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Inactivation of dhaD and dhaK abolishes by-product accumulation during 1,3-propanediol production in Klebsiella pneumoniae.
- Source :
-
Journal of Industrial Microbiology & Biotechnology . Jul2010, Vol. 37 Issue 7, p707-716. 10p. 1 Diagram, 4 Charts, 3 Graphs. - Publication Year :
- 2010
-
Abstract
- 1,3-Propanediol (1,3-PD) can be used for the industrial synthesis of a variety of compounds, including polyesters, polyethers, and polyurethanes. 1,3-PD is generated from petrochemical and microbial sources. 1,3-Propanediol is a typical product of glycerol fermentation, while acetate, lactate, 2,3-butanediol, and ethanol also accumulate during the process. Substrate and product inhibition limit the final concentration of 1,3-propanediol in the fermentation broth. It is impossible to increase the yield of 1,3-propanediol by using the traditional whole-cell fermentation process. In this study, dhaD and dhaK, the genes for glycerol dehydrogenase and dihydroxyacetone kinase, respectively, were inactivated by homologous recombination in Klebsiella pneumoniae. The dhaD/ dhaK double mutant (designated TC100), selected from 5,000 single or double cross homologous recombination mutants, was confirmed as a double cross by using polymerase chain reaction. Analysis of the cell-free supernatant with high-performance liquid chromatography revealed elimination of lactate and 2,3-butanediol, as well as ethanol accumulation in TC100, compared with the wild-type strain. Furthermore, 1,3-propanediol productivity was increased in the TC100 strain expressing glycerol dehydratase and 1,3-PDO dehydrogenase regulated by the arabinose PBAD promoter. The genetic engineering and medium formulation approaches used here should aid in the separation of 1,3-propanediol from lactate, 2,3-butanediol, and ethanol and lead to increased production of 1,3-propanediol in Klebsiella pneumoniae. [ABSTRACT FROM AUTHOR]
- Subjects :
- *KLEBSIELLA pneumoniae
*ENTEROBACTERIACEAE
*FERMENTATION
*CHROMATOGRAPHIC analysis
Subjects
Details
- Language :
- English
- ISSN :
- 13675435
- Volume :
- 37
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Journal of Industrial Microbiology & Biotechnology
- Publication Type :
- Academic Journal
- Accession number :
- 51411392
- Full Text :
- https://doi.org/10.1007/s10295-010-0714-9