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Conformational transitions and redox potential shifts of cytochrome P450 induced by immobilization

Item Type:Article
Title:Conformational transitions and redox potential shifts of cytochrome P450 induced by immobilization
Creators Name:Todorovic, S. and Jung, C. and Hildebrandt, P. and Murgida, D.H.
Abstract:Cytochrome P450 (P450) from Pseudomonas putida was immobilized on Ag electrodes coated with self-assembled monolayers (SAMs) via electrostatic and hydrophobic interactions as well as by covalent cross-linking. The redox and conformational equilibria of the immobilized protein were studied by potential-dependent surface-enhanced resonance Raman spectroscopy. All immobilization conditions lead to the formation of the cytochrome P420 (P420) form of the enzyme. The redox potential of the electrostatically adsorbed P420 is significantly more positive than in solution and shows a steady downshift upon shortening of the length of the carboxyl-terminated SAMs, i.e., upon increasing the strength of the local electric field. Thus, two opposing effects modulate the redox potential of the adsorbed enzyme. First, the increased hydrophobicity of the heme environment brought about by immobilization on the SAM tends to upshift the redox potential by stabilizing the formally neutral ferrous form. Second, increasing electric fields tend to stabilize the positively charged ferric form, producing the opposite effect. The results provide insight into the parameters that control the structure and redox properties of heme proteins and contribute to the understanding of the apparently anomalous behavior of P450 enzymes in bioelectronic devices.
Keywords:Cytochrome P450, Enzyme Immobilisation, Electrostatic interactions, Redox Potential, Surface-Enhanced Resonance Raman Spectroscopy
Source:Journal of Biological Inorganic Chemistry
Page Range:119-127
Date:January 2006
Official Publication:https://doi.org/10.1007/s00775-005-0054-9
PubMed:View item in PubMed

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