Expression system of CotA-laccase for directed evolution and high-throughput screenings for the oxidation of high-redox potential dyes

被引：44
作者：
Brissos, Vânia [1 ]
Pereira, Luciana [1 ]
Munteanu, Florentina-Daniela [2 ]
Cavaco-Paulo, Artur [2 ]
Martins, Lígia O. [1 ]
机构：
[1] Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, 2781-901 Oeiras, Av. Da República
[2] Universidade do Minho, Departamento de Engenharia Têxtil, Guimarães
来源：
Biotechnology Journal | 2009年 / 4卷 / 04期
关键词：
Directed evoluti1on; Expression systems; High redox dyes; High-throughput screening assays; Laccases;
D O I：
10.1002/biot.200800248
中图分类号：
学科分类号：
摘要：
Laccases are useful biocatalysts for many diverse biotechnological applications. In this study we have established efficient and reliable expression systems and high-throughput screenings for the recombinant CotA-laccase from Bacillus subtilis. The expression levels of cotA-laccase were compared in five different Escherichia coli host strains growing in 96-well microtiter plates under different culture conditions. Lower coefficients of variance (around 15%) were achieved using crude cell lysates of BL21 and KRX host strains growing under microaerobic conditions. Reproducible highthroughput screenings for the decolorization of high redox potential azo and anthraquinonic dyes were developed and optimized for identification of variants with increased redox potential. The enzymatic assays developed were tested for the screening of one mutant library from CotA-laccase created by error-prone PCR. © 2009 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
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页码：558 / 563
页数：5
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