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Part:BBa_K1653006:Experience
Designed by: Yoshiharu Otaki, Daiki Haraguchi Group: iGEM15_Nagahama (2015-05-31)
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Applications of BBa_K1653006
The following graphs show that overexpressing marA gives resistance against geraniol and decrease intracelluler geraniol concentration.
marA device BBa_K16530020
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Fig. 1: Intracellular geraniol concentrations of E. coli JM109 (WT) and its overexpressing of marA strain, E. coli JM109 (marA).
In this figure, intracellular content of geraniol was less in the strain E. coli JM109 (marA) than the strain E. coli JM109 (WT). The concentrations of intracellular geraniol from E. coli JM109 (marA) was 42.9 μg/ml, which was 40% lower than that from of E. coli JM109 (WT), 72.2 μg/ml. This figure is suggesting that internalized geraniol could be more efficiently exported through AcrAB-TolC efflux pump following the presumed activation of this gene by introducing the activator marA gene.
In this figure, intracellular content of geraniol was less in the strain E. coli JM109 (marA) than the strain E. coli JM109 (WT). The concentrations of intracellular geraniol from E. coli JM109 (marA) was 42.9 μg/ml, which was 40% lower than that from of E. coli JM109 (WT), 72.2 μg/ml. This figure is suggesting that internalized geraniol could be more efficiently exported through AcrAB-TolC efflux pump following the presumed activation of this gene by introducing the activator marA gene.
Resistance
Fig. 2: Colony formation efficiencies of E. coli JM109 engineered with marA on geraniol overlaid plates.
E. coli JM109 and E. coli JM109 (marA) were spotted on LBGMg agar plates in serial ten-fold dilutions (10⁻¹～10⁻⁵), overlaid with 1.0 % (V/V) geraniol hexane solution (geraniol solution), and incubated at 30°C for 24 h. This figure shows that E. coli JM109 (marA) cells that overexpress the marA product is more survived on 1.0 % geraniol solution overlay plates than the counterpart control E. coli JM109 wild type cells.
E. coli JM109 and E. coli JM109 (marA) were spotted on LBGMg agar plates in serial ten-fold dilutions (10⁻¹～10⁻⁵), overlaid with 1.0 % (V/V) geraniol hexane solution (geraniol solution), and incubated at 30°C for 24 h. This figure shows that E. coli JM109 (marA) cells that overexpress the marA product is more survived on 1.0 % geraniol solution overlay plates than the counterpart control E. coli JM109 wild type cells.
Fig. 3: Comparison of colony numbers after addition of 0.5 %( V/V) geraniol hexane solution (geraniol solution).
Time interval for treatment was set every 1 hour from 1 hour to 4 hours. A: E. coli JM109 (WT) + hexane; B: E. coli JM109 (marA) + hexane; C: E. coli JM109 (WT) + 0.5 % geraniol solution; D: E. coli JM109 (marA) + 0.5 % geraniol solution. As shown in Figs. 2 A and B, treatment with hexane of E. coli JM109 (WT) and of E. coli JM109 (marA) showed similar colony numbers during these treatment intervals to those of time zero. This result suggests that hexane at this concentration and duration of time for 4hours did not affect both cell growth. In contrast, treatment with geraniol of E. coli JM109 (WT) and of E. coli JM109 (marA) showed toxicities to both strains (Figs. 3 B, C and D). If we watch the colony numbers carefully, E. coli JM109 (marA) had more than E. coli JM109 (WT) during these treatment intervals ((Figs. 3 C and D). These results demonstrate that toxicity of the geraniol was less to the strain E. coli JM109 (marA) than the strain E. coli JM109 (WT).
Time interval for treatment was set every 1 hour from 1 hour to 4 hours. A: E. coli JM109 (WT) + hexane; B: E. coli JM109 (marA) + hexane; C: E. coli JM109 (WT) + 0.5 % geraniol solution; D: E. coli JM109 (marA) + 0.5 % geraniol solution. As shown in Figs. 2 A and B, treatment with hexane of E. coli JM109 (WT) and of E. coli JM109 (marA) showed similar colony numbers during these treatment intervals to those of time zero. This result suggests that hexane at this concentration and duration of time for 4hours did not affect both cell growth. In contrast, treatment with geraniol of E. coli JM109 (WT) and of E. coli JM109 (marA) showed toxicities to both strains (Figs. 3 B, C and D). If we watch the colony numbers carefully, E. coli JM109 (marA) had more than E. coli JM109 (WT) during these treatment intervals ((Figs. 3 C and D). These results demonstrate that toxicity of the geraniol was less to the strain E. coli JM109 (marA) than the strain E. coli JM109 (WT).
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