Applied Biochemistry and Biotechnology

, Volume 170, Issue 6, pp 1503–1524 | Cite as

Synthetic 2,3-Butanediol Pathway Integrated Using Tn7-tool and Powered Via Elimination of Sporulation and Acetate Production in Acetogen Biocatalyst

Article

Abstract

Acetogen Clostridium sp. MT1802 originally producing 336-mM acetate from inorganic carbon of CO2/CO was engineered to eliminate acetate production and sporulation using Cre-lox66/lox71-approach. The recombinant started producing 105-mM formate expressing synthetic formate dehydrogenase integrated in two copies. Formate-producing recombinant was further engineered to express synthetic formate acetyltransferase, acetolactate synthase, acetolactate decarboxylase, and alcohol dehydrogenase integrated in two copies each using Tn7 tool. The resulted recombinant started producing 102-mM 2,3-butanediol (23BD). 23BD production was confirmed in five independent single step fermentation runs 25 days long each in five repeats using syngas blend 60 % CO and 40 % H2 (v/v) (p <0.005). 23BD production was 78 % if only CO2/H2 blend was fed instead of syngas (p <0.005). 23BD from CO2/H2 blend might serve as a commercial route to mitigate global warming in proportion to CO2 fermentation scale worldwide.

Keywords

Acetogens Formate 2,3-butanediol CO2 Fermentation Tn7-based Gene Integration 

Notes

Acknowledgments

The research was supported by the funds of angel friends of MT family. Syngas Biofuels Energy, Inc. and its successors are the sole distributors of the electroporation and electrofusion equipment: www.syngasbiofuelsenergy.com.

Conflict of Interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.Syngas Biofuels Energy, Inc.HoustonUSA
  2. 2.Ajinomoto-Genetika Research InstituteMoscowRussia

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