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Cytoskeleton

Cytoskeleton
Cytosol contains cytoskeletal fabrics formed of microtubules, microfilaments and intermediate filaments, all constituting cytoskeleton.

Composition

Cytoskeleton is made by different proteins. The main proteins that are present in cytoskeleton are tubulin, actin, myosin, tropomyosin and others, which are also found in muscles.

Types of Cytoskeletal Fibers

(i) Microtubules
  • These are long, unbranched and slender tubulin proteinstructures.
  • Their important role is in assembly and disassembly of the spindle structure during mitosis. They are also involved in formation of cilia, flagella andbasal bodies.
(ii) Microfilaments
  • These are more slender cylinders made up of contractile actin protein, linked to inner face of the plasma membrane.
  • They are involved in internal cell motion e.g. movement of cyclosis and amoeboid movement.
(iii) Intermediate Filaments

  • They have diameter in between those of microtubules and microfilaments.
  • They play role in maintenance of cell shape and integration of cellular compartment.

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