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Team:Arizona State/Data
From 2013.igem.org
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<center><img src="https://static.igem.org/mediawiki/2013/a/a2/E._Coli_Nissile_Probiotic_Vaccine.png" width="800"></center> | <center><img src="https://static.igem.org/mediawiki/2013/a/a2/E._Coli_Nissile_Probiotic_Vaccine.png" width="800"></center> | ||
</p> | </p> | ||
| - | <center><p><i>Figure 1: Assembled biobricks expressed in E.coli Nissile. Blue: BBa_K1190002 Coding sequence for Lysteriolysin O pore-forming complex. Red: BBa_K1190000 and BBa_K1190004 Modular pathogenic antigen of choice. For our project, we used Melan-A (MART-1) and FluM1 target antigens Green: BBa_K1190003 Granulocyte Macrophage Colony-Stimulating Factor with Yeb bacterial secretion tag | + | <center><p><i>Figure 1: Assembled biobricks expressed in E.coli Nissile.</i></p></center> |
| + | <center><p>Blue: BBa_K1190002 Coding sequence for Lysteriolysin O pore-forming complex.</p></center> | ||
| + | <center><p>Red: BBa_K1190000 and BBa_K1190004 Modular pathogenic antigen of choice. For our project, we used Melan-A (MART-1) and FluM1 target antigens</p></center> | ||
| + | <center><p>Green: BBa_K1190003 Granulocyte Macrophage Colony-Stimulating Factor with Yeb bacterial secretion tag</p></center> | ||
<br> | <br> | ||
<h3><center>Overview of Dendritic Cell Response Process</center></h3> | <h3><center>Overview of Dendritic Cell Response Process</center></h3> | ||
Revision as of 01:33, 28 September 2013
Technical Design
E. coli Nissle 1917 will be engineered to secrete granulocyte colony-macrophage stimulating factor (GM-CSF) to attract dendritic cells (DCs). GM-CSF is a well-studied immunostimulant used in multiple clinical vaccines. The modular nature of this secretion system allows the bacteria to also secrete adjuvants and other immunostimulants to provoke a variety of immune responses. The bacteria will target dendritic cells via cell surface expression of the anti-DEC-205 single-chain variable fragment (scFv), which targets the DC endocytic protein DEC-205 and facilitates bacterial uptake by the DC. Once enside the dendritic cell endosome, the acidic conditions will activate the expression of the listeriolysin O (LLO) protein in the bacteria, which will shear the endosome and allow the cancer cell markers expressed in the bacteria to enter to DC cytosol. Expression of the LLO protein is inhibited in neutral and basic conditions by an antisense RNA to the RBS of the composite LLO sequence, functionally creating a genetic pH switch for LLO expression. Cytosolic presence of cancer cell antigens allows them to be expressed on DC major histocompatibility complex (MHC) Class I molecules, which are critical to activate a Cytotoxic T Lymphocyte (CTL) response.
The aDEC-205 scFv and the pH switch for LLO expression were later delegated as future tasks to improve vaccine safety and efficiency.
Vaccine Chassis
Figure 1: Assembled biobricks expressed in E.coli Nissile.
Blue: BBa_K1190002 Coding sequence for Lysteriolysin O pore-forming complex.
Red: BBa_K1190000 and BBa_K1190004 Modular pathogenic antigen of choice. For our project, we used Melan-A (MART-1) and FluM1 target antigens
Green: BBa_K1190003 Granulocyte Macrophage Colony-Stimulating Factor with Yeb bacterial secretion tag
Overview of Dendritic Cell Response Process
1. Pinocytosis of E. coli vaccine by a Dendritic Cell
2. Lysosome and E. Coli Nissile Undergoing Lysis within a Dendritic Cell
3. MHC Class 1 Complex Assembled within Endoplasmic Reticulum
4. MHC Class 1 Complex Elicits Cytotoxic T Cell Response
