Difference between revisions of "Team:Aix-Marseille/Design"
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"image voie de biosynthese de siderophore" | "image voie de biosynthese de siderophore" | ||
| − | <p>Our strategy for the siderophore mobilisation results in two main steps :</p> | + | <p>Previous work showed that siderophore which are molecule secreted by bacteria to catch iron are able to catch other metals by default. Especifically, many articles showed a high affinity of Desferrioxamine B ( produce by <i> Streptomyces coelicolor</i> for tetravalent metal ions and more specifically platinum. These results encouraged us to make a biobrick coding the sequence corresponding to the 4 enzymes involved on the metabolic pathway of Desferrioxamine B. <i> E. coli </i> was used to produce this biobrick. Produce a gram positive bacteria pathway in a gram negative bacteria is constaingnant, considering the risk of toxicity for the conductress bacteria. To counter this potential issue, we regulate trasnscription using the control of an inductible promotor (pBAD/araC). |
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| + | Our strategy for the siderophore mobilisation results in two main steps :</p> | ||
<ul> | <ul> | ||
<li> Transformation of E.Coli with an inductible plasmide holding the <i><u>des</u></i> cluster</li> | <li> Transformation of E.Coli with an inductible plasmide holding the <i><u>des</u></i> cluster</li> | ||
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</ul> | </ul> | ||
| − | <p>Then the produced siderophore would be transfered in the recuperation solution containing the platinum. Therefore, the platinum and other metal must be recruit by our purified | + | <p>Then, the produced siderophore would be purified and transfered in the recuperation solution containing the platinum. Therefore, the platinum and other metal must be recruit by our purified siderophores. Though those siderophores would be import using a sowing of <i>Streptomyces coelicolor </i>. Then simple centrifugation and combustion will concentrate the solution in metal a first time. </p> |
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<li> the ambient reducer power reduces ions into oxydised nanoparticules</li> | <li> the ambient reducer power reduces ions into oxydised nanoparticules</li> | ||
</ul> | </ul> | ||
| − | <p><i> | + | <p><i>It was shown that proteins are able to bind platinium and especially bacteria flagellum which are naturally a high platinum adsober. Furthermore, many peptides were generated based on sequences selected by phage display in order to enhance metal ions adsorpion including gold, silver and platinium. </p> |
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| − | </p> | + | |
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| − | </div> | + | <p>All together, these findings incite us to use these natural properties to build a biobrick which is a high affinity binder of platinium based on <i>E. coli</i> and <i> Desulfovibrio vulgaris </i> flagellum and synthetic peptides sequences. To this end, we analyze the flagellin sequence and structural proprieties of the external part of the flagel. Then, on the part of the flagellin faced to the extarnal medium, an insertion restriction site will be inserted. Then specific precious metal peptides would be added using this insertion site to increase the level of adsorbsion specificity and yield. In this way, peptide would be faced to the external medium and able to bind metallic ions. To obtain a high transcription level of this sequence, we put transcription control under a strong promotor enabling a high flagellin production. </p> |
| + | <p>Next, the flagellin produced will be added to the first concentrated platinum solution. Flagellin containing specific peptides will bind the free or available ions of the medium and reduce them into oxydised nanoparticules usable in industry. A simple centrifugation of the flagellin binding to the platinum allow to concentrate the metal a second time </p> | ||
| + | </div> | ||
</div> | </div> | ||
