Methylguanidine (MG)-synthesizing enzyme was purified from rat kidney lysosomes and peroxisomes. The enzyme was a flavoprotein with a molecular weight of about 37,000 and oxidized creatol to produce MG. The present results suggest that the reaction mechanism of this enzyme is different from that of L-gulono-gamma-lactone oxidase (EC 1.1.3.8) isolated from rat liver microsomes.
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Yokozawa et al. (2008) studied this question.