Difference between revisions of "Part:BBa K557010"

Revision as of 21:52, 5 October 2011

ColicinE7+Toggle-switch+Aptamer-CheZ+lysis

Sequence and Features

Background

    From mid May to June 2011, enteropathogenic E.coli brings a big panic to many different European countries. Why such an ordinary bacteria as E.coli can lead to a clinical catastrophe and kill a lot of people? The answer may be complicate, but the most important reason is that we can not find out the pathogens rapidly and can not apply the effective treatments.To solve this problem, we try to use the normal E.coli, which keep the symbiotic relationship with us humanbeings, to be a safety weapon to defend ourselves against pathogens.

Figure1.Enteropathogenic Escherichia coli(left) brings us a big panic(right,Frank Bellew, New York Daily Graphic, September 29, 1873)

Purpose

    Using reprogrammed intestinal bacteria as a safety weapon to destroy the pathogens which invade the intestinal mucosal system.

Principle

    As shown in Figure2, When pathogens invade the intestinal epithelium ,they will release some kind of chemical signal. After the reprogrammed intestinal bacteria capture this signal, such signal can activate the expression of the function gene ,then it will drive the reprogrammed intestinal bacteria to move toward the infection site from the original colony. Then the moving reprogrammed bacteria will establish a new colony at the infection site, these bacteria will express some lethal proteins to kill pathogens by self-destruction, or spread some toxic small molecules to destroy the pathogens then start self-destruction, and the original colony will remain.

(a)

(b)

Figure2.Reprogrammed intestinal bacteria move towards the target and establish a colony(a),then destroy the taget(b)

Theoretical Design

Simulated Experiment Design and Results

Conclusion and Discussion

References