Abstract:
: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.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Hallahan DL,Nugent JH,Hallahan BJ,Dawson GW,Smiley DW,West JM,Wallsgrove RMdoi
10.1104/pp.98.4.1290subject
Has Abstractpub_date
1992-04-01 00:00:00pages
1290-7issue
4eissn
0032-0889issn
1532-2548journal_volume
98pub_type
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