Besides actin and myosin, what is another example of a Contractile Protein?

If you could tell me about its function too, that would help too.

Thanks

Another example of a contractile protein besides actin and myosin is tubulin. Tubulin is a key component of microtubules, which are long, hollow structures found in the cytoplasm of cells. Microtubules play crucial roles in cell division, intracellular transport, and the maintenance of cell structure.

The primary function of tubulin is to provide structural support and stability to the cells. It aids in organizing and maintaining the shape of the cell, both internally and externally. Tubulin also contributes to the movement of cellular components, such as vesicles and organelles, through a process called intracellular transport.

In addition to its structural role, tubulin is involved in the formation of mitotic spindles during cell division. Mitotic spindles are responsible for segregating the duplicated chromosomes into two daughter cells. Tubulin proteins assemble and disassemble to form the dynamic microtubule structures required for this process.

Overall, tubulin and the microtubules it forms are critical for numerous cellular activities, including cell division, maintaining cell shape, and intracellular transport.