Abstract
Mobil Crystalline Material (MCM-41) can be used for the immobilization of enzymes and the investigation of electron transfer in biological systems. Electron transfer between MCM-41 with aluminum (Al-MCM-41) and cytochrome P-450 (CYP2B4) was observed using electron paramagnetic resonance (EPR). When CYP2B4 was immobilized by adsorption, it catalyzed the conversion of aniline to p-aminophenol. The electron transfer was evidenced when the signal with a g value (also called g-factor or spectroscopic manifestation of the magnetic moment) of 1.98 increased at the same time that the signal with a g value 2.24 decreased due to the addition of NADPH to CYP2B4 immobilized on Al-MCM-41, indicating that FeIII was reduced to FeII. Therefore, it is possible that Al-MCM-41 participates in the electron transfer process in biological systems.
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Acknowledgements
The authors thank CONACYT and COFAA-SIP/IPN for financial support and the Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, US Department of Energy for operational support at the University of Alabama and the National Science Foundation for EPR Instrument Grants CHE-0342921 and CHE-0079498 at the same place. We thank Ignacio Colin and Rogelio Ruiz for technical support in the EPR measurements.
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Rosales-Hernández, M., Kispert, L., Torres-Ramírez, E. et al. Electron paramagnetic resonance analyses of biotransformation reactions with cytochrome P-450 immobilized on mesoporous molecular sieves. Biotechnol Lett 29, 919–924 (2007). https://doi.org/10.1007/s10529-007-9328-3
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DOI: https://doi.org/10.1007/s10529-007-9328-3