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ptogenetic tools have made significant impact on life sciences and beyond. However, several serious issues remain: cytotoxicy, narrow dynamic range, and dependency on laser and exogenous chromophore. To circumvent these, Peking iGEM has rationally constructed a hypersensitive sensor of luminance -- Luminesensor. Primarily, the sensor was designed by fusing blue-light-sensing protein domain from Neurospora with DNA binding domain of LexA from E. coli, following which protein structure inspection and kinetic simulation were conducted to rationally perform optimization. Amazingly, Luminesensor was proved to be as sensitive as to sense natural light and even bioluminescence. With this sensor, spatiotemporal control of cellular behavior, such as high-resolution 2D and 3D bio-printing using dim light and even luminescence of iPad were shown to be very easy. What’s more, we successfully implemented cell-cell signaling using light, which is the very first time in synthetic biology and of great importance for biotechnological use.


Peking iGEM would never disappoint you!

With strong motivation to raise a new generation of optogenetics, Peking iGEM team has rationally constructed a hypersensitive sensor of luminance – what we call the Luminesensor, with which spatiotemporal control of biochemical process or cellular behavior is highly feasible. It provides a paradigm for rational design of sensor.

The ultrasensitive Luminesensor is able to respond to very dim light and still maintain a high dynamic range. That encouraged Peking iGEM to explore the possibility of cell-cell communication through light. We have successfully implemented, for the very first time, light-communication among cells without direct physical contact.

3D printing is a new technology that has been rising for many years. But in the realm of synthetic biology, it is far from developed. We exploited our Luminesensor to implement 3D printing that can be utilized in many applications in medical or manufacturing.

"Phototatic" bacteria can be built by programming the chemotaxis system in E. coli through light. By controlling the expression level of the cheZ protein with Luminesensor, the tumbling frequency is coupled to the intensity of light signals.

We have done a remarkable job in motivating high school students to study synthetic biology and guiding them towards future participation in the iGEM high school division. Besides, we collaborated with a lab and helped 4 other iGEM teams by sharing DNA materials, characterizing their parts and modeling. What's more, we presented all fresh iGEMers with a collection and praise of historic iGEM projects to share and learn from each other!

We conducted excellent modeling to rationally design our Luminesensor, combining protein kinetics, thermodynamics, and stochastic simulation with molecular docking together. On the other hand, when modeling the process of photo-taxis, we also developed a hexagonal-coordinate simulation environment for dynamic system on a continuous plane, which would be a very useful prototype for future simulation on cellular motion.