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Studies on Carboxyesterase in Malathion-Resistant Culextarsalis

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The concentration of carboxyesterase, under mono factorial genetic control, was determined to be 13 times as great in the R as in the S larval homozygotes. It was purified at least 100 times, and separated from phosphatase activity, by column chromatography through DEAE cellulose. The enzyme proved to he a single protein, M.W. 16,000, in both Rand S material. R and S enzymes carried the same anionic electrophoretic charge, and showed identical U-V spectra. The R enzyme differed from the S enzyme in being acid-precipitable at pH 5, and much more heat-labile at 30.; its dephosphorylation constant and turn-over number appeared to be slightly lower. The carboxyesterase was particularly abundant in the gut, from which phosphatase was found to be absent.

Document Type: Research Article

Publication date: June 1, 1963

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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