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			==Protease==
			<gallery>
			File:TEV_protease_summary.png\|TEV protease summary
			File:Protease_mechanism_summary.svg\|Protease mechanism summary
			</gallery>

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'''Protease''' (also known as a '''proteolytic enzyme''', '''peptidase''' or '''proteinase''') is a type of [[enzyme]] that performs [[proteolysis]], protein catabolism by hydrolysis of [[peptide bonds]]. Proteases have evolved multiple times, and different classes of protease can perform the same reaction by completely different catalytic mechanisms. Proteases can be found in all forms of life and viruses. They are involved in a multitude of physiological reactions from simple digestion of food proteins to highly regulated cascades (e.g., the [[blood-clotting cascade]], the [[complement system]], [[apoptosis]] pathways, and the [[invertebrate]] [[prophenoloxidase-activating cascade]]). Some viruses, such as [[HIV]], depend on proteases in their reproductive cycle. Consequently, proteases are the target of numerous medical and agricultural research programs and are used in various industrial applications.

== Classification ==

Proteases can be classified into seven broad groups:

# [[Serine proteases]]
# [[Threonine proteases]]
# [[Cysteine proteases]]
# [[Aspartic proteases]]
# [[Metalloproteases]]
# [[Glutamic proteases]]
# [[Asparagine peptide lyases]]

The threonine and glutamic-acid proteases were not described until 1995 and 2004 respectively.

== Function ==

Proteases are involved in digesting long protein chains into shorter fragments by splitting the peptide bonds that link [[amino acid]] residues. Some detach the terminal amino acids from the protein chain; others attack internal peptide bonds of a protein.

== Medical and commercial use ==

Proteases are used medically and in industry. Their commercial applications include their use in detergents, food, and in the leather industry. Some proteases are considered virulence factors in some microorganisms, contributing to pathogenesis. Proteases are also used in research to remove proteins from experimental samples.

== See also ==

* [[Enzyme]]
* [[Peptide bond]]
* [[Amino acid]]
* [[Serine proteases]]
* [[Threonine proteases]]
* [[Cysteine proteases]]
* [[Aspartic proteases]]
* [[Metalloproteases]]
* [[Glutamic proteases]]
* [[Asparagine peptide lyases]]

[[Category:Enzymes]]
[[Category:Proteases]]
[[Category:Protein catabolism]]

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Protease - Revision history

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