Abstract
To improve the hydrogen productivity and examine the hydrogen evolution mechanism of Clostridium paraputrificum, roles of formate in hydrogen evolution and effects of introducing formate-originated NADH regeneration were explored. The formate-decomposing pathway for hydrogen production was verified to exist in C. paraputrificum. Then NAD+-dependent formate dehydrogenase FDH1 gene (fdh1) from Candida boidinii was overexpressed, which regenerate more NADH from formate to form hydrogen by NADH-mediated pathway. With fdh1 overexpression, the hydrogen yield via NADH-involving pathway increased by at least 59 % compared with the control. Accompanied by the change of hydrogen metabolism, the whole cellular metabolism was redistributed greatly.
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Acknowledgment
The authors thank Prof. B. Witholt of ETH of Switzerland for kindly donating the plasmid pCom10, and Prof. K. Ohmiya of Mie University of Japan for gifting with C. paraputrificum. This work was supported by the National Basic Research Program of China (973 Plan) (grant no. 2009CB724702 and 2011CB707404) and National Natural Science Foundation of China (no. 20806046 and 20836004).
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Lu, Y., Zhang, C., Zhao, H. et al. Improvement of Hydrogen Productivity by Introduction of NADH Regeneration Pathway in Clostridium paraputrificum . Appl Biochem Biotechnol 167, 732–742 (2012). https://doi.org/10.1007/s12010-012-9703-y
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DOI: https://doi.org/10.1007/s12010-012-9703-y