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The FASEB Journal, Vol 6, 695-699, Copyright © 1992 by The Federation of American Societies for Experimental Biology

REVIEWS

Mechanism-based probes of the topology and function of fatty acid hydroxylases

PR Ortiz de Montellano, WK Chan, SF Tuck, RM Kaikaus, NM Bass and JA Peterson
Department of Pharmaceutical Chemistry, University of California, San Francisco 94143-0446.

The use of three mechanism-based probes to investigate the topology and function of fatty acid hydroxylases is discussed. 1) The observation of protein rather than heme alkylation in the reaction of cytochrome P4504A1 with 10-undecynoic acid supports the argument that the enzyme circumvents the inherent preference for omega-1 hydroxylation by restricting access to the ferryl oxygen. 2) The regiochemistry of the ferricyanide-mediated iron-to-nitrogen shift of the cytochrome P450102 (P450BM-3) phenyl-iron complex indicates that the active site of this bacterial fatty acid hydroxylase is open primarily above pyrrole ring A of the prosthetic heme group, 3) Inhibition of clofibrate-mediated peroxisome proliferation in cultured rat hepatocytes by inactivation of cytochrome P4504A1 indicates that omega-hydroxylation of fatty acids provides a signal for peroxisome proliferation.


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Copyright © 1992 by The Federation of American Societies for Experimental Biology.