Part:BBa_K914000:Experience
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Applications of BBa_K914000
the supD gene rescues the kanamycin resistance at any concentration of the antibiotic. It shows also that there is no disadvantage to use the supD amber suppressor compared to the wild type kanamycin gene resistance, since there is no difference of growth rate (Figure 4B and 4C). However the leakiness of the Kan* gene is higher than expected, and thus one mutation is not sufficient for the containment. Indeed, at usual concentration, Kan* gene manages to express an antibiotic resistance, even though lower than KanR or supD (Figure 4A). Here we define the growth rate as the OD600 observed at a given time (here t=8h20'), in order to overcome the fact that Kan*+RFP does not have a clear exponential phase. The fact that the strain (3) grows faster and can have higher OD600 may be explain by the fact that supD is deleterious for the strain, by removing some stop codon of other genes for instance.
This part has been improved by part BBa_K2725016 - supD expressed under J23108 anderson promotor (strength 0.51). This expression level of supD allows the expression of a gene with 5 serine codons substituted for amber STOP codons.
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