Metabolic engineering of Clostridium acetobutylicum for the industrial production of 1,3-propanediol from glycerol

María González-Pajuelo, Isabelle Meynial-Salles, Filipa Mendes, Jose Carlos Andrade, Isabel Vasconcelos, Philippe Soucaille*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

164 Citations (Scopus)
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Abstract

Clostridium butyricum is to our knowledge the best natural 1,3-propanediol producer from glycerol and the only microorganism identified so far to use a coenzyme B12-independent glycerol dehydratase. However, to develop an economical process of 1,3-propanediol production, it would be necessary to improve the strain by a metabolic engineering approach. Unfortunately, no genetic tools are currently available for C. butyricum and all our efforts to develop them have been so far unsuccessful. To obtain a better "vitamin B12-free" biological process, we developed a metabolic engineering strategy with Clostridium acetobutylicum. The 1,3-propanediol pathway from C. butyricum was introduced on a plasmid in several mutants of C. acetobutylicum altered in product formation. The DG1(pSPD5) recombinant strain was the most efficient strain and was further characterized from a physiological and biotechnological point of view. Chemostat cultures of this strain grown on glucose alone produced only acids (acetate, butyrate and lactate) and a high level of hydrogen. In contrast, when glycerol was metabolized in chemostat culture, 1,3-propanediol became the major product, the specific rate of acid formation decreased and a very low level of hydrogen was observed. In a fed-batch culture, the DG1(pSPD5) strain was able to produce 1,3-propanediol at a higher concentration (1104 mM) and productivity than the natural producer C. butyricum VPI 3266. Furthermore, this strain was also successfully used for very long term continuous production of 1,3-propanediol at high volumetric productivity (3 g L-1 h-1) and titer (788 mM).

Original languageEnglish
Pages (from-to)329-336
Number of pages8
JournalMetabolic Engineering
Volume7
Issue number5-6
DOIs
Publication statusPublished - Sep 2005

Keywords

  • 3-propanediol
  • Clostridium acetobutylicum
  • Glycerol
  • Metabolic engineering
  • Vitamin B-free biological process

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