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Corynebacterium Cell Factory Design and Culture Process Optimization for Muconic Acid Biosynthesis
Muconic acid (MA) is a valuable compound for adipic acid production, which is a precursor for the synthesis of various polymers such as plastics, coatings, and nylons. Although MA biosynthesis has been previously reported in several bacteria, the engineered strains were not satisfactory owing to low...
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Published in: | Scientific reports 2018-12, Vol.8 (1), p.18041-12, Article 18041 |
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Main Authors: | , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Muconic acid (MA) is a valuable compound for adipic acid production, which is a precursor for the synthesis of various polymers such as plastics, coatings, and nylons. Although MA biosynthesis has been previously reported in several bacteria, the engineered strains were not satisfactory owing to low MA titers. Here, we generated an engineered
Corynebacterium
cell factory to produce a high titer of MA through 3-dehydroshikimate (DHS) conversion to MA, with heterologous expression of foreign protocatechuate (PCA) decarboxylase genes. To accumulate key intermediates in the MA biosynthetic pathway,
aroE
(shikimate dehydrogenase gene),
pcaG/H
(PCA dioxygenase alpha/beta subunit genes) and
catB
(chloromuconate cycloisomerase gene) were disrupted. To accomplish the conversion of PCA to catechol (CA), a step that is absent in
Corynebacterium
, a codon-optimized heterologous PCA decarboxylase gene was expressed as a single operon under the strong promoter in a
aroE-pcaG/H-catB
triple knock-out
Corynebacterium
strain. This redesigned
Corynebacterium
, grown in an optimized medium, produced about 38 g/L MA and 54 g/L MA in 7-L and 50-L fed-batch fermentations, respectively. These results show highest levels of MA production demonstrated in
Corynebacterium
, suggesting that the rational cell factory design of MA biosynthesis could be an alternative way to complement petrochemical-based chemical processes. |
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ISSN: | 2045-2322 2045-2322 |
DOI: | 10.1038/s41598-018-36320-4 |