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Ammonia utilization by the bruchid beetle,Caryedes brasiliensis [Bruchidae]
1T.H. Morgan School of Biological Sciences and the Graduate Center for Toxicology, University of Kentucky, 40506, Lexington, Kentucky.
Abstract:
The seed predator,Caryedes brasiliensis [Bruchidae] generates appreciable ammonia in its dietary use and detoxification ofL-canavanine and its catabolic product,L-canaline.L-Canavanine is a toxic allelochemical ofDioclea megacarpa seeds, the food of the developing larvae. Bruchid beetle larvae rely upon glutamic acid dehydrogenase and glutamine synthetase to use ammonia for glutamic acid synthesis from 2-oxoglutaric acid and conversion of the former to glutamine. These reactions provide the larvae with a means for metabolically eliminating ammonia. Proline serves as a carbon skeleton source for glutamic acid formation.
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