Engineered Bacillus subtilis 168 produces L-malate by heterologous biosynthesis pathway construction and lactate dehydrogenase deletion.

Li Mu, Jianping Wen

World journal of microbiology & biotechnology 2013 Jan

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In the present work, Bacillus subtilis was engineered to produce L-malate. Initially, the study revealed that the slight fumarase activity under anaerobic conditions is extremely favourable for L-malate one-step fermentation accumulation. Subsequently, an efficient heterologous biosynthesis pathway formed by Escherichia coli phosphoenolpyruvate carboxylase and Saccharomyces cerevisiae malate dehydrogenase was introduced into B. subtilis, which led to 6.04 ± 0.19 mM L-malate production. Finally, the L-malate production was increased 1.5-fold to 9.18 ± 0.22 mM by the deletion of lactate dehydrogenase. Under two-stage fermentation conditions, the engineered B. subtilis produced up to 15.65 ± 0.13 mM L-malate, which was 86.3 % higher than that under anaerobic fermentation conditions. Though the L-malate production by the recombinant was low, this is the first attempt to produce L-malate in engineered B. subtilis and paves the way for further improving L-malate production in B. subtilis.

Citation

Li Mu, Jianping Wen. Engineered Bacillus subtilis 168 produces L-malate by heterologous biosynthesis pathway construction and lactate dehydrogenase deletion. World journal of microbiology & biotechnology. 2013 Jan;29(1):33-41