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The macaque is widely used for investigation of drug metabolism due to its evolutionary closeness to the human. However, the genetic backgrounds of drug-metabolizing enzymes have not been fully investigated; therefore, identification and characterization of drug-metabolizing enzyme genes are important for understanding drug metabolism in this species. In this study, we isolated and characterized a novel cytochrome P450 2C18 (CYP2C18) cDNA in cynomolgus macaques. This cDNA was highly homologous (96%) to human CYP2C18 cDNA. Cynomolgus CYP2C18 was preferentially expressed in the liver and kidney. Moreover, a metabolic assay using cynomolgus CYP2C18 protein heterologously expressed in Escherichia coli revealed its activity toward S-mephenytoin 4'-hydroxylation. These results suggest that cynomolgus CYP2C18 could function as a drug-metabolizing enzyme in the liver.

Identification and Characterization of CYP2C18 in the Cynomolgus Macaque (Macaca fascicularis)