"
Team:UNITN-Trento/Project/Blue light
From 2013.igem.org
| Line 123: | Line 123: | ||
</li> | </li> | ||
<li> | <li> | ||
| - | + | 1 white light bulb. | |
</li> | </li> | ||
</ul> | </ul> | ||
| Line 129: | Line 129: | ||
<img class="photo" src="https://static.igem.org/mediawiki/2013/e/e8/Tn-2013_different_lights_pic.jpg" style="width: 44%; height: 283px;"/> | <img class="photo" src="https://static.igem.org/mediawiki/2013/e/e8/Tn-2013_different_lights_pic.jpg" style="width: 44%; height: 283px;"/> | ||
<span class="caption"> | <span class="caption"> | ||
| - | <b>Fig. 1: Different light sources induction power.</b> We had massive production of amilCP at LED light (4) and white light (3), instead exposure to the blue light bulb (2) induced a little less but still way more than the dark control ( | + | <b>Fig. 1: Different light sources induction power.</b> We had massive production of amilCP at LED light (4) and white light (3), instead exposure to the blue light bulb (2) induced a little less but still way more than the dark control (1): probably white light worked as well because it included the right wavelength (470), instead the blue bulb wavelength range is unknown, so we could assume that the right WL was not as much intense as in the other sources. |
</span> | </span> | ||
</div> | </div> | ||
Revision as of 12:06, 21 September 2013
Results - Blue Light
We decided to develop a photo-inducible genetic circuit that triggers the production of Ethylene in presence of blue light (470 nm), and stops at dark.
We thought to use blue light as our inducer because it would fit perfectly to our very own B. fruity vending machine, being the easiest way to control a genetic device in a totally automated scaffold. All parts have been transformed and characterized in E. coli (strain NEB10b).
The device
We aimed at first to get ethylene production at blue light (470 nm) and the off state at dark, so we went for the design of a blue light dependent device that includes an inverter cassette.
BBa_K1065310
We engineered in E. coli a blue-light sensor composed by:
- Anderson promoter BBa_J23100;
- the blue light receptor YF1, which consist of YtvA from B. subtilis fused to a kinase domain (fixL) from B. japonicum (Möglich A, Ayers RA, Moffat K. 2008);
- its response regulator, FixJ;
- a downstream promoter PfixK2, which is turned off by phosphorylated FixJ;
- an inverter cassette composed of cI and Plambda;
- a reporter (chromoprotein amilCP), which was later substituted by EFE (our ethylene forming enzyme).
To assemble this device we used the following parts from the registry:
- Bba_J23100 from Berkeley 2006 iGEM team;
- Bba_K592016 from Uppsala 2011 iGEM team;
- BBa_K592020 from Uppsala 2011 iGEM team.
We characterized this circuit along with the version without the inverter cassette (activated at dark and inhibited by blue light). Thus we also created the part:
BBa-Bba_K1065302
If you are interested in all the molecular details of these circuits, please check our datapage
Different sources of blue light induces AmilCP production in the "inverted circuit"
We first assembled the “inverted circuit” with a blue chromo-protein (AmilCP) downstream instead of EFE to obtain easy-to-watch and clear characterization results.
At first we compared the induction power of several light sources:
- 1 LED blue light;
- 1 blue light bulb;
- 1 white light bulb.
Fig. 1: Different light sources induction power. We had massive production of amilCP at LED light (4) and white light (3), instead exposure to the blue light bulb (2) induced a little less but still way more than the dark control (1): probably white light worked as well because it included the right wavelength (470), instead the blue bulb wavelength range is unknown, so we could assume that the right WL was not as much intense as in the other sources.
