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Cited by 294

The DOI matches its Crossref record; 36 of the 36 references it cites were found in a registry or an index.

Metabolic engineering of Escherichia coli for the production of polylactic acid and its copolymers

Jung, Yu Kyung, Kim, Tae Yong, Park, Si Jae, Lee, Sang Yup·2010·Biotechnology and Bioengineering
DOI 10.1002/bit.22548
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Abstract

Polylactic acid (PLA) is a promising biomass‐derived polymer, but is currently synthesized by a two‐step process: fermentative production of lactic acid followed by chemical polymerization. Here we report production of PLA homopolymer and its copolymer, poly(3‐hydroxybutyrate‐co‐lactate), P(3HB‐co‐LA), by direct fermentation of metabolically engineered Escherichia coli. As shown in an accompanying paper, introduction of the heterologous metabolic pathways involving engineered propionate CoA‐transferase and polyhydroxyalkanoate (PHA) synthase for the efficient generation of lactyl‐CoA and incorporation of lactyl‐CoA into the polymer, respectively, allowed synthesis of PLA and P(3HB‐co‐LA) in E. coli, but at relatively low efficiency. In this study, the metabolic pathways of E. coli were further engineered by knocking out the ackA, ppc, and adhE genes and by replacing the promoters of the ldhA and acs genes with the trc promoter based on in silico genome‐scale metabolic flux analysis in addition to rational approach. Using this engineered strain, PLA homopolymer could be produced up to 11 wt% from glucose. Also, P(3HB‐co‐LA) copolymers containing 55–86 mol% lactate could be produced up to 56 wt% from glucose and 3HB. P(3HB‐co‐LA) copolymers containing up to 70 mol% lactate could be produced to 46 wt% from glucose alone by introducing the Cupriavidus necator β‐ketothiolase and acetoacetyl‐CoA reductase genes. Thus, the strategy of combined metabolic engineering and enzyme engineering allowed efficient bio‐based one‐step production of PLA and its copolymers. This strategy should be generally useful for developing other engineered organisms capable of producing various unnatural polymers by direct fermentation from renewable resources. Biotechnol. Bioeng. 2010; 105: 161–171. © 2009 Wiley Periodicals, Inc.

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Metadata

Authors
Jung, Y. K., Kim, T. Y., Park, S. J., & Lee, S. Y.
Venue
Biotechnology and Bioengineering
Publisher
Wiley
Published
2009-11-23
Volume
105
Issue
1
Pages
161-171
ISSN
  • 0006-3592 (ISSN-L)
  • 1097-0290
DOI
10.1002/bit.22548
OpenAlex
W2123794239
Cited by
294
References
36
FWCI
6.97
Type
journal article
Language
en
Open access
closed

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