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Global transcriptomic analysis of the response of Corynebacterium glutamicum to ferulic acid

ABSTRACT: Corynebacterium glutamicum can survive by using ferulic acid as the sole carbon source. In this study, we assessed the response of C.glutamicum to ferulic acid stress by means of a global transcriptional response analysis. The transcriptional data showed that several genes involved in degradation of ferulic acid were affected. Moreover, several genes related to the stress response; protein protection or degradation and DNA repair; replication, transcription and translation; and the cell envelope were differentially expressed. Deletion of the katA or sigE gene in C. glutamicum resulted in a decrease in cell viability under ferulic acid stress. These insights will facilitate further engineering of model industrial strains, with enhanced tolerance to ferulic acid to enable easy production of biofuels from lignocellulose.

ORGANISM(S): Corynebacterium glutamicum ATCC 13032

PROVIDER: GSE86537 | GEO | 2017/09/01

SECONDARY ACCESSION(S): PRJNA342149

REPOSITORIES: GEO

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Project description:The presence of anti-microbial phenolic compounds, such as the model compound ferulic acid, in biomass hydrolysates poses significant challenges to the widespread use of biomass in conjunction with whole cell biocatalysis or fermentation. Biofuel toxicity must also be overcome to allow for efficient production of next generation biofuels such as butanol, isopropanol, and others for widespread usage. Currently, these inhibitory compounds must be removed through additional downstream processing or sufficiently diluted to create environments suitable for most industrially important microbial strains. This study explores the high ferulic acid and n-butanol tolerance in Lactobacillus brevis (L. brevis), a lactic acid bacteria often found in fermentation processes, by global transcriptional response analysis. The transcriptional profile of L. brevis under ferulic acid and butanol stress reveals that the presence of ferulic acid primarily triggers the expression of membrane proteins to counteract ferulic acid induced changes in membrane fluidity and ion leakage. In contrast to the ferulic acid stress response, butanol addition to growing cultures uniquely induced the entire fatty acid synthesis pathway in the midst of a generalized stress response. Overexpression of the rate-limiting acetyl-CoA carboxylase subunits (AccABCD) in E. coli to increase lipid synthesis had no effect on butanol tolerance, suggesting that additional engineering is necessary to produce sufficient levels of appropriate fatty acids to confer butanol tolerance. Several promising routes for understanding both phenolic acid and butanol tolerance have been identified based upon these findings. These insights may be used to guide further engineering of model industrial organisms to better tolerate both classes of inhibitors in processed biomass used for biofuel production. Cultures were grown to OD ~ 0.2 in MRS media (baffled flasks), T = 30 C, 100 rpm. Butanol was then added to the cultures. Samples were harvested 15, 75, and 135 min after butanol addition. Each time point has 3 biological replicates, and dye swaps were incorporated into the microarray experiments.

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Global transcriptomic analysis of the response of Corynebacterium glutamicum to ferulic acid

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