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• W2139567398 abstract "Reliable screening methods are being demanded by biocatalysts' engineers, especially when some features such as activity or stability are targets to improve under non-natural conditions (i.e., in the presence of organic solvents). The current work describes a protocol for the design of a fungal laccase-expressed in Saccharomyces cerevisiae-highly active in organic cosolvents. A high-throughput screening assay based on ABTS (2,2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid)) oxidation was validated. The stability of the ABTS radical cation was not significantly altered in the presence of acetonitrile, ethanol, or DMSO. With a coefficient of variance below 10% and a sensitivity limit of 15 pg laccase/microL, the assay was reproducible and sensitive. The expression system of Myceliophthora thermophila laccase variant T2 in S. cerevisiae was highly dependent on the presence of Cu2+. Copper concentration was limited up to 10 microM CuSO4 where expression levels (approximately 14-18 mg/L) were acceptable without compromising the reliability of the assay. A mutant library was created by error-prone PCR with 1.1 to 3.5 mutations per kb. After only 1 generation of directed evolution, mutant 6C9 displayed about 3.5-fold higher activities than parent type in the presence of 20% acetonitrile or 30% ethanol. The method provided here should be generally useful to improve the activity of other redox enzymes in mixtures of water/cosolvents." @default.
• W2139567398 created "2016-06-24" @default.
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• W2139567398 date "2005-09-01" @default.
• W2139567398 modified "2023-10-16" @default.
• W2139567398 title "Screening Mutant Libraries of Fungal Laccases in the Presence of Organic Solvents" @default.
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• W2139567398 doi "https://doi.org/10.1177/1087057105277058" @default.
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