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A phospholipase is an enzyme that hydrolyzes phospholipids1 into fatty acids and other lipophilic substances. There are four major classes, termed A, B, C and D distinguished by what type of reaction they catalyze:
- Phospholipase A
- Phospholipase A1 - cleaves the SN-1 acyl chain
- Phospholipase A2 - cleaves the SN-2 acyl chain
- Phospholipase B - cleaves both SN-1 and SN-2 acyl chains, also known as a lysophospholipase.
- Phospholipase C - cleaves before the phosphate, releasing diacylglycerol and a phosphate-containing head group. Phospholipase Cs play a central role in signal transduction, releasing the second messenger Inositol triphosphate.
- Phospholipase D - cleaves after the phosphate, releasing phosphatidic acid and an alcohol.
Types C and D are considered phosphodiesterases.
Phospolipase A2 acts on intact lecithin molecule and hydrolyses the fatty acid esterified to the second carbon atom.the product formed is lysolecithin and fatty acid. lysolecithin is an enzyme present in the venom of the viper snakes.2
See also
References
- ^ phospholipase at Dorland's Medical Dictionary
- ^ textbook of biochemistry by DM Vasudevan and S Sreekumari 5th edition.
External links
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- This page was last modified on 7 November 2008, at 21:01.
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