Engineering P450 LaMO stereospecificity and product selectivity for selective C–H oxidation of tetralin-like alkylbenzenes
The P450-mediated asymmetric hydroxylation of inert C–H bonds is a chemically challenging reaction. Self-sufficient P450 LaMO from the CYP116B subfamily could catalyze the transformation of 1,2,3,4-tetrahydronaphthalene to ( S )-tetralol, despite its poor enantioselectivity (er 66 : 34) and product...
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Veröffentlicht in: | Catalysis science & technology 2018, Vol.8 (18), p.4638-4644 |
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Hauptverfasser: | , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The P450-mediated asymmetric hydroxylation of inert C–H bonds is a chemically challenging reaction. Self-sufficient P450
LaMO
from the CYP116B subfamily could catalyze the transformation of 1,2,3,4-tetrahydronaphthalene to (
S
)-tetralol, despite its poor enantioselectivity (er 66 : 34) and product selectivity (the ratio of alcohol and ketone, ak, 76 : 24). To improve the selectivity, phenylalanine scanning and further protein engineering were performed to reshape the active pocket of P450
LaMO
, resulting in a mutant (T121V/Y385F/M391L) with not only improved (
S
)-enantioselectivity (er 98 : 2) but also excellent product selectivity (ak 99 : 1), in contrast to another mutant L97F/T121F/E282V/T283Y with complementary (
R
)-enantioselectivity (er 23 : 77). Moreover, the enantiopure (
S
)-alcohols formed by the P450
LaMO
-catalyzed oxidation of a series of alkylbenzenes are potentially important building blocks in the pharmaceutical industry. This Phe-based enantioselectivity engineering used for reshaping the active pocket of P450s could provide a guide to the protein evolution of other CYP116B members. |
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ISSN: | 2044-4753 2044-4761 |
DOI: | 10.1039/C8CY01448E |