Cytochromes P450 are a group of heme-thiolate monooxygenases. In liver microsomes, this enzyme is involved in an NADPH-dependent electron transport pathway. It oxidizes a variety of structurally unrelated compounds, including steroids, fatty acids, and xenobiotics. The kidney P-450 system is rather specialized for the omega-hydroxylation of fatty acids. Both P450-KA1 and P450-KA2 catalyze the omega- and (omega-1)-hydroxylation of various fatty acids with no drug-metabolizing activity, and hydroxylate prostaglandin A1 and A2 solely at the omega-position. an omega-methyl-long-chain fatty acid + O2 + reduced [NADPH--hemoprotein reductase] = an omega-hydroxy-long-chain fatty acid + H(+) + H2O + oxidized [NADPH--hemoprotein reductase] Liver, kidney, small intestine. P450 can be induced to high levels in liver and other tissues by various foreign compounds, including drugs, pesticides, and carcinogens. Belongs to the cytochrome P450 family.