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Microb Biotechnol. 2017 Nov;10(6):1353-1364. doi: 10.1111/1751-7915.12721. Epub 2017 Apr 19.

Engineering the xylose-catabolizing Dahms pathway for production of poly(d-lactate-co-glycolate) and poly(d-lactate-co-glycolate-co-d-2-hydroxybutyrate) in Escherichia coli.

Author information

1
Metabolic and Biomolecular Engineering National Research Laboratory, Department of Chemical and Biomolecular Engineering (BK21 Plus Program), BioProcess Engineering Research Center, and KAIST Institute (KI) for the BioCentury, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Korea.
2
Department of Chemical and Biomolecular Engineering (BK21 Plus Program), KAIST, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Korea.
3
Department of Chemical Engineering and Materials Science, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul, 03760, Korea.

Abstract

Poly(lactate-co-glycolate), PLGA, is a representative synthetic biopolymer widely used in medical applications. Recently, we reported one-step direct fermentative production of PLGA and its copolymers by metabolically engineered Escherichia coli from xylose and glucose. In this study, we report development of metabolically engineered E. coli strains for the production of PLGA and poly(d-lactate-co-glycolate-co-d-2-hydroxybutyrate) having various monomer compositions from xylose as a sole carbon source. To achieve this, the metabolic flux towards Dahms pathway was modulated using five different synthetic promoters for the expression of Caulobacter crescentus XylBC. Further metabolic engineering to concentrate the metabolic flux towards d-lactate and glycolate resulted in production of PLGA and poly(d-lactate-co-glycolate-co-d-2-hydroxybutyrate) with various monomer fractions from xylose. The engineered E. coli strains produced polymers containing 8.8-60.9 mol% of glycolate up to 6.93 g l-1 by fed-batch cultivation in a chemically defined medium containing xylose. Finally, the biocompatibility of poly(d-lactate-co-glycolate-co-d-2-hydroxybutyrate) was confirmed by live/dead assay using human mesenchymal stem cells.

PMID:
28425205
PMCID:
PMC5658605
DOI:
10.1111/1751-7915.12721
[Indexed for MEDLINE]
Free PMC Article

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