the free encyclopedia (266 words) |
 | Myosins are class of eight molecular motor proteins found in eukaryote tissues. |
| It is one of the key motor systems in cells; it is best known that myosin II plays a major role in both muscle contractions and cytokinesis. |
| Other members of the myosin family have other purposes as well; myosin I and V participate in the transport of membrane vesicles while myosins VI, VII, and XV have functions related to hearing and hair cell stereocilia structure. |
| Molecular motor myosin VI moves 'hand over hand,' researchers say (595 words) |
| By labeling a myosin VI on the head (green), or on the neck (red), and localizing the dye within a few nanometers, scientists determined that myosin walks "hand-over-hand," while causing a part of the protein to come undone. |
| Myosin VI is a reverse-direction molecular motor that moves materials to various locations within a living cell. |
| Surprisingly, myosin VI has a step size that is highly variable, but on average is nearly as large as that of myosin V, which has a lever arm that is three times longer. |
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