Furfural is a major toxic byproduct found in the hydrolysate of lignocellulosic biomass, which adversely interferes with the growth and ethanol fermentation of . The current study was focused on the impact of cofactor availability derived intracellular redox perturbation on furfural tolerance. Here, three strategies were employed in cofactor conversion in : (1) heterologous expression of NADH dehydrogenase () from which catalyzed the NADH to NAD and increased the cellular sensitivity to furfural, (2) overexpression of , and genes responsible for the interconversion of NADPH and NADP, which enhanced the furfural tolerance, (3) expression of NAD(P) transhydrogenase () and NAD kinase () which showed a little impact on furfural tolerance. Besides, a substantial redistribution of metabolic fluxes was also observed with the expression of cofactor-related genes. These results indicated that NADPH-based intracellular redox perturbation plays a key role in furfural tolerance, which suggested single-gene manipulation as an effective strategy for enhancing tolerance and subsequently achieving higher ethanol titer using lignocellulosic hydrolysate.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7324476 | PMC |
http://dx.doi.org/10.3389/fbioe.2020.00615 | DOI Listing |
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