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Bioprocess development for muconic acid production from aromatic compounds and lignin

Journal Article · · Green Chemistry
DOI:https://doi.org/10.1039/C8GC02519C· OSTI ID:1480230
Muconic acid (MA) is a bio-based platform chemical that can be converted into the commodity petrochemical building blocks adipic acid or terephthalic acid, or used in emerging, performance-advantaged materials. MA is a metabolic intermediate in the ß-ketoadipate pathway, and can be produced from carbohydrates or other traditional carbon sources via the shikimate pathway. MA can also be produced from lignin-derived aromatic compounds with high atom efficiency through aromatic-catabolic pathways. Metabolic engineering efforts to date have developed efficient muconic acid-producing strains of the aromatic-catabolic microbe Pseudomonas putida KT2440, but the titers, productivities, and yields from aromatic compounds in most cases remain below the thresholds needed for industrially-relevant bioreactor cultivations. To that end, this work presents further process and host development towards improving MA titers, yields, and productivities, using the hydroxycinnamic acids, pcoumaric acid and ferulic acid, as model aromatic compounds. Coupling strain engineering and bioprocess development enabled the discovery of new bottlenecks in P. putida that hinder MA production from these compounds. A combination of gene overexpression and removal of a global catabolic regulator resulted in highyielding strains (100% molar yield). Maximum MA titers of 50 g/L, which is near the lethal toxicity limit in this bacterium, and productivities over 0.5 g/L/h were achieved in separate process configurations. Additionally, a high-pH feeding strategy, which could potentially reduce the salt load and enable higher titers by decreasing product dilution, was tested with model compounds and lignin-rich streams from corn stover and a complete conversion of the primary monomeric aromatic compounds to MA was demonstrated, obtaining a titer of 4 g/L. Overall, this study presents a step forward for the production of value-added chemicals from lignin and highlights critical needs for further strain improvement and bioprocess development that can be applied in the biological valorization of lignin.
Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1480230
Alternate ID(s):
OSTI ID: 1477891
Report Number(s):
NREL/JA--2A00-72687
Journal Information:
Green Chemistry, Journal Name: Green Chemistry Journal Issue: 21 Vol. 20; ISSN GRCHFJ; ISSN 1463-9262
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (8)

Engineering electrochemical CO 2 reduction to formate under bioprocess‐compatible conditions to bioreactor scale journal July 2019
Isolation of a novel platform bacterium for lignin valorization and its application in glucose-free cis,cis-muconate production journal May 2019
Promoting microbial utilization of phenolic substrates from bio-oil journal July 2019
Muconic acid production from methane using rationally-engineered methanotrophic biocatalysts journal January 2019
Passive membrane transport of lignin-related compounds journal October 2019
Metabolic engineering of Pseudomonas putida for increased polyhydroxyalkanoate production from lignin journal January 2020
Recent advances in lignin valorization with bacterial cultures: microorganisms, metabolic pathways, and bio-products journal February 2019
Development of Rhodococcus opacus as a chassis for lignin valorization and bioproduction of high-value compounds journal August 2019

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