Egg protein insolubility inLymantria dispar versus other forest Lepidoptera |
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Authors: | MaryCarol Rossiter Diana Cox-Foster Mamdouh M. Abou-Zaid Diane Bergeron |
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Affiliation: | (1) Institute of Ecology, University of Georgia, 30602 Athens, GA, USA;(2) Department of Entomology, Pennsylvania State University, University Park, 16802, PA, USA;(3) Forest Pest Management Institute, Canadian Forest Service, P6A 5M7 Sault Ste. Marie, Ontario, Canada;(4) Département de Biologie, Université Laval, G1K 7P4 Ste-Foy, Québec, Canada |
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Abstract: | Summary A standard buffer (5 mM phosphate at pH 7) which is used to extract protein from insect eggs provided complete protein solubility for eggs from three of four tree-feeding lepidopteran species: obliquebanded leaf roller (Choristoneura rosaceana), forest tent caterpillar (Malacosoma disstria), and the eastern tent caterpillar (Malacosoma americanum). Under the same extraction protocol, egg proteins from the gypsy moth (Lymantria dispar), remained nearly insoluble. An array of methods typically used to solubilize insect egg proteins were tried and all but the most denaturing (2% SDS) were ineffective. Extraction buffers with typically high pH values were then evaluated. The results indicated that 1) solubility of gypsy moth egg proteins was pH dependent, and full solubility of most egg proteins required the extraction buffer to have a pH of 12 or more prior to the addition of eggs. We also determined that 2) the gypsy moth egg has a buffering capacity which must be surpassed for complete protein extraction, 3) low salt/high pH buffers gave slightly higher total protein values than did high salt/high pH buffers, 4) parental nutritional history (host species utilized) and egg developmental state (pre-embryonatedvs postembryonated/pre-hatch) were unrelated to the requirements for complete egg protein solubilization, and 5) the presence of soluble phenolics, compounds that have the potential to bind to protein and cause insolubility, was confirmed for the gypsy moth egg with 2-D paper chromatography and several other tests. Based on these results, we present a hypothesis about the cause of egg protein insolubility in the gypsy moth. |
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Keywords: | protein solubility insect yolk protein buffering capacity phenolics Lepidoptera gypsy moth Lymantria dispar Malacosoma disstria Choristoneura rosaceana |
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