The pretreatment of lignocellulosic biomass with acid generates phenolic and furanyl compounds that function as toxins by inhibiting microbial growth and metabolism.Therefore,it is necessary to detoxify acid-pretreate...The pretreatment of lignocellulosic biomass with acid generates phenolic and furanyl compounds that function as toxins by inhibiting microbial growth and metabolism.Therefore,it is necessary to detoxify acid-pretreated lignocellulosic biomass for better utilization.Among the various detoxification methods that are available,biodetoxification offers advantages that include mild reaction conditions and low energy consumption.In this study,a newly isolated Rhodococcus aetherivorans strain,N1,was found to effectively degrade various lignin-derived aromatic compounds,such as p-coumarate,ferulate,syringaldehyde,furfural,and 5-hydroxymethylfurfural.Furthermore,the metabolic pathway and genes responsible for this degradation were also identified.In addition,the overexpression of a demethylase(DesA)and 3,4-dioxygenase(DesZ)in strain N1 generated a recombinant strain,N1-S,which showed an enhanced ability to degrade syringaldehyde and 80.5%furfural,50.7%5-hydroxymethylfurfural,and 71.5%phenolic compounds in corn cob hydrolysate.The resulting detoxified hydrolysate was used directly as a feedstock for succinate production by Escherichia coli suc260.This afforded 35.3 g/l succinate,which was 6.5 times greater than the concentration afforded when nondetoxified hydrolysate was used.Overall,the results of this study demonstrate that strain N1-S is a valuable microbe for the biodetoxification of lignocellulosic biomass.展开更多
基金supported by the National Key R&D Program of China(2023YFC3403502)the National Natural Science Foundation of China(22178169 and 22008113)+2 种基金the Jiangsu Province Natural Science Foundation for Jiangsu for Distinguished Young Scholars(BK20220052)the China Postdoctoral Science Foundation(2022M711605)the Jiangsu Synergetic Innovation Center for Advanced Biomanufacturing(XTD2215).
文摘The pretreatment of lignocellulosic biomass with acid generates phenolic and furanyl compounds that function as toxins by inhibiting microbial growth and metabolism.Therefore,it is necessary to detoxify acid-pretreated lignocellulosic biomass for better utilization.Among the various detoxification methods that are available,biodetoxification offers advantages that include mild reaction conditions and low energy consumption.In this study,a newly isolated Rhodococcus aetherivorans strain,N1,was found to effectively degrade various lignin-derived aromatic compounds,such as p-coumarate,ferulate,syringaldehyde,furfural,and 5-hydroxymethylfurfural.Furthermore,the metabolic pathway and genes responsible for this degradation were also identified.In addition,the overexpression of a demethylase(DesA)and 3,4-dioxygenase(DesZ)in strain N1 generated a recombinant strain,N1-S,which showed an enhanced ability to degrade syringaldehyde and 80.5%furfural,50.7%5-hydroxymethylfurfural,and 71.5%phenolic compounds in corn cob hydrolysate.The resulting detoxified hydrolysate was used directly as a feedstock for succinate production by Escherichia coli suc260.This afforded 35.3 g/l succinate,which was 6.5 times greater than the concentration afforded when nondetoxified hydrolysate was used.Overall,the results of this study demonstrate that strain N1-S is a valuable microbe for the biodetoxification of lignocellulosic biomass.
