Abstract
Cupriavidus necator is well known for its ability to accumulate polyhydroxybutyrate (PHB). When supplemented with propionic acid (or sodium propionate) in the growth medium, the bacterium is also able to synthesize polyhydroxybutyrate-co-hydroxyvalerate (PHBV). In order to increase the fraction of 3-hydroxyvalerate (3HV) in PHBV, we cloned the propionate permease gene prpP from C. necator and the propionyl-CoA synthase gene prpE from Cupriavidus taiwanensis and transformed into an Escherichia coli containing phaCAB operon of C. necator. The effects on PHBV accumulation in cells co-expressed with phaCAB and prpE or prpP in the media contained mixed carbon sources (glucose and sodium propionate) were evaluated. The HV fraction in PHBV increased when prpE or prpP was overexpressed in the cells. Concentrations of yeast extracts could also affect the fraction of HV. In addition, when glucose was replaced by sodium pyruvate, sodium succinate, or sodium gluconate, only PHB were detected in the recombinant strains.
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This work was partially supported by grants (contract number NSC100-2221-E-155-002, NSC99-2628-E-155-002 and NSC98-2622-E-155-003-CC2) from National Science Council, Taiwan.
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Chien, CC., Li, HH., Soo, PC. et al. Effects of Different Substrate Composition on Biosynthesis of Polyhydroxybutyrate-co-hydroxyvalerate by Recombinant Escherichia coli . Appl Biochem Biotechnol 166, 796–804 (2012). https://doi.org/10.1007/s12010-011-9469-7
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DOI: https://doi.org/10.1007/s12010-011-9469-7