| Polyketide origin of pheromones of Carpophilus davidsoni and C. mutilatus (Coleoptera: Nitidulidae). | |
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MedLine Citation:
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PMID: 8733623 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Biosynthesis of pheromones from Carpophilus davidsoni Dobson and C. mutilatus Erichson was investigated by feeding the beetles diets containing isotopically substituted (13C and deuterium) fatty acids and then analyzing the resulting labeled pheromone components. (2E,4E,6E,8E)-7-Ethyl-3,5-dimethyl-2,4,6,8-undecate traene, (2E,4E,6E,8E)-3,5,7-trimethyl-2,4,6,8-undecatetraen e and (2E,4E,6E)-5-ethyl-3-methyl-2,4,6-nonatriene from C. davidsoni and (3E,5E,7E)-5-ethyl-7-methyl-3,5,7-undecatriene from C. mutilatus were abundant enough to be analyzed by both NMR spectroscopy and MS. Eleven additional minor analogues were analyzed only by MS. Each hydrocarbon can be assembled from just three different acyl units: The initial unit can be acetate, propionate or butyrate. Propionate is the second unit in all of the analogues encountered so far, extending the chain by two carbons and producing a methyl branch. Subsequent chain-extending units can be either propionate or butyrate, leading to additional methyl or ethyl branches, respectively. The final acyl unit is either propionate or butyrate and it loses its carboxyl carbon during hydrocarbon biosynthesis. A hydrocarbon with four total units is a triene and one with five is a tetraene. Assembly is proposed to be as in usual fatty acid anabolism, except that other precursor units are used in addition to acetate and that the double-bond reduction step of each chain-elongation cycle does not occur, leaving the conjugated, unsaturated system. Seven of the analyzed hydrocarbons were not previously known to occur in C. davidsoni; two of these are novel: (2E,4E,6E,8E)-5,7-diethyl-3-methyl-2,4,6,8-undecate traene and (2E,4E,6E)-3,5-dimethyl-2,4,6-octatriene. |
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Authors:
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R J Bartelt; D Weisleder |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Bioorganic & medicinal chemistry Volume: 4 ISSN: 0968-0896 ISO Abbreviation: Bioorg. Med. Chem. Publication Date: 1996 Mar |
Date Detail:
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Created Date: 1996-10-24 Completed Date: 1996-10-24 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 9413298 Medline TA: Bioorg Med Chem Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 429-38 Citation Subset: IM |
Affiliation:
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Bioactive Constituents Unit, USDA Agricultural Research Service, National Center for Agricultural Utilization Research, Peoria, IL 61604, USA. |
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 Beetles / metabolism* Female Magnetic Resonance Spectroscopy Male Mass Spectrometry Propionates Sex Attractants / biosynthesis* |
| Chemical | |
Reg. No./Substance:
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0/Aldehydes; 0/Propionates; 0/Sex Attractants; 124-25-4/tetradecanal |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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