Journal
JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY
Volume 42, Issue 5, Pages 701-709Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10295-014-1581-6
Keywords
Muconic acid; 2,3-Dihydroxybenzoate; Enterobactin; Metabolic engineering; Escherichia coli
Categories
Funding
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- 111 Project [111-2-06]
- Jiangsu province Collaborative Innovation Center for Advanced Industrial Fermentation industry development program
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Muconic acid (MA) is a promising bulk chemical due to its extensive industrial applications in the production of adipic acid and other valuable, biodegradable intermediates. MA is heretofore mainly produced from petrochemicals by organic reactions which are not environmentally friendly or renewable. Biological production processes provide a promising alternative for MA production. We designed an artificial pathway in Escherichia coli for the biosynthesis of MA using the catechol group of 2,3-dihydroxybenzoate, an intermediate in the enterobactin biosynthesis pathway. This approach consists of two heterologous microbial enzymes, including 2,3-dihydroxybenzoate decarboxylase and catechol 1,2-dioxygenase. The metabolic flow of carbon into the heterologous pathway was optimized by increasing the flux from chorismate through the enterobactin biosynthesis pathway and by regulating the shikimate pathway. Metabolic optimization enabled a concentration of 605.18 mg/L of MA from glucose in a shaking flask culture, a value nearly 484-fold higher than that of the initial recombinant strain. The results indicated that the production of MA from this pathway has the potential for further improvement.
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