Abstract
Enzymatic transformation is now an attractive alternative for α-ketoglutaric acid (α-KG) production, but the oxidative deamination from L-glutamic acid to α-KG is along with H2O2 accumulation. To remove the effect of H2O2 on α-KG production, in vitro cascade biocatalysis was designed using the purified L-glutamate oxidase (LGOX) from Streptomyces ghanaensis and catalase (KatG) from Escherichia coli W3110, and the optimal ratio of LGOX:KatG (2.0:1250) was detected in this system. To achieve this ratio, in vivo cascade biocatalysis was constructed by varying promoters and ribosome binding sites (RBSs), and optimized by promoter engineering, such as adjusting the junctions between the SD sequence and start codon ATG and tuning the strengths of RBSs. When the final ratio of LGOX:KatG (2.1:1185) in strain E. coli-(T7)LGOX-(rbs2)KatG was used, α-KG concentration and its conversion rate were increased to 106gL-1 and 96%, respectively. This strategy described here paves the way to the development of cascade biocatalysis for enzymatic production of other chemicals.
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