Abstract
Corynebacterium glutamicum wild type lacks the ability to utilize the xylose fractions of lignocellulosic hydrolysates. In the present work, we constructed a xylose metabolic pathway in C. glutamicum by heterologous expression of the xylA and xylB genes coming from Escherichia coli. Dilute-acid hydrolysates of corn cobs containing xylose and glucose were used as a substrate for succinic acid production by recombinant C. glutamicum NC-2. The results indicated that the available activated charcoal pretreatment in dilute-acid hydrolysates of corn cobs could be able to overcome the inhibitory effect in succinic acid production. Succinic acid was shown to be efficiently produced from corn cob hydrolysates (55 g l−1 xylose and 4 g l−1 glucose) under oxygen deprivation with addition of sodium carbonate. Succinic acid concentration reached 40.8 g l−1 with a yield of 0.69 g g−1 total sugars within 48 h. It was the first report of succinic acid production from corn cob hydrolysates by metabolically engineered C. glutamicum. This study suggested that dilute-acid hydrolysates of corn cobs may be an alternative substrate for the efficient production of succinic acid by C. glutamicum.
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Acknowledgments
We are grateful to Professor Min Jiang at Nanjing University of Technology, China, for providing strains of C. glutamicum ATCC 13032. This work was financially supported by the National Key Basic Research and Development Program of China (no. 2011CBA00807).
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Chen Wang and Hengli Zhang contributed equally to this work.
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Wang, C., Zhang, H., Cai, H. et al. Succinic Acid Production from Corn Cob Hydrolysates by Genetically Engineered Corynebacterium glutamicum . Appl Biochem Biotechnol 172, 340–350 (2014). https://doi.org/10.1007/s12010-013-0539-x
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DOI: https://doi.org/10.1007/s12010-013-0539-x