Abstract
Chymostatin is a small nonprotein polyamino acid that specifically inhibits chymotrypsinlike enzymes by covalently binding to their active site It is therefore a model for tightbinding proteinaceous protease inhibitors of chymotrypsin/elastase specificity The Lepidopteran Helicoverpa armigera was raised on an artificial diet containing 003 chymostatin After 14 days the experimental animals were approximately twentyfold smaller than the controls although there was no increase in mortality The RNA expression levels of the main trypsin gene group were found to decrease while that of the chymotrypsin/elastase gene group increased Changes in activity of the midgut protease enzymes did not correlate to these changes in RNA expression
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