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- W2903868653 abstract "ABSTRACT Plant biomass is an attractive source of renewable carbon for conversion to biofuels and bio-based chemicals. Conversion strategies often use a fraction of the total biomass, focusing on sugars from cellulose and hemicellulose. Strategies that use plant components such as plant-derived aromatics and amino acids have the potential to improve the efficiency of overall biomass conversion. Pseudomonas putida is a promising host for biomass conversion for its ability to metabolize a wide variety of organic compounds, including aromatics derived from lignin. P. putida was engineered to produce medium chain methyl ketones, which are promising diesel blendstocks and potential platform chemicals, from glucose and lignin-related aromatics, 4-hydroxybenzoate (4-HB) and protocatechuate (PCA). Unexpectedly, P. putida methyl ketone production was enhanced 2-to 5-fold compared to sugar controls when Arabidopsis thaliana hydrolysates derived from engineered plants that overproduce 4-HB and PCA, while E. coli production was lowered in these hydrolysates. This enhancement was more pronounced (~7-fold increase) with hydrolysates derived from non-engineered switchgrass ( Panicum virgatum L.) suggesting it did not arise from overproduction of 4-HB and PCA. Global proteomic analysis of the methyl ketone-producing P. putida suggested that plant-derived amino acids may be the source of this enhancement. Mass spectrometry-based measurements of plant-derived amino acids demonstrated a high correlation between methyl ketone production and amino acid concentration in plant hydrolysates. Amendment of glucose-containing minimal media with a defined mixture of amino acids similar to those found in the hydrolysates studied led to a 9-fold increase in methyl ketone titer (1.1 g/L)." @default.
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- W2903868653 date "2018-12-13" @default.
- W2903868653 modified "2023-09-24" @default.
- W2903868653 title "Methyl ketone production by Pseudomonas putida is enhanced by plant-derived amino acids" @default.
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- W2903868653 doi "https://doi.org/10.1101/496497" @default.
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