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Abstract
1. 2,4-Toluenediamine was incubated with liver cytosol from various species, or cytosol from various tissues of the hamster or rabbit, in the presence of [1-14C]acetyl-CoA. N-Acetylation occurred selectively at the p-amino group of 2,4-toluenediamine and to a much lesser extent on the o-amino group.
2. In hamsters and rabbits the highest N-acetyltransferase activity was present in the liver cytosol, followed by kidney, intestinal mucosa and lung cytosols.
3. Hamster liver cytosol had the greatest activity followed by liver cytosols from guinea-pig, rabbit, mouse and rat. With human liver cytosol only a trace of an N-acetyl derivative of 2,4-toluenediamine was found while dog liver cytosol showed no activity.
4. N-Acetyltransferase activity was maximal at pH 7·5 in mouse, pH 6·0 in rat and man, and pH 7·0 in rabbit liver cytosols.
5. There was a slight difference in the levels of N-acetyltransferases in males and females; the female mouse had more enzyme activity than the male, but the male rat had more enzyme activity than the female