Microbial production of 4-hydroxybutyrate, poly-4-hydroxybutyrate, and poly(3-hydroxybutyrate-co-4-hydroxybutyrate) by recombinant microorganisms.
4-Hydroxybutyrate (4HB) was produced by Aeromonas hydrophila 4AK4, Escherichia coli S17-1, or Pseudomonas putida KT2442 harboring 1,3-propanediol dehydrogenase gene dhaT and aldehyde dehydrogenase gene aldD from P. putida KT2442 which are capable of transforming 1,4-butanediol (1,4-BD) to 4HB. 4HB containing fermentation broth was used for production of homopolymer poly-4-hydroxybutyrate [P(4HB)] and copolymers poly(3-hydroxybutyrate-co-4-hydroxybutyrate) [P(3HB-4HB)]. Recombinant A. hydrophila 4AK4 harboring plasmid pZL-dhaT-aldD containing dhaT and aldD was the most effective 4HB producer, achieving approximately 4 g/l 4HB from 10 g/l 1,4-BD after 48 h of incubation. The strain produced over 10 g/l 4HB from 20 g/l 1,4-BD after 52 h of cultivation in a 6-L fermenter. Recombinant E. coli S17-1 grown on 4HB containing fermentation broth was found to accumulate 83 wt.% of intracellular P(4HB) in shake flask study. Recombinant Ralstonia eutropha H16 grew to over 6 g/l cell dry weight containing 49 wt.% P(3HB-13%4HB) after 72 h.
Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, China.
Lei
L
Zhang
Zhen-Yu
ZY
Shi
Qiong
Q
Wu
Guo-Qiang
GQ
Chen
D001419:Bacteria / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D018533:Biomass; D001711:Biotransformation; D005285:Fermentation; D005818:Genetic Engineering; D006885:Hydroxybutyrates / Q000737:chemistry / Q000378:metabolism*; D007218:Industrial Microbiology; D010957:Plasmids / Q000235:genetics / Q000378:metabolism; D011108:Polymers / Q000737:chemistry / Q000378:metabolism
D006885:Hydroxybutyrates; D011108:Polymers