Construction of recombinant Escherichia coli strains for production of poly-(3-hydroxybutyrate-co-3-hydroxyvalerate)

Kin Ho Law, Pui Ling Chan, Wai Sum Lau, Yin Chung Cheng, Yun Chung Leung, Wai Hung Lo, Hugh Lawford, Hoi Fu Yu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


Plastic wastes constitute a worldwide environmental problem, and the demand for biodegradable plastics has become high. One of the most important characteristics of microbial polyesters is that they are thermoplastic with environmentally degradable properties. In this study, pUC19/PHA was cloned and transformed into three different Escherichia coli strains. Among the three strains that were successfully expressed in the production of polyhydroxyalkanoates (PHA), E. coli HMS174 had the highest yield in the production of poly-(3-hydroxybutyrate-co-3-hydroxyvalerate) (P[HB-HV]). The cell dry weight and PHA content of recombinant HMS174 reached as high as 10.27 g/L and 43% (w/w), respectively, in fed-batch fermentor culture. The copolymer of PHA, P(HB-HV), was found in the cells, and the biopolymers accumulated were identified and analyzed by gas chroma tography, proton nuclear magnetic resonance spectroscopy, and differential scanning calorimetry. We demonstrated clearly that the E. coli host for PHA production has to be carefully selected to obtain a high yield. The results obtained indicated that a superior E. coli with high PHA production can be constructed with a desirable ratio of P(HB-HV), which has potential applications in industry and medicine.
Original languageEnglish
Pages (from-to)361-372
Number of pages12
JournalApplied Biochemistry and Biotechnology - Part A Enzyme Engineering and Biotechnology
Issue number1-3
Publication statusPublished - 1 Jan 2004


  • Differential scanning calorimetry
  • Escherichia coli
  • Fed-batch fermentation
  • Nuclear magnetic resonance
  • Polyhydroxyalkanoates

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biochemistry
  • Applied Microbiology and Biotechnology
  • Molecular Biology


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