First, we innovatively introduced a bactericidal enzyme, lysozyme to annihilate the algal bloom. Besides, we found that the killing efficiency would be enhanced if the average distances between E.coli and cyanobacteria were reduced. Therefore, we introduced two improvement methods, Binding and Gas vesicle, to curtail this distance. The binding was accomplished by anchoring a protein that binds to Microcystis.aeruginosa specifically. Gas vesicle, kindly given by the OUC-China iGEM team, consists of a low-density protein complex that can make our E.coli float up to the water surface.
Then, except for treating the remarkable biomass of cyanobacteria, the toxins secreted by cyanobacteria contribute to other serious environmental problems. Thus we targeted to degrade the microcystin, one of the algal secreted peptide having hepatotoxic effect. We implemented a protein MlrA that can decrease its toxicity significantly.
Finally, our transgenic E.coli should be cleared away after completion of killing and degradation work because of biosafety concerns. Therefore, we used holin, a hole-forming membrane protein, and endolysin, a muralytic enzyme, to construct a suicide system which will be triggered when M. aeruginosa are killed and the concentration of specific inducer molecules decreases.
First, we innovatively introduced a bactericidal enzyme, lysozyme to annihilate the algal bloom. Besides, we found that the killing efficiency would be enhanced if the average distances between E.coli and cyanobacteria were reduced. Therefore, we introduced two improvement methods, Binding and Gas vesicle, to curtail this distance. The binding was accomplished by anchoring a protein that binds to Microcystis.aeruginosa specifically. Gas vesicle, kindly given by the OUC-China iGEM team, consists of a low-density protein complex that can make our E.coli float up to the water surface.Then, except for treating the remarkable biomass of cyanobacteria, the toxins secreted by cyanobacteria contribute to other serious environmental problems. Thus we targeted to degrade the microcystin, one of the algal secreted peptide having hepatotoxic effect. We implemented a protein MlrA that can decrease its toxicity significantly.Finally, our transgenic E.coli should be cleared away after completion of killing and degradation work because of biosafety concerns. Therefore, we used holin, a hole-forming membrane protein, and endolysin, a muralytic enzyme, to construct a suicide system which will be triggered when M. aeruginosa are killed and the concentration of specific inducer molecules decreases.
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