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Recombinant Escherichia coli BLR(DE3) harboring the hemA gene from Rhodobacter capsulatus under the control of a constitutive promoter, which we constructed previously, was used for the extracellular production of 5-aminolevulinic acid (ALA). The effects of several factors on ALA production were investigated in flask culture. ALA production by the recombinant E. coli was more efficient at 30℃ than 37℃. The glycine concentration had an important effect on cell growth. Glycine and succinic acid concentration of 5-10 and 10-20 g/L, respectively, resulted in high ALA production. In addition, the partial replacement of succinic acid by sodium glutamate increased the ALA production. The ALA production was inhibited by the presence of glucose in the medium. Using the optimal conditions, an ALA concentration of 8.2 g/L was achieved in jar fermentation without an added inducer or ALA dehydratase inhibitor; this is the highest reported concentration.

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