Abstract
Cytochrome P-450 enzymes have been isolated from bacteria, microsomes, and mitochondria and catalyze the insertion of one atom of dioxygen into substrate while the other is reduced to water. The biological and many of the physical properties of these enzymes are summarized elsewhere (Hill et al., 1970a; Ullrich, 1972; Gunsalus et al., 1973; Tomaszewski et al., 1974). Substantial clarification of the nature of P-450 dependent oxygenase reactions has been afforded by isolation of the soluble cytochrome (P-450cam) from Pseudomonas putida grown on camphor. In vitro assembly of the of the enzyme system, which also includes an electron transfer chain comprised of a reductase and the 2Fe–2S protein putidaredoxin, has led to deduction of reaction sequence (1) (Tyson et al., 1972; Gunsalus et al., 1973). In this scheme S = substrate, ox = Fe(III), red = Fe(II), and s-red is the one-electron reduction product of the Fe(II)·O2 form. More recently microsomal P-450 cytochromes have been purified and enzyme systems assembled (Imai and Sato, 1974; van der Hoeven and Coon, 1974; Haugen et al., 1975; Guengerich et al., 1975).
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Holm, R.H. et al. (1976). Model System Studies of Axial Ligation in the Oxidized Reaction States of Cytochrome P-450 Enzymes. In: Yasunodu, K.T., Mower, H.F., Hayaishi, O. (eds) Iron and Copper Proteins. Advances in Experimental Medicine and Biology, vol 74. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-3270-1_25
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