Team:KULeuven/Project/Input

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==Input==
==Input==
 +
Searching for an input signal that was easily turned on and off, we chose to use the light-sensing device '''BBa_M30109'''. This device has already been used by a number of teams:
 +
* '''listing team'''
 +
For the sake of completeness, we describe it here again.
-
Searching for an input signal that was easily turned on and off, we chose to use the light-sensing device '''BBa_M30109'''. This device has already been used by a number of teams. For the sake of completeness, we describe it here again.
+
===BioBricks===
 +
('''figuur input''')
-
The first step is to produce ''ho1'' (heme oxidase 1) that converts heme to biliverdin IXalpha. This enzyme is encoded by '''BBa_I15008'''. The second step is to produce ''PcyA'' (phycocyanobilin:ferredoxin oxidoreductase) that converts the biliverdin IXalpha to phycocyanobilin. This enzyme is encoded by '''BBa_I15009'''. This phycocyanobilin associates with the light receptive domain Cph1 of a Cph1/EnvZ fusion protein, encoded by '''BBa_I15010'''.
+
===Components===
 +
The first step is to produce ''ho1'' (heme oxigenase 1) that converts heme to biliverdin IXalpha. This enzyme is encoded by '''BBa_I15008'''. The second step is to produce ''PcyA'' (phycocyanobilin:ferredoxin oxidoreductase) that converts the biliverdin IXalpha to phycocyanobilin. This enzyme is encoded by '''BBa_I15009'''. This phycocyanobilin associates with the light receptive domain Cph1 of a Cph1/EnvZ fusion protein, encoded by '''BBa_I15010'''.
 +
===Action===
The ''ho1'' and ''PcyA'' coding parts are placed under a Pbad promoter. As AraC is present in the cell, phycocyanobilin will only be made upon activation with arabinose. The coding part for the Cph1/EnvZ fusion protein is placed under control of a pTet promoter, which means that, as TetR is present, the fusion protein will only be produced when aTc is added to the medium. This gives us the possibility to test the system with an exogenous memory instead of the endogenous one, which will then be added later on in the project.
The ''ho1'' and ''PcyA'' coding parts are placed under a Pbad promoter. As AraC is present in the cell, phycocyanobilin will only be made upon activation with arabinose. The coding part for the Cph1/EnvZ fusion protein is placed under control of a pTet promoter, which means that, as TetR is present, the fusion protein will only be produced when aTc is added to the medium. This gives us the possibility to test the system with an exogenous memory instead of the endogenous one, which will then be added later on in the project.
-
 
[[Image:input.png|300px|right]] It is the Cph1 part of the fusion protein that acts as the light sensor, the EnvZ part is a kinase. Upon radiation with 660nm (red) light, the fusion protein gets dephosphorylated. This renders the kinase in an inactive state. The active kinase phosphorylates the molecule ompR. A high concentration of the phosphorylated ompR represses the OmpF promoter. A lower concentration activates it. So when 660nm light is irradiated on the input mechanism, the concentration of phosphorylated ompR drops and the OmpF promoter is turned on.
[[Image:input.png|300px|right]] It is the Cph1 part of the fusion protein that acts as the light sensor, the EnvZ part is a kinase. Upon radiation with 660nm (red) light, the fusion protein gets dephosphorylated. This renders the kinase in an inactive state. The active kinase phosphorylates the molecule ompR. A high concentration of the phosphorylated ompR represses the OmpF promoter. A lower concentration activates it. So when 660nm light is irradiated on the input mechanism, the concentration of phosphorylated ompR drops and the OmpF promoter is turned on.

Revision as of 13:48, 30 July 2008

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					<a href="https://2008.igem.org/Team:KULeuven/Data/Input">Input</a>
					<a href="https://2008.igem.org/Team:KULeuven/Data/Output">Output</a>
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Pictogram input.png

Contents

Input

Searching for an input signal that was easily turned on and off, we chose to use the light-sensing device BBa_M30109. This device has already been used by a number of teams:

  • listing team

For the sake of completeness, we describe it here again.

BioBricks

(figuur input)

Components

The first step is to produce ho1 (heme oxigenase 1) that converts heme to biliverdin IXalpha. This enzyme is encoded by BBa_I15008. The second step is to produce PcyA (phycocyanobilin:ferredoxin oxidoreductase) that converts the biliverdin IXalpha to phycocyanobilin. This enzyme is encoded by BBa_I15009. This phycocyanobilin associates with the light receptive domain Cph1 of a Cph1/EnvZ fusion protein, encoded by BBa_I15010.

Action

The ho1 and PcyA coding parts are placed under a Pbad promoter. As AraC is present in the cell, phycocyanobilin will only be made upon activation with arabinose. The coding part for the Cph1/EnvZ fusion protein is placed under control of a pTet promoter, which means that, as TetR is present, the fusion protein will only be produced when aTc is added to the medium. This gives us the possibility to test the system with an exogenous memory instead of the endogenous one, which will then be added later on in the project.

Input.png
It is the Cph1 part of the fusion protein that acts as the light sensor, the EnvZ part is a kinase. Upon radiation with 660nm (red) light, the fusion protein gets dephosphorylated. This renders the kinase in an inactive state. The active kinase phosphorylates the molecule ompR. A high concentration of the phosphorylated ompR represses the OmpF promoter. A lower concentration activates it. So when 660nm light is irradiated on the input mechanism, the concentration of phosphorylated ompR drops and the OmpF promoter is turned on.