Cytoskeleton

“Cytoskeleton is the structure that maintains the shape and internal organization of the cell, and provides it mechanical support. “

What is Cytoskeleton?

The cytoskeleton is the network of fibres forming the eukaryotic cells, prokaryotic cells and archaeans. These fibres in the eukaryotic cells contain a complex mesh of protein filaments and motor proteins that help in cell movement.

It provides shape and support to the cell, organizes the organelles and facilitates transport of molecules, cell division and cell signalling.

Let us have a detailed look at the structure and function of cytoskeleton.

Also Read: What is Cytoplasm

Cytoskeleton Structure

A cytoskeleton structure comprises the following types of fibres:

• Microfilaments
• Microtubules
• Intermediate Filaments

Microtubules

Microtubules appear like small, hollow, round tubes with a diameter of about 24 nanometers. They are made up of a protein, tubulin. Thirteen tubulins link to form a single tube. Microtubules are very dynamic structures, which reveal that they can change quickly. They keep growing or shrinking steadily. These help in transporting cellular materials and dividing chromosomes during cell division.

Microfilaments

Microfilaments are thread-like protein fibres, 3-6 nm in diameter. They are particularly found in muscle cells. They consist of the protein actin, responsible for muscle contraction. These are also responsible for cellular movements including cytokinesis, contraction, and gliding.

Intermediate Filaments

The intermediate filaments are about 10 nm in diameter and provide tensile strength to the cell. They facilitate the formation of keratins and neurofilaments.

The cytoskeleton is also made up of certain motor proteins. These include:

Kinesin

These proteins move along the microtubules carrying the cellular components. They pull the organelles along the cell membrane.

Dyneins

These pull the cell organelles towards the nucleus.

Myosin

These interact with actin protein and are responsible for muscle contractions. They also perform cytokinesis, exocytosis, and endocytosis.

Cytoskeleton Functions

 The important cytoskeleton functions are mentioned below:

1. It provides shape and support to the cell.
2. It helps in the formation of vacuoles.
3. It holds different cell organelles in place.
4. It assists in cell signalling.
5. It supports intracellular movements like the migration of cell organelles, transportation of vesicles in and out of the cell, etc.

Also Read: Cell Signalling

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