Optimization of extracellular 5-aminolevulinic acid production from Escherichia coli transformed with ALA synthase gene of Bradyrhizobium japonicum |
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Authors: | Chan Choi Bum-Sik Hong Ha-Chin Sung Heung-Sik Lee Jae-Ho Kim |
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Institution: | (1) Graduate School of Biotechnology, Korea University, Anam-dong, Sungbuk-ku, Seoul, 136-701, Korea |
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Abstract: | Extracellular accumulation of 5-aminolevulinic acid (ALA) by an E. coli overexpressing ALA synthase (ALAS) was achieved by inserting a hemA gene from Bradyrhizobium japonicum and expressed under the control of T7 promoter. At pH 7.0 extracellular ALA reached up to 15 mM in a jar fermenter with an addition of glycine (30 mM) and succinate (90 mM) in the medium. ALA accumulation was increased to 20 mM by adding levulinic acid (30 mM) to the cultures. |
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Keywords: | ALA synthase Bradirhyzobium japonicum Escherichia coli 5-aminolevulinic acid over-expression |
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