Synthesis of Super-High-Viscosity Poly-γ-Glutamic Acid by -Deficient Strain of and Its Application in Microalgae Harvesting.

Poly-γ-glutamic acid (γ-PGA) is a natural polymer whose molecular weight and viscosity are critical for its application in various fields. However, research on super-high-molecular-weight or -viscosity γ-PGA is limited. In this study, the gene in WX-02 was knocked out using homologous recombination, and the batch fermentation performances of the recombinant strain WX-ΔpgdS were compared to those of WX-02.