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1. The rates of detoxification of cycloheximide (33 mug/g fresh wt.), puromycin (167 mug/g fresh wt.) and actinomycin D (1 mug/g fresh wt.) were assessed in vivo on the basis of acid-insoluble [14C]leucine incorporation in the sheep blowfly, Lucilla cuprina; these were compared with quantitative estimates which took account not only of incorporation data but also of leucine pool size and turnover. Quantitatively, cycloheximide and puromycin were still at least 50% effective in inhibiting protein synthesis after 6.5 and 24.5h of exposure respectively, whereas values based only on incorporation data suggested that cycloheximide was 83% effective and puromycin completely ineffective after the respective periods. Quantitative estimates also showed that actinomycin D effectiveness increased with increasing exposure over 24.5h, in contrast with values based only on incorporation data, which suggested that it was completely ineffective after 24h.2. All inhibitors affected the dynamic state of the amino acid pool; there was a marked decrease in the rate of leucine-pool turnover as well as an increase in the half-life of leucine in the pool. 3. Inhibition of protein synthesis resulted in changes in leucine-pool size; the most pronounced increase occurred with cycloheximide and puromycin and the most pronounced decreases with actinomycin D. 4. Evidence is presented which suggests that proteolysis is functionally linked to protein synthesis, which determines its rate indirectly.

The effect of inhibitors in vivo on protein synthesis and the amino acid pool in the sheep blowfly, Lucilia cuprina