Difference between revisions of "Part:BBa K325909:Experience"

[http://2012.igem.org/Team:Peking Peking 2012 iGEM team]

We successfully constructed light communication system using this part-luxbrick, and it was the very first time that cells were able to response to very dim bio-luminesence emitted from luxbrick. Also we made supplementary characterization of it.
See our project of light communication, please click [http://2012.igem.org/Team:Peking/Project/Communication here]

To improve the easy-of-use of luxbrick, we created a new part T7-Lux Operon by placing the coding sequence of luxCDABEG genes under T7 promoter, making it easy to be used in other systems. see the detail of T7-lux Operon please click here

Here are the brief results of our light communication system:
The photo below shows that our light sensing cells transformed with our luminesensor BBa_K819005 and corresponding promoter-GFP respond to bio-luminescence quite sensitively. The GFP expression is repressed by bio-luminescence, just like how it is repressed by blue LED light source, indicating that our luminesensor can detect bio-luminescence from luxbrick, enabling cell-cell communication through light.

Figure 1. The treatment to each group (upper) and resulted responses of light sensing cell (lower)

Figure 2. TOP10 cells transformed with luxbrick from Cambridge 2010 iGEM team

As a part of our project, we set out to investigate the conditions which affect the output of the LuxBrick. As we are using various elements from this Biobrick, we believe that is cornersome to know how we may increase its output by modifying the conditions that affect its behaviour.

We set out to understand diverse factors that could be influencing the total bioluminescence yield of the brick. Some of them have direct relation with some of the aspects of our project. These factors are: Glucose concentration, Growth state at time of induction, Cell mass and Temperature. You can read the fundamentations of the experiment and our interpretation of the results [http://2012.igem.org/Team:UC_Chile/Results/LuxBrick here]. Here you'll find detailed the [http://2012.igem.org/Team:UC_Chile2/Protocols#Characterization_Protocols characterization methods] we used in this experiment.

[http://2012.igem.org/Team:Fudan_Lux 2012iGEM team Fudan_Lux]

In 2012 iGEM competition we measured growth curve of K325909 in a E.coli strain dH5α.

The curve shows that induced by the arabinose, the bacteria growth

Check the RAW data of measurement.

[http://2012.igem.org/Team:Peking/Project/Communication Peking 2012 iGEM team]

We successfully constructed light communication system using this part-luxbrick, and we made supplementary characterization of it.
Spectrum
We measured the spectrum of luminescence produced by luxbrick. As shown in the spectrum below, the luminescence has a maximum intensity at 485nm.

Figure 1. TOP10 cells harboring the luxbrick were cultured in LB medium and induced with L-arabinose at 10^-3M. 10 hours after induction, the glowing cells were measured for spectrum using SHIMADZU RF5301PC Spectrofluorophotometer. (Peking iGEM 2012)

Time course-video
We showed the time course of light emitting process of TOP10 cells transformed with luxbrick in a more visualized way, which is a short video. In the movie, the cells begin to glow 9 hours after induction, and the entire visible glowing process lasts about 10 hours. (Peking iGEM 2012)

See the video, please click [http://www.youtube.com/watch?v=fnhe1MKIO9Q&feature=youtu.be here].
(If you can't see the video above, please click [http://v.youku.com/v_show/id_XNDU0NDU0NDcy.html here])