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- W2939220643 abstract "Fungal high-redox-potential laccases (HRPLs) are multicopper oxidases with a relaxed substrate specificity that is highly dependent on their binding affinity and redox potential of the T1Cu site (ET1). In this study, we combined computational design with directed evolution to tailor an HRPL variant with increased ET1 and activity toward high-redox-potential mediators as well as enhanced stability. Laccase mutant libraries were screened in vitro using synthetic high-redox-potential mediators with different oxidation routes and chemical natures, while computer-aided evolution experiments were run in parallel to guide benchtop mutagenesis, without compromising protein stability. Through this strategy, the ET1 of the evolved HRPL increased from 740 to 790 mV, with a concomitant improvement in thermal and acidic pH stability. The kinetic constants for high-redox-potential mediators were markedly improved and were then successfully tested within laccase mediator systems (LMSs). Two hydrophobic substitutions surrounding the T1Cu site appeared to underlie these effects, and they were rationalized at the atomic level. Together, this study represents a proof-of-concept of the joint elevation of the ET1, redox mediator activity, and stability in an HRPL, making this versatile biocatalyst a promising candidate for future LMS applications and for the development of bioelectrochemical devices." @default.
- W2939220643 created "2019-04-25" @default.
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- W2939220643 date "2019-04-11" @default.
- W2939220643 modified "2023-10-06" @default.
- W2939220643 title "Increasing Redox Potential, Redox Mediator Activity, and Stability in a Fungal Laccase by Computer-Guided Mutagenesis and Directed Evolution" @default.
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- W2939220643 doi "https://doi.org/10.1021/acscatal.9b00531" @default.
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