Lipoxygenase | Wikipedia audio article
Channel: wikipedia tts
Date: 10/12/2018

This is an audio version of the Wikipedia Article:
Lipoxygenase


00:01:18 1 Biochemistry
00:04:33 2 Biological function and classification
00:05:09 2.1 Plant lipoxygenases
00:05:45 2.2 Human lipoxygenases
00:14:31 2.3 Mouse lipoxygenases
00:18:47 3 3D structure
00:19:58 4 Active site
00:22:17 5 Biochemical classification



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SUMMARY
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Lipoxygenases (EC 1.13.11.-) are a family of (non-heme), iron-containing enzymes most of which catalyze the dioxygenation of polyunsaturated fatty acids in lipids containing a cis,cis-1,4- pentadiene into cell signaling agents that serve diverse roles as autocrine signals that regulate the function of their parent cells, paracrine signals that regulate the function of nearby cells, and endocrine signals that regulate the function of distant cells.
The lipoxygenases are related to each other based upon their similar genetic structure and dioxygenation activity.  However, one lipoxygenase, ALOXE3, while having a lipoxygenase genetic structure, possesses relatively little dioxygenation activity; rather its primary activity appears to be as an isomerase that catalyzes the conversion of hydroperoxy unsaturated fatty acids to their 1,5-epoxide, hydroxyl derivatives.
Lipoxygenases are found in eukaryotes (plants, fungi, animals, protists); while the third domain of terrestrial life, the archaea, possesses proteins with a slight (~20%) amino acid sequence similarity to lipoxygenases, these proteins lack iron-binding residues and therefore are not projected to possess lipoxygenase activity.