Using a synthetic machinery to improve carbon yield with acetylphosphate as the core.

Likun Guo, Min Liu, Yujia Bi, Qingsheng Qi, Mo Xian, Guang Zhao

Nature communications 2023 Aug 30

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In microbial cell factory, CO2 release during acetyl-CoA production from pyruvate significantly decreases the carbon atom economy. Here, we construct and optimize a synthetic carbon conserving pathway named as Sedoheptulose-1,7-bisphosphatase Cycle with Trifunctional PhosphoKetolase (SCTPK) in Escherichia coli. This cycle relies on a generalist phosphoketolase Xfspk and converts glucose into the stoichiometric amounts of acetylphosphate (AcP). Furthermore, genetic circuits responding to AcP positively or negatively are created. Together with SCTPK, they constitute a gene-metabolic oscillator that regulates Xfspk and enzymes converting AcP into valuable chemicals in response to intracellular AcP level autonomously, allocating metabolic flux rationally and improving the carbon atom economy of bioconversion process. Using this synthetic machinery, mevalonate is produced with a yield higher than its native theoretical yield, and the highest titer and yield of 3-hydroxypropionate via malonyl-CoA pathway are achieved. This study provides a strategy for improving the carbon yield of microbial cell factories. © 2023. Springer Nature Limited.

Citation

Likun Guo, Min Liu, Yujia Bi, Qingsheng Qi, Mo Xian, Guang Zhao. Using a synthetic machinery to improve carbon yield with acetylphosphate as the core. Nature communications. 2023 Aug 30;14(1):5286