دورية
Switching the substrate preference of fungal aryl-alcohol oxidase: towards stereoselective oxidation of secondary benzyl alcoholsElectronic supplementary information (ESI) available. See DOI: 10.1039/c8cy02447b
| العنوان: | Switching the substrate preference of fungal aryl-alcohol oxidase: towards stereoselective oxidation of secondary benzyl alcoholsElectronic supplementary information (ESI) available. See DOI: 10.1039/c8cy02447b |
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| المؤلفون: | SerranoThese two authors equally contributed to the work., Ana, Sancho, Ferran, Viña-González, Javier, Carro, Juan, Alcalde, Miguel, Guallar, Victor, Martínez, Angel T. |
| المصدر: | Catalysis Science & Technology; 2019, Vol. 9 Issue: 3 p833-841, 9p |
| مستخلص: | Oxidation of primary alcohols by aryl-alcohol oxidase (AAO), a flavoenzyme that provides H2O2to fungal peroxidases for lignin degradation in nature, is achieved by concerted hydroxyl proton transfer and stereoselective hydride abstraction from the pro-Rbenzylic position. In racemic secondary alcohols, the R-hydrogen abstraction would result in the selective oxidation of the S-enantiomer to the corresponding ketone. This stereoselectivity of AAO may be exploited for enzymatic deracemization of chiral mixtures and isolation of R-enantiomers of industrial interest by switching the enzyme activity from primary to secondary alcohols. A combination of computational simulations and mutagenesis has been used to produce AAO variants with increased activity on secondary alcohols, using the already available F501A variant of Pleurotus eryngiiAAO as a starting point. Adaptive-PELE simulations for the diffusion of (S)-1-(p-methoxyphenyl)-ethanol in this variant allowed Ile500 to be identified as one of the key residues with a higher number of contacts with the substrate during its transition from the solvent to the active site. Substitution of Ile500 produced more efficient variants for the oxidation of several secondary alcohols, and the I500M/F501W double variant was able to fully oxidize (after 75 min) with high selectivity (ee >99%) the S-enantiomer of the model secondary aryl-alcohol (±)-1-(p-methoxyphenyl)-ethanol, while the R-enantiomer remained unreacted. |
| قاعدة البيانات: | Supplemental Index |
| تدمد: | 20444753 20444761 |
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| DOI: | 10.1039/c8cy02447b |