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Alkaline polygalacturonate lyase (PGL), which was the central enzyme of green environmental enzyme treatment technology, has been widely used in textile, papermaking and beverage production. In the previous work,  Bacillus subtilis  was used as the expression host, and the PGL gene derived from  B. subtilis  WSHB04-02 was successfully expressed in the engineered strain WB43CB by regulating of molecular elements such as signal peptide, promoter and SD sequence. In this study, the fermentation medium was optimized from four aspects of carbon source, nitrogen source, liquid volume and inoculum volume, and the extracellular PGL enzyme activity in WB43CB increased from 264.5 U·mL -1  to 461.96 U·mL -1 , which laid a solid foundation for the industrial production of PGL.

Increased production of alkaline polygalacturonate lyase in the recombinant WB43CB by optimizing the medium