Identification of a Bidirectional Promoter from Trichoderma reesei and Its Application in Dual Gene Expression.
Identification of a Bidirectional Promoter from Trichoderma reesei and Its Application in Dual Gene Expression.
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DOI：
10.3390/jof8101059
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发表时间：
2022-10-10
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The cellulolytic filamentous fungus Trichoderma reesei has a strong capability in protein synthesis and secretion and is increasingly used as a fungal chassis for the production of heterologous proteins or secondary metabolites. However, bidirectional promoters that would significantly facilitate multiple genes’ expression have not been characterized in T. reesei. Herein, we show that a 767-bp intergenic region between two polyketide synthase encoding genes that were involved in the biosynthesis of the typical yellow pigment served as a bidirectional promoter in T. reesei. This region was shown to be able to drive the simultaneous expression of two fluorescence reporter genes when fused to each end. Quantitative RT-PCR analysis demonstrated that the driving strength of this bidirectional promoter from each direction reached about half of that of the commonly used promoter PgpdA. Moreover, the co-expression of two cellulase genes driven by this bidirectional promoter enabled T. reesei to produce cellulases on glucose and improved the total cellulase activities with cellulose Avicel as the carbon source. Our work identified the first bidirectional promoter in T. reesei, which would facilitate gene co-expression and find applications in synthetic biology using fungal systems.
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