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• W4281476278 abstract "Malonate is a platform chemical that has been utilized to synthesize many valuable chemical compounds. Here, Saccharomyces cerevisiae was metabolically engineered to produce malonate through the malonyl-CoA pathway. To construct the key step of converting malonyl-CoA to malonate, a native mitochondrial 3-hydroxyisobutyryl-CoA hydrolase gene EHD3 was mutated to target the cytoplasm and obtain malonyl-CoA hydrolase activity. The malonyl-CoA hydrolase activity of Ehd3 was achieved by mutating the malonyl-CoA binding site F121 to I121 and the active site E124 to seven amino acids (S/T/H/K/R/N/Q). We identified that the strain with E124S mutation had the highest malonate titer with 13.6 mg/L. Genomic integration of the mutant EHD3 and ACC1** to delta sequence sites was further explored to increase their reliable expression. Accordingly, a screening method with the work flow of fluorescence detection, shake-tube fermentation, and shake-flask fermentation was constructed to screen high copy delta sequences efficiently. The malonate titer was improved to 73.55 mg/L after screening the ∼1500 integrative strains, which was increased 4.4-folds than that of the episomal strain. We further engineered the strain by regulating the expression of key enzyme in the malonyl-CoA pathway to improve the precursor supply and inhibiting its competing pathways, and the final engineered strain LMA-16 produced 187.25 mg/L in the flask, 14-fold compared with the initial episomal expression strain. Finally, the combined efforts increased the malonate titer to 1.62 g/L in fed-batch fermentation." @default.
• W4281476278 created "2022-05-26" @default.
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• W4281476278 date "2022-09-01" @default.
• W4281476278 modified "2023-10-17" @default.
• W4281476278 title "Metabolic engineering of the malonyl-CoA pathway to efficiently produce malonate in Saccharomyces cerevisiae" @default.
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• W4281476278 doi "https://doi.org/10.1016/j.ymben.2022.05.007" @default.
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