Abstract
Naturally degradable bioplastic polyhydroxyalkanoate (PHA) is a promising biopolymer and its physical properties could be changed by introducing of different monomers such as 3-hydroxybutyrate (3HB), 3-hydroxyvalerate (3HV), and 3-hydroxyhexanoate (3HHx). To produce poly(3-hydroxybutyrate-co-3-hydroxyvalerate) P(3HB-co-3HV)) including a high fraction of hydroxyvalerate, we introduced ctfAB into engineered Escherichia coli YJ200 possessing a pLW487 vector containing bktB, phaB, and phaC under control of the trc promoter. To enhance the HV fraction of P(3HB-co-3HV), the optimal concentrations of propionate, which acts as a precursor of 3HV and isopropyl β-D-1-thiogalactopyranoside, were determined and found to be 0.1 mM and 0.3%, respectively. Under the optimized conditions, E. coli, YJ201 produced P(3HB-co-3HV) containing a large amount of 3HV. Comparison with other CoA transferases showed that CtfAB produced relatively lower molecular weight copolymers. This demonstrates the necessity of identifying additional different CoA transferases, because CoA transferase can affect both the monomer fraction and molecular weight of polymers.
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Acknowledgments
This work was supported by Research Program to solve social issues of the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (2017M3A9E4077234) and National Research Foundation of Korea (NRF) (NRF-2017R1D1A1B03033594, NRF- 2019M3E6A1103979 and NRF-2019R1F1A1058805). In addition, this work was also supported by the polar academic program (PAP, PE18900). This paper was also supported by Konkuk University Researcher Fund in 2019.
The authors declare no conflict of interest.
Neither ethical approval nor informed consent was required for this study.
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Choi, TR., Jeon, JM., Bhatia, S.K. et al. Production of Low Molecular Weight P(3HB-co-3HV) by Butyrateacetoacetate CoA-transferase (cftAB) in Escherichia coli. Biotechnol Bioproc E 25, 279–286 (2020). https://doi.org/10.1007/s12257-019-0366-1
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DOI: https://doi.org/10.1007/s12257-019-0366-1