Enhancement of geraniol resistance of Escherichia coli by MarA overexpression

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Title
Enhancement of geraniol resistance of Escherichia coli by MarA overexpression
Author(s)
A A Shah; C Wang; Y R Chung; J Y Kim; Eui Sung Choi; S W Kim
Bibliographic Citation
Journal of Bioscience and Bioengineering, vol. 115, no. 3, pp. 253-258
Publication Year
2013
Abstract
Improvement of a microorganism's tolerance against organic solvents is required for a microbial factory producing terpenoid based biofuels. The bacterial genes, marA, imp, cls and cti have been found to increase organic solvent tolerance. Thus, the tolerance against the following terpenoids (isopentenol, geraniol, myrcene, and farnesol) was studied with overexpression of marA, imp, cls and cti genes in Escherichia coli. The marA overexpression significantly enhanced the tolerance of E. coli against geraniol, whereas there was no tolerance improvement against the terpenoids by overexpression of cls and cti genes. The imp overexpression even yielded sensitive phenotype to the tested solvents. The colony forming efficiency of the marA overexpressing E. coli was increased by 104-fold in plate overlay of geraniol compared to that of wild type E. coli and a two-fold decrease of intracellular geraniol accumulation was also observed in liquid culture of geraniol. Single knock-out mutations of marA, or one of the following genes (acrA, acrB and tolC) encoding AcrAB-TolC efflux pump made E. coli hypersensitive to geraniol. The geraniol tolerance conferred by marA overexpression was attributed to the AcrAB-TolC efflux pump that is activated by MarA.
Keyword
Efflux pumpEscherichia coliGeraniolMarATerpenoid tolerance
ISSN
1389-1723
Publisher
Soc Bioscience Bioengineering Japan
DOI
http://dx.doi.org/10.1016/j.jbiosc.2012.10.009
Type
Article
Appears in Collections:
Division of Bio Technology Innovation > BioProcess Engineering Center > 1. Journal Articles
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