Proteomics

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Multiomic studies of inhibitory effects of lignocellulose-derived inhibitors on xylose utilization in Zymomonas mobilis using chemical defined synthetic hydrolysates


ABSTRACT: Previously we found that modified Zymomonas mobilis is able to convert glucose to ethanol when fermenting highly concentrated hydrolysates such as 9% glucan-loading AFEX-pretreated corn stover hydrolysate (ACSH), but that xylose conversion after glucose depletion is greatly impaired. We hypothesized that impaired xylose conversion is caused by lignocellulose-derived inhibitors (LDIs) present in highly concentrated hydrolysates. To investigate the effects of LDIs on xylose utilization in Z. mobilis, we generated synthetic hydrolysates (SynHs) that contains nutrients and LDI at concentrations found in authentic 9% ACSH. Comparative fermentations of Z. mobilis 2032 using SynH with or without LDI were performed, and samples were collected for endproduct, transcriptomic, metabolomic, and proteomic analyses. Our data suggest that the overall flux of xylose metabolism is reduced in the presence of LDIs. However, the expression of most genes involved in glucose and xylose assimilation was not affected by LDIs nor did we observe blocks in glucose and xylose metabolic pathways. Several LDI-specific effects were observed including intracellular accumulation of mannose-1P and mannose-6P, down regulation of a Type I secretion system (ZMO0252-0255), and upregulation of sulfur metabolism genes and the RND family efflux pump system (ZMO0282_0283_0285). This efflux pump system is involved in detoxification. Together, our findings identify cellular responses to LDIs and possible causes of impaired xylose conversion that will enable future strain engineering of Z. mobilis.

INSTRUMENT(S): Orbitrap Fusion Lumos

ORGANISM(S): Zymomonas Mobilis

SUBMITTER: Evgenia Shishkova  

LAB HEAD: Prof. Joshua J Coon

PROVIDER: PXD015007 | Pride | 2019-10-28

REPOSITORIES: Pride

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Publications

Multiomic Fermentation Using Chemically Defined Synthetic Hydrolyzates Revealed Multiple Effects of Lignocellulose-Derived Inhibitors on Cell Physiology and Xylose Utilization in <i>Zymomonas mobilis</i>.

Zhang Yaoping Y   Vera Jessica M JM   Xie Dan D   Serate Jose J   Pohlmann Edward E   Russell Jason D JD   Hebert Alexander S AS   Coon Joshua J JJ   Sato Trey K TK   Landick Robert R  

Frontiers in microbiology 20191107


Utilization of both C5 and C6 sugars to produce biofuels and bioproducts is a key goal for the development of integrated lignocellulosic biorefineries. Previously we found that although engineered <i>Zymomonas mobilis</i> 2032 was able to ferment glucose to ethanol when fermenting highly concentrated hydrolyzates such as 9% glucan-loading AFEX-pretreated corn stover hydrolyzate (9% ACSH), xylose conversion after glucose depletion was greatly impaired. We hypothesized that impaired xylose convers  ...[more]

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