Biosynthesis of polyhydroxyalkanoates from sucrose by metabolically engineered Escherichia coli strains

Yu Jung Sohn, Hee Taek Kim, Kei Anne Baritugo, Hye Min Song, Mi Hee Ryu, Kyoung Hee Kang, Seo Young Jo, Hoyong Kim, You Jin Kim, Jong il Choi, Su Kyeong Park, Jeong Chan Joo, Si Jae Park

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Sucrose utilization has been established in Escherichia coli strains by expression of Mannheimia succiniciproducens β-fructofuranosidase (SacC), which hydrolyzes sucrose into glucose and fructose. Recombinant E. coli strains that can utilize sucrose were examined for their abilities to produce poly(3-hydroxybutyrate) [P(3HB)] and poly(3-hydroxybutyrate-co-lactate) [P(3HB-co-LA)] from sucrose. When recombinant E. coli strains expressing Ralstonia eutropha PhaCAB and SacC were cultured in MR medium containing 20 g/L of sucrose, all recombinant E. coli strains could produce P(3HB) from sucrose. Also, recombinant E. coli strains expressing Pseudomonas sp. MBEL 6-19 PhaC1437, Clostridium propionicum Pct540, R. eutropha PhaAB enzymes along with SacC could produce P(3HB-co-LA) from sucrose. Among the examined E. coli strains, recombinant E. coli XL1-Blue produced the highest contents of P(3HB) (53.60 ± 2.55 wt%) and P(3HB-co-LA) (29.44 ± 0.39 wt%). In the batch fermentations, recombinant E. coli XL1-Blue strains completely consumed 20 g/L of sucrose as the sole carbon source and supported the production of 3.76 g/L of P(3HB) and 1.82 g/L of P(3HB-co-LA) with 38.21 wt% P(3HB) and 20.88 wt% P(3HB-co-LA) contents, respectively. Recombinant E. coli strains developed in this study can be used to establish a cost-efficient biorefinery for the production of polyhydroxyalkanoates (PHAs) from sucrose, which is an abundant and inexpensive carbon source.

Original languageEnglish
Pages (from-to)593-599
Number of pages7
JournalInternational Journal of Biological Macromolecules
Volume149
DOIs
StatePublished - 15 Apr 2020

Keywords

  • Escherichia coli
  • Polyhydroxyalkanoates
  • Sucrose

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