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			== Motor protein ==
			<gallery>
			File:Kinesin_walking.gif\|Kinesin walking
			File:1003_Thick_and_Thin_Filaments.jpg\|Thick and Thin Filaments
			</gallery>

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'''Motor proteins''' are a class of [[molecular motors]] that can move along the surface of a suitable substrate. They are powered by the hydrolysis of [[adenosine triphosphate]] (ATP) and convert chemical energy into mechanical work.

== Types of Motor Proteins ==

There are three types of motor proteins:

# [[Myosin]], which moves along [[actin]] filaments
# [[Kinesin]], which moves along [[microtubule]]s
# [[Dynein]], which also moves along microtubules

Each of these proteins has a distinct function in the cell, and they are all essential for various types of cell movement.

== Function of Motor Proteins ==

Motor proteins are responsible for a wide range of cellular processes. They are involved in [[cell division]], [[intracellular transport]], and [[muscle contraction]]. They also play a role in the movement of [[organelles]] and [[vesicles]] within cells, the beating of [[cilia]] and [[flagella]], and the movement of [[chromosomes]] during [[mitosis]] and [[meiosis]].

== Structure of Motor Proteins ==

Motor proteins have a common basic structure. They consist of one or more heavy chains, which provide the force for movement, and several light chains, which regulate the activity of the heavy chains. The heavy chains have a globular head, which binds to the substrate and hydrolyzes ATP, and a tail, which interacts with the cargo that the motor protein is moving.

== Mechanism of Action ==

The movement of motor proteins is powered by the hydrolysis of ATP. The energy released by this reaction is used to change the shape of the motor protein, which allows it to move along the substrate. The exact mechanism of movement varies between different types of motor proteins, but it generally involves a cycle of binding to the substrate, hydrolyzing ATP, releasing the products of hydrolysis, and detaching from the substrate.

== Role in Disease ==

Defects in motor proteins can lead to a variety of diseases. For example, mutations in the genes for dynein can cause [[neurodegenerative diseases]] such as [[amyotrophic lateral sclerosis]] (ALS). Mutations in the genes for kinesin can cause [[neuropathies]], and mutations in the genes for myosin can cause [[myopathies]].

== See Also ==

* [[Molecular motor]]
* [[Cell biology]]
* [[Protein structure]]

[[Category:Proteins]]
[[Category:Cell biology]]
[[Category:Molecular biology]]

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Motor protein - Revision history

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