Titration and assignment of residues that regulate the enantioselectivity of phenylacetone monooxygenase
2007
Phenylacetone monooxygense (PAMO) from Thermobifida fusca was employed for the asymmetric oxidation of thioanisole (sulfooxidation) and of racemic 2-phenylpropionaldehyde (Baeyer-Villiger oxidation). A pH dependence of enantioselectivity was observed in both cases. Two different residues, with pK(a) values of 7.8 +/- 0.2 and 9.2 +/- 0.2, appeared to be responsible for the pH effects on PAMO enantioselectivity. The protonation of Arg337 and the FAD:C4a-hydroperoxide/FAD:C4a-peroxide equilibrium were identified as the major factors responsible for the fine-tuning of PAMO enantioselectivity in Baeyer-Villiger oxidation and sulfooxidation, respectively.
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