| Allene oxide and aldehyde biosynthesis in starfish oocytes. | |
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MedLine Citation:
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PMID: 1744085 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Allene oxides are a very unusual type of epoxide that, in biological systems, are formed by the enzymic dehydration of fatty acid hydroperoxides (lipoxygenase products). This reaction occurs widely in plants, in which allene oxide synthesis is a key step in the conversion of linolenic acid to jasmonic acid, the plant growth regulator. We report biosynthesis of the allene oxide (8R)-8,9-epoxyeicosa-(5Z,9,11Z,14Z)-tetraenoic acid via the (8R)-lipoxygenase metabolism of arachidonic acid in starfish oocytes. Formation of the allene oxide was deduced from high pressure liquid chromatography, UV, gas chromatography-mass spectrometry and 1H-NMR analyses of the precise structure and mechanism of biosynthesis of its major hydrolysis product, the alpha-ketol 8-hydroxy-9-ketoeicosa-(5Z,11Z,14Z)-trienoic acid. A second enzymic activity detected in the oocytes (hydroperoxide lyase) cleaves specifically the (8R)-hydroperoxy substrate into C7 and C13 fragments, identified as the hydroxyacid, (5Z)-7-hydroxyheptenoic acid, and two aldehydes, (2E,4Z,7Z)-tridecenal and its 4E isomer. Discovery of the allene oxide synthase and hydroperoxide lyase marks the first definitive localization of these enzymic activities to an animal cell. It was established previously that the (8R)-lipoxygenase metabolite (8R)-HETE will activate the maturation (re-initiation of meiosis) of starfish oocytes. The individual 8-lipoxygenase products may be involved at distinct stages of cell development. |
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Authors:
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A R Brash; M A Hughes; D J Hawkins; W E Boeglin; W C Song; L Meijer |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
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Title: The Journal of biological chemistry Volume: 266 ISSN: 0021-9258 ISO Abbreviation: J. Biol. Chem. Publication Date: 1991 Dec |
Date Detail:
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Created Date: 1992-01-13 Completed Date: 1992-01-13 Revised Date: 2007-11-14 |
Medline Journal Info:
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Nlm Unique ID: 2985121R Medline TA: J Biol Chem Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 22926-31 Citation Subset: IM |
Affiliation:
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Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-6602. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Aldehydes
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metabolism* Animals Arachidonic Acid / metabolism Chromatography, High Pressure Liquid Epoxy Compounds / metabolism* Hydrogen Peroxide / metabolism Hydroxyeicosatetraenoic Acids / metabolism Magnetic Resonance Spectroscopy Mass Spectrometry Oocytes / metabolism* Starfish |
| Grant Support | |
ID/Acronym/Agency:
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DK-35275/DK/NIDDK NIH HHS; GM-15431/GM/NIGMS NIH HHS; HD-05797/HD/NICHD NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Aldehydes; 0/Epoxy Compounds; 0/Hydroxyeicosatetraenoic Acids; 506-32-1/Arachidonic Acid; 7722-84-1/Hydrogen Peroxide |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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