title: Production of 1,3-propanediol from glycerol by recombinant E. coli using incompatible plasmids system.
abstract: 1,3-Propanediol (1,3-PD) has numerous applications in polymers, cosmetics, foods, lubricants, and medicines as a bifunctional organic compound. The genes for the production of 1,3-PD in Klebsiella pneumoniae, dhaB, which encodes glycerol dehydratase, and dhaT, which encodes 1,3-PD oxidoreductase, and gdrAB, which encodes glycerol dehydratase reactivating factor, are naturally under the control of different promoters and are transcribed in different directions. These genes were coexpressed in E. coli using two incompatible plasmids (pET28a and pET22b) in the presence of selective pressure. The recombinant E. coli coexpressed the glycerol dehydratase, 1,3-propanediol oxidoreductase and reactivating factor for the glycerol dehydratase at high levels. In a fed-batch fermentation of glycerol and glucose, the recombinant E. coli containing these two incompatible plasmids consumed 14.3 g/l glycerol and produced 8.6 g/l 1,3-propanediol. In the substitution case of yqhD (encoding alcohol dehydrogenase from E. coli) for dhaT, the final 1,3-propanediol concentration of the recombinant E. coli could reach 13.2 g/l.
authors.affiliation: Beijing Key Lab of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China.
authors.forename: Fenghuan
authors.initials: F
authors.lastname: Wang
authors.forename: Huijin
authors.initials: H
authors.lastname: Qu
authors.forename: Dawei
authors.initials: D
authors.lastname: Zhang
authors.forename: Pingfang
authors.initials: P
authors.lastname: Tian
authors.forename: Tianwei
authors.initials: T
authors.lastname: Tan
mesh_terms: D000667:Ampicillin / Q000494:pharmacology; D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics* / Q000378:metabolism*; D005990:Glycerol / Q000378:metabolism*; D006836:Hydro-Lyases / Q000235:genetics / Q000378:metabolism; D007612:Kanamycin / Q000494:pharmacology; D010957:Plasmids / Q000235:genetics*; D011409:Propylene Glycols / Q000378:metabolism*; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D014169:Transformation, Bacterial
chemical_list: D011409:Propylene Glycols; D011994:Recombinant Proteins; D007612:Kanamycin; C041787:1,3-propanediol; D000667:Ampicillin; D006836:Hydro-Lyases; D005990:Glycerol