Plant Physiol.
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Plant Physiology 98:1290-1297 (1992)
© 1992 American Society of Plant Biologists

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Metabolism and Enzymology

Interactions of Avocado (Persea americana) Cytochrome P-450 with Monoterpenoids

David L. Hallahan, Jonathan H. A. Nugent, Beverly J. Hallahan, Glenn W. Dawson, Diane W. Smiley, Jevon M. West and Roger M. Wallsgrove

Biochemistry and Physiology Department, AFRC Institute of Arable Crops Research, Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ, United Kingdom, Insecticides and Fungicides Department, AFRC Institute of Arable Crops Research, Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ, United Kingdom, Department of Biology, University College London, Gower Street, London WC1E 6BT, United Kingdom

The microsomal fraction of avocado (Persea americana) mesocarp is a rich source of cytochrome P-450 active in the demethylation of xenobiotics. Cytochrome P-450 from this tissue has been purified and well characterized at the molecular level (DP O'Keefe, KJ Leto [1989] Plant Physiol 89: 1141-1149; KR Bozak, H Yu, R Sirevag, RE Christoffersen [1990] Proc Natl Acad Sci USA 87: 3904-3908). Despite this extensive characterization, the role of the enzyme in vivo was not established. Optical and electron paramagnetic resonance binding studies described here suggest that the monoterpenoids, nerol and geraniol, are substrates of avocado cytochrome P-450 (spectral dissociation constant of 7.2 and 35 micromolar, respectively). Avocado microsomes have been shown to catalyze the hydroxylation of these monoterpenoids, and both nerol and geraniol have been shown to inhibit the activity of avocado cytochrome P-450 toward the artificial substrate 7-ethoxycoumarin, with nerol a competitive inhibitor of this activity.






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Copyright © 1992 by the American Society of Plant Biologists