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7-fold higher than that derived from the optimal reported σ70-dependent promoter P LlacO1. Biofuel production reaching levels 1.3- to 3.4-fold higher than those of the σ70-dependent promoters was also achieved by argTp and glnAp2 under stressed conditions. Moreover, the σ54-dependent promoters realized more rapid and stable production than that of σ70-dependent promoters during fed-batch fermentation, producing up to 4.78 g L - 1 of total biofuels. Conclusions These results suggested that the nitrogen-responsive transcriptional machine