Spectroscopic characterization of the iron-oxo intermediate in cytochrome P450
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Christiane Jung
, Volker Schünemann , Friedhelm Lendzian , Alfred X. Trautwein , Jörg Contzen , Marcus Galander , Lars H. Böttger , Matthias Richter and Anne-Laure Barra
Abstract
From analogy to chloroperoxidase from Caldariomyces fumago, it is believed that the electronic structure of the intermediate iron-oxo species in the catalytic cycle of cytochrome P450 corresponds to an iron(IV) porphyrin-π-cation radical (compound I). However, our recent studies on P450cam revealed that after 8 ms a tyrosine radical and iron(IV) were formed in the reaction of ferric P450 with external oxidants in the shunt pathway. The present study on the heme domain of P450BM3 (P450BMP) shows a similar result. In addition to a tyrosine radical, a contribution from a tryptophan radical was found in the electron paramagnetic resonance (EPR) spectra of P450BMP. Here we present comparative multi-frequency EPR (9.6, 94 and 285 GHz) and Mössbauer spectroscopic studies on freeze-quenched intermediates produced using peroxy acetic acid as oxidant for both P450 cytochromes. After 8 ms in both systems, amino acid radicals occurred instead of the proposed iron(IV) porphyrin-π-cation radical, which may be transiently formed on a much faster time scale. These findings are discussed with respect to other heme thiolate proteins. Our studies demonstrate that intramolecular electron transfer from aromatic amino acids is a common feature in these enzymes. The electron transfer quenches the presumably transiently formed porphyrin-π-cation radical, which makes it extremely difficult to trap compound I.
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Articles in the same Issue
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Articles in the same Issue
- Highlight: Radicals in Enzymatic Catalysis
- Radical-mediated dehydration reactions in anaerobic bacteria
- Heterodisulfide reductase from methanogenic archaea: a new catalytic role for an iron-sulfur cluster
- Structural and functional comparison of HemN to other radical SAM enzymes
- New glycyl radical enzymes catalysing key metabolic steps in anaerobic bacteria
- Unusual reactions involved in anaerobic metabolism of phenolic compounds
- Novel bacterial molybdenum and tungsten enzymes: three-dimensional structure, spectroscopy, and reaction mechanism
- Spectroscopic and theoretical approaches for studying radical reactions in class I ribonucleotide reductase
- Biomimetic metal-radical reactivity: aerial oxidation of alcohols, amines, aminophenols and catechols catalyzed by transition metal complexes
- Combinatorial approaches to functional models for galactose oxidase
- Spectroscopic characterization of the iron-oxo intermediate in cytochrome P450
- Impact of Mycoplasma hyorhinis infection on l-arginine metabolism: differential regulation of the human and murine iNOS gene
- Degradation of the sodium taurocholate cotransporting polypeptide (NTCP) by the ubiquitin-proteasome system
- Identification of three novel mutations in the dihydropyrimidine dehydrogenase gene associated with altered pre-mRNA splicing or protein function