title: [Effects of knockout of 2,3-butanediol synthesis key enzyme genes on 1,3-propandediol production in Klebsiella pneumoniae].
abstract: 2,3-butanediol (2,3-BD) is a major byproduct of 1,3-propandediol (1,3-PDO) fermentation by Klebsiella pneumoniae. To decrease the formation of 2,3-BD, the budC and budA gene, coding two key enzymes of 2,3-BD synthetic pathway in K. pneumoniae, were knocked out using Red recombination technology. The growth of the two mutants were suppressed in different level. The budC deficient strain fermentation results showed that 1,3-PDO concentration increased to 110% and 2,3-butanediol concentration dropped to 70% of the parent strain. However, the budA deficient strain did not produce 1,3-PDO and 2,3-BD, and the final titer of lactic acid, succinic acid, ethanol and acetic acid increased remarkably compared with the parent strain. Further analysis of budC deficient strain fermentation inferred that K. pneumoniae possessed the 2,3-BD cycle as a replenishment pathway. The consequence provided a new evidence for reforming low-byproduct K. pneumoniae.
authors.affiliation: Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, Jiangsu, China.
authors.forename: Xinkun
authors.initials: X
authors.lastname: Guo
authors.affiliation: Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, Jiangsu, China.
authors.forename: Huiying
authors.initials: H
authors.lastname: Fang
authors.affiliation: Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, Jiangsu, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Zhuge
authors.affiliation: Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, Jiangsu, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Zong
authors.affiliation: Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, Jiangsu, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Song
authors.affiliation: Key Laboratory of Industrial Biotechnology, Ministry of Education, Jiangnan University, Wuxi 214122, Jiangsu, China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhuge
mesh_terms: D000095:Acetolactate Synthase / Q000235:genetics / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics; D002072:Butylene Glycols / Q000378:metabolism*; D002262:Carboxy-Lyases / Q000235:genetics*; D055786:Gene Knockout Techniques; D005990:Glycerol / Q000378:metabolism; D007711:Klebsiella pneumoniae / Q000235:genetics* / Q000378:metabolism; D009154:Mutation; D011409:Propylene Glycols / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D002072:Butylene Glycols; D011409:Propylene Glycols; C026978:2,3-butylene glycol; C041787:1,3-propanediol; D000095:Acetolactate Synthase; D002262:Carboxy-Lyases; C023746:acetolactate decarboxylase; D005990:Glycerol