Team:ETH Zurich/Project

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=== ''E.coli''pse – Who’s your pABA: intelligent sun protection ===
 
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|''E.coli''pse is an intelligent and adaptive sun radiation protection system which responds to UV exposure with the production of the protective agent pABA. To detect hazardous levels of sun radiation our system is based on UVR-8, a UV sensing protein from plants. In its dark state, this protein forms a homodimer that dissociates upon UV radiation.
 
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|We fused UVR-8 with the DNA binding domain from TetR, which is unable to dimerize and to bind DNA in monomeric form. UV-exposure might force the TetR-UVR8 fusion dimer to split, release the DNA and enable transcription. Thus, TetR-UVR8 might act as a light-activated on-switch in bacteria.
 
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|We plan to use this novel switch to start the production of ''para''-aminobenzoic acid (p-ABA), a common ingredient of sunscreen, and - dependent on the intensity and duration of exposure as determined by our detailed in silico model - a colored pigment as a visible warning signal.
 
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== Overview ==
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===  [https://2012.igem.org/Team:ETH_Zurich/UVR8 UVR8-TetR<sub>DBD</sub>] ===
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[[File:UVR8.png|frameless|250px|right|thumb|Fig. 1 UVR8 homodimer <span class='eth_reference'>[Christie2012]</span>]]
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We introduce and implement a novel two-hybrid screening for ''E.coli'' using the TetR-DNA binding domain. TetR<sub>DBD</sub> on its own is unable to bind to the P<sub>tet</sub> promoter. After fusing it to the dimerizing UVR8 (Fig. 1), a UV-B-detecting-protein from plants, in different ways  - repression occured.
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===  [https://2012.igem.org/Team:ETH_Zurich/Decoder Decoder] ===
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Our decoder (Fig. 2) aims to combine blue and red light to distinguish between different lightsources like sunlight or room light. For this we use LovTAP and Cph8 and perform the calculation with the help of three NOR gates each represented by a new designed hybrid promoter.
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LovTAP is a fusion of a photoreceptor with a transcriptional regulator TrpR. This fusion protein can be activated by blue light and therefore act as a transcriptional switch. We want to use this system for the light intensity measurement and as an input for our decoder.
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Cph8 consists of the light-receptor Cph1 that is deactivated by red light and the histidine kinase EnvZ responsible for the downstream signaling. We aim to use it for our decoder as a red-light-sensor.
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[[File:Design.jpg|frameless|500px|left|thumb|Fig. 2 Boolean logic of Decoder]]
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<br><br><br><br><br><br><br>
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===[https://2012.igem.org/Team:ETH_Zurich/PABA Para-Aminobenzoic acid]===
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[[Image:PABA.png|left|thumb|100px|''Figure 2'': 4-para-aminobenzoic acid, natural occuring UV light absorbing molecule used in sunscreens]]
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As an output of either our direct or our indirect sun detection we are planing to produce para-Aminobenzoic acid (PABA). PABA is able to absorb UVB light and therefore will act as an active ingredient in our intelligent sunscreen. 
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In paralel to PABA we are going to produce a violet pigment. This will serve as a warning signal to avoid further sun exposure.
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Latest revision as of 23:31, 26 October 2012

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Contents

Overview

UVR8-TetRDBD

Fig. 1 UVR8 homodimer [Christie2012]

We introduce and implement a novel two-hybrid screening for E.coli using the TetR-DNA binding domain. TetRDBD on its own is unable to bind to the Ptet promoter. After fusing it to the dimerizing UVR8 (Fig. 1), a UV-B-detecting-protein from plants, in different ways - repression occured.

Decoder

Our decoder (Fig. 2) aims to combine blue and red light to distinguish between different lightsources like sunlight or room light. For this we use LovTAP and Cph8 and perform the calculation with the help of three NOR gates each represented by a new designed hybrid promoter. LovTAP is a fusion of a photoreceptor with a transcriptional regulator TrpR. This fusion protein can be activated by blue light and therefore act as a transcriptional switch. We want to use this system for the light intensity measurement and as an input for our decoder. Cph8 consists of the light-receptor Cph1 that is deactivated by red light and the histidine kinase EnvZ responsible for the downstream signaling. We aim to use it for our decoder as a red-light-sensor.

Fig. 2 Boolean logic of Decoder









Para-Aminobenzoic acid

Figure 2: 4-para-aminobenzoic acid, natural occuring UV light absorbing molecule used in sunscreens

As an output of either our direct or our indirect sun detection we are planing to produce para-Aminobenzoic acid (PABA). PABA is able to absorb UVB light and therefore will act as an active ingredient in our intelligent sunscreen.

In paralel to PABA we are going to produce a violet pigment. This will serve as a warning signal to avoid further sun exposure.


References

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