Proteolysis

Proteolysis is the directed degradation (digestion) of proteins by cellular enzymes called proteases or by intramolecular digestion.

Proteolysis is used by the cell for several purposes. They include

Removal of N-terminal methionine residues after translation.
Removal of the signal sequence of peptides after their transport through a membrane
Separation of viral proteins that were translated from a monocistronic mRNA
Digestion of proteins from foods as a source of amino acids
Conversion of predecessor-proteins (proenzymes , zymogens, prehormones ) into their final structures.

Examples of proteases are trypsin and chymotrypsin.

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Story ideas from the Journal of Biological Chemistry Oceans Past: A Guide to Oceans Future American Chemical Society's weekly PressPac -- Jan. 9, 2008

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