Abstract
Wild-type cytochrome P450 monooxygenase from Bacillus megaterium (P450 BM-3) has a low hydroxylation activity for β-ionone (<1 min−1). Substitution of phenylalanine by valine at position 87 led to a more than 100-fold increase in β-ionone hydroxylation activity (115 min−1). Enzyme activity could be further increased by both site-directed and random mutagenesis. The mutant R47L Y51F F87V, designed by site-directed mutagenesis, and the mutant A74E F87V P386S, obtained after two rounds of error-prone polymerase chain reaction, exhibited an increase in activity of up to 300-fold compared to the wild-type enzyme. The triple mutant R47 LY51F F87V exhibited moderate enantioselectivity, forming (R)-4-hydroxy-β-ionone with an optical purity of 39%. All mutants regioselectively converted β-ionone into 4-hydroxy-β-ionone. The regioselectivity is determined amongst others by the absolute configuration of the substrate.
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Acknowledgements
We would like to thank BASF AG for providing 3-hydroxy-β-ionone. This work has been supported by the German Research Foundation (DFG; Project SCHM 1240/6-1).
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Urlacher, V.B., Makhsumkhanov, A. & Schmid, R.D. Biotransformation of β-ionone by engineered cytochrome P450 BM-3. Appl Microbiol Biotechnol 70, 53–59 (2006). https://doi.org/10.1007/s00253-005-0028-4
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DOI: https://doi.org/10.1007/s00253-005-0028-4