In details

Microtubules



Microtubule: Various Cellular Functions

What they are (definition)

Microtubules are structures (filaments) present in the cells of eukaryotes. They are formed by the polymerization process of two globular proteins (alpha and beta tubulin) and a dimer. They are important because they are involved in various processes performed by cells.

Microtubule Functions

- They form the cytoskeleton together with the intermediate filaments and actin microfilaments;

- They are part of the internal structure of the eyelashes and flagella;

- They act in the movement of cellular organelles;

- Participate in the process of intracellular transport of substances, forming platform species;

- Participate in the process of maintaining the cellular structure;

- Act on chromosome displacement in the process of cell division (mitosis)

Main features:

- They are about 25 nm (nanometer) in diameter.

- The inner diameter is about 12 nm.

- They have a cylindrical shape.

- They are rigid structures.

Microtubule Types

- Polar Microtubules

- Radial Microtubule

- Kinetochore microtubules

Did you know?

- Microtubules are not present in the cells of prokaryotes, such as bacteria.

Many proteins bind to microtubules, such as motor proteins.