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- W2759832015 abstract "Microorganisms can catabolize a wide range of organic compounds and therefore have the potential to perform many industrially relevant bioconversions. One barrier to realizing the potential of biorefining strategies lies in our incomplete knowledge of metabolic pathways, including those that can be used to assimilate naturally abundant or easily generated feedstocks. For instance, levulinic acid (LA) is a carbon source that is readily obtainable as a dehydration product of lignocellulosic biomass and can serve as the sole carbon source for some bacteria. Yet, the genetics and structure of LA catabolism have remained unknown. Here, we report the identification and characterization of a seven-gene operon that enables LA catabolism in Pseudomonas putida KT2440. When the pathway was reconstituted with purified proteins, we observed the formation of four acyl-CoA intermediates, including a unique 4-phosphovaleryl-CoA and the previously observed 3-hydroxyvaleryl-CoA product. Using adaptive evolution, we obtained a mutant of Escherichia coli LS5218 with functional deletions of fadE and atoC that was capable of robust growth on LA when it expressed the five enzymes from the P. putida operon. This discovery will enable more efficient use of biomass hydrolysates and metabolic engineering to develop bioconversions using LA as a feedstock. Levulinic acid (LA) is a value-added chemical easily obtained from biomass. The pathway enabling LA degradation in Pseudomonas putida requires five enzymes and can be engineered into Escherichia coli, which could enable further biotechnological applications." @default.
- W2759832015 created "2017-10-06" @default.
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- W2759832015 date "2017-09-25" @default.
- W2759832015 modified "2023-10-16" @default.
- W2759832015 title "A metabolic pathway for catabolizing levulinic acid in bacteria" @default.
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- W2759832015 doi "https://doi.org/10.1038/s41564-017-0028-z" @default.
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