Global transcriptome response to ionic liquid by a tropical rain forest soil bacterium, Enterobacter lignolyticus.

TitleGlobal transcriptome response to ionic liquid by a tropical rain forest soil bacterium, Enterobacter lignolyticus.
Publication TypeJournal Article
Year of Publication2012
AuthorsKhudyakov JI, D'haeseleer P, Borglin SE, Deangelis KM, Woo H, Lindquist EA, Hazen TC, Simmons BA, Thelen MP
JournalProc Natl Acad Sci U S A
Volume109
Issue32
PaginationE2173-82
Date Published2012 Aug 7
ISSN1091-6490
Abstract

To process plant-based renewable biofuels, pretreatment of plant feedstock with ionic liquids has significant advantages over current methods for deconstruction of lignocellulosic feedstocks. However, ionic liquids are often toxic to the microorganisms used subsequently for biomass saccharification and fermentation. We previously isolated Enterobacter lignolyticus strain SCF1, a lignocellulolytic bacterium from tropical rain forest soil, and report here that it can grow in the presence of 0.5 M 1-ethyl-3-methylimidazolium chloride, a commonly used ionic liquid. We investigated molecular mechanisms of SCF1 ionic liquid tolerance using a combination of phenotypic growth assays, phospholipid fatty acid analysis, and RNA sequencing technologies. Potential modes of resistance to 1-ethyl-3-methylimidazolium chloride include an increase in cyclopropane fatty acids in the cell membrane, scavenging of compatible solutes, up-regulation of osmoprotectant transporters and drug efflux pumps, and down-regulation of membrane porins. These findings represent an important first step in understanding mechanisms of ionic liquid resistance in bacteria and provide a basis for engineering microbial tolerance.

DOI10.1073/pnas.1112750109
Alternate JournalProc. Natl. Acad. Sci. U.S.A.
PubMed ID22586090