Abstract
Daidzein C6 hydroxylase (6-DH, nfa12130), which is a class I type of cytochrome P450 enzyme, catalyzes a hydroxylation reaction at the C6-position of the daidzein A-ring and requires auxiliary electron transfer proteins. Current utilization of cytochrome P450 (CYP) enzymes is limited by low coupling efficiency, which necessitates extramolecular electron transfers, and low driving forces, which derive electron flows from tightly regulated NADPH redox balances into the heterogeneous CYP catalytic cycle. To overcome such limitations, the heme domain of the 6-DH enzyme was genetically fused with the NADPH-reductase domain of self-sufficient CYP102D1 to enhance electron transfer efficiencies through intramolecular electron transfer and switching cofactor preference from NADH into NADPH. 6-DH-reductase fusion enzyme displayed distinct spectral properties of both flavoprotein and heme proteins and catalyzed daidzein hydroxylation more efficiently with a k cat/K m value of 120.3 ± 11.5 [103 M−1 s−1], which was about three times higher than that of the 6-DH-FdxC-FdrA reconstituted system. Moreover, to obtain a higher redox driving force, a Streptomyces avermitilis host system was developed for heterologous expression of fusion 6-DH enzyme and whole cell biotransformation of daidzein. The whole cell reaction using the final recombinant strain, S. avermitilisΔcyp105D7::fusion 6-DH (nfa12130), resulted in 8.3 ± 1.4 % of 6-OHD yield from 25.4 mg/L of daidzein.
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Acknowledgments
This work was supported by the Intelligent Synthetic Biology Center of Global Frontier Project funded by the Ministry of Science, ICT&Future Planning (2013060084). And this work was also partially supported by the Energy Efficiency & Resources of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea Government Ministry of Trade, Industry and Energy (20133030000300) and Polar Academic Program (PAP, PD13010) from KOPRI. We thank Prof. Hattori from Kitasato University in Japan for donating Nocardia farcinica IFM10152.
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Choi, KY., Jung, E., Yun, H. et al. Engineering class I cytochrome P450 by gene fusion with NADPH-dependent reductase and S. avermitilis host development for daidzein biotransformation. Appl Microbiol Biotechnol 98, 8191–8200 (2014). https://doi.org/10.1007/s00253-014-5706-7
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DOI: https://doi.org/10.1007/s00253-014-5706-7