title: 1,3-Propanediol production by new recombinant Escherichia coli containing genes from pathogenic bacteria.
abstract: 1,3-Propanediol (1,3-PDO) is an organic compound, which is a valuable intermediate product, widely used as a monomer for synthesizing biodegradable polymers, increasing their strength; as well as an ingredient of textile, cosmetic and medical products. 1,3-PDO is mostly synthesized chemically. Global companies have developed technologies for 1,3-PDO synthesis from petroleum products such as acrolein and ethylene oxide. A potentially viable alternative is offered by biotechnological processes using microorganisms capable of synthesizing 1,3-PDO from renewable substrates (waste glycerol, a by-product of biofuel production, or glucose). In the present study, genes from Citrobacter freundii and Klebsiella pneumoniae were introduced into Escherichia coli bacteria to enable the synthesis of 1,3-PDO from waste glycerol. These strains belong to the best 1,3-PDO producers, but they are pathogenic, which restricts their application in industrial processes. The present study involved the construction of two gene expression constructs, containing a total of six heterologous glycerol catabolism pathway genes from C. freundii ATCC 8090 and K. pneumoniae ATCC 700721. Heterologous genes encoding glycerol dehydratase (dhaBCE) and the glycerol dehydratase reactivation factor (dhaF, dhaG) from C. freundii and gene encoding 1,3-PDO oxidoreductase (dhaT) from K. pneumoniae were expressed in E. coli under the control of the T7lac promoter. An RT-PCR analysis and overexpression confirmed that 1,3-PDO synthesis pathway genes were expressed on the RNA and protein levels. In batch fermentation, recombinant E. coli bacteria used 32.6gl(-1) of glycerol to produce 10.6 gl(-1) of 1,3-PDO, attaining the efficiency of 0.4 (mol₁,₃-PDO molglycerol(-1)). The recombinant E. coli created is capable of metabolizing glycerol to produce 1,3-PDO, and the efficiency achieved provides a significant research potential of the bacterium. In the face of shortage of fossil fuel supplies and climate warming there is an increasing industrial need to exchange the chemical way of chemicals synthesis for biotechnological - more ecological manner. The 1,3-PDO production from glycerol is an desirable alternative to the traditional production from non-renewable resources. This work is a part of project, which opens a way to development of innovative "green chemistry" and new perspectives to chemical industry.
authors: Poznań University of Life Sciences, Department of Biochemistry and Biotechnology, Dojazd 11, 60-632 Poznań, Poland. Electronic address: hanna.przystalowska@wp.pl.
authors: Hanna
authors: H
authors: Przystałowska
authors: Poznań University of Life Sciences, Department of Biochemistry and Biotechnology, Dojazd 11, 60-632 Poznań, Poland.
authors: Joanna
authors: J
authors: Zeyland
authors: Poznań University of Life Sciences, Department of Biotechnology and Food Microbiology, Wojska Polskiego 48, 60-627 Poznań, Poland.
authors: Daria
authors: D
authors: Szymanowska-Powałowska
authors: Poznań University of Life Sciences, Department of Biochemistry and Biotechnology, Dojazd 11, 60-632 Poznań, Poland; Polish Academy of Sciences, Institute of Human Genetics, Strzeszyńska 32, 60-479 Poznań, Poland.
authors: Marlena
authors: M
authors: Szalata
authors: Poznań University of Life Sciences, Department of Biochemistry and Biotechnology, Dojazd 11, 60-632 Poznań, Poland; Polish Academy of Sciences, Institute of Human Genetics, Strzeszyńska 32, 60-479 Poznań, Poland.
authors: Ryszard
authors: R
authors: Słomski
authors: Poznań University of Life Sciences, Department of Biochemistry and Biotechnology, Dojazd 11, 60-632 Poznań, Poland; Polish Academy of Sciences, Institute of Human Genetics, Strzeszyńska 32, 60-479 Poznań, Poland.
authors: Daniel
authors: D
authors: Lipiński
mesh_terms: D019149:Bioreactors; D002384:Catalysis; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism*; D005285:Fermentation; D015870:Gene Expression; D005798:Genes, Bacterial; D006836:Hydro-Lyases / Q000235:genetics / Q000378:metabolism; D053858:Metabolic Networks and Pathways; D010957:Plasmids / Q000235:genetics; D011409:Propylene Glycols / Q000378:metabolism*; D011994:Recombinant Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D011409:Propylene Glycols; D011994:Recombinant Proteins; C041787:1,3-propanediol; D006836:Hydro-Lyases; C020671:glycerol dehydratase
keywords: 1,3-Propanediol; Citrobacter freundii; Genetically modified E. coli; Glycerol metabolic pathway; Klebsiella pneumoniae