Abstract
The heterologous protein expression in Pichia pastoris under the control of alcohol oxidase (AOX1)promoter comprises two steps, the growth and induction phases, which are time-consuming and technically demanding. Here, we describe an alternate method where expression is carried out directly in the methanol-containing medium. Using this method, we were successful in screening high-activity laccase clones from a library of laccase mutants generated by random mutagenesis. This simplified method not only saves time but also is highly efficient and can be used for screening a large number of clones.
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