Biosynthesis of Liver Catalase in Rats Treated with Allylisopropylacetylcarbamide

II. Double-labeling of Catalase with [¹⁴C] Leucine and δ-[³H] Aminolevulinic Acid

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Double-labeling of liver catalase [EC 1. 11. 1. 6] with [¹⁴C] leucine and δ-[³H] arninolevulinic acid was carried out both in vivo and in vitro using rats treated with allylisopropylacetylcarbamide (Sedormid). These radioactive precursors were incorporated into catalase at a lower rate than in normal rats. In particular, the incorporation of ³H was remarkably inhibited. The results suggest that the administration of Sedormid can inhibit synthesis of the protein moiety of catalase, and possibly interfere with the binding of heme to the catalase protein.