Team:Bielefeld-CeBiTec/Results/CO2-fixation

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<h1> CO<sub>2</sub> fixation </h1>
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<h1>Module II - Carbon Dioxide (CO<sub>2</sub>) Fixation </h1>
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The second module aims to change E.coli in a way that it binds carbon dioxide like an autotroph organism. For this we want to establish the Calvin-cycle. E.coli has all enzymes for the Calvin-cycle except of three.<br>
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The particular aim of the second module is to implement the carbon dioxide fiaxtion in <i>E.&nbsp;coli</i>. Therefore we selected the Calvin cycle (figure 1) and used a bottom up approach. All heterologous expressed components, like the <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Results/CO2-fixation/Calvin-Cycle" target="_blank">sedoheptulose-1,7-bisphosphatase (<i>glpX</i>)</a>, the phosphoribulokinase (<i>prkA</i>) , the <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Results/CO2-fixation/RuBisCO" target="_blank">ribulose-1,5-bisphosphate carboxylase/oxygenase</a>  (RuBisCO) were tested separately in various experiments. The RubisCO is known to function best under high CO<sub>2</sub> concentration. To accomplish optimal conditions for the RubisCO in a very local enviroment a microcompartiment from <i>Halothiobacillus&nbsp;neapolitanus</i>, which is called carboxysome, was constructed in <i>E.&nbsp;coli</i>.  
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<center>[picture 1]</center><br>
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The different results for all three enzymes are mentioned in the <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Results/CO2-fixation/Calvin-Cycle" target="_blank">Calvin-cycle</a> section. One important step for the carbon dioxide fixation is the <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Results/CO2-fixation/RuBisCO" target="_blank">RuBisCO</a> (Ribulose 1,5-bisphosphate carboxylase/oxygenase). For E.coli we decided to transform genes for the <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Results/CO2-fixation/Carboxysome" target="_blank">carboxysome</a> because of its properties.  
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      <a href="https://static.igem.org/mediawiki/2014/5/54/Bielefeld-CeBiTec_2014-10-11_Carboxy_weiss_wiki.png" target="_blank"><img src="https://static.igem.org/mediawiki/2014/5/54/Bielefeld-CeBiTec_2014-10-11_Carboxy_weiss_wiki.png" width="450px"></a><br>
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<font size="2" style="text-align:center;"><b>Figure 1:</b> Schematic representation of the Calvin cylce. The reactions shown in green can be catalyzed by enzymes that naturally exist in <i>E.&nbsp;coli</i>, while the red ones need to be expressed heterologous to enable the whole <a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Results/CO2-fixation/Calvin-Cycle">Calvin cycle</a> in <i>E.&nbsp;coli</i>.</font>
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<a href="https://2014.igem.org/Team:Bielefeld-CeBiTec/Notebook/Journal/CO2-fixation">Here</a> you will find information about the execution of our experiments.
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Latest revision as of 02:57, 18 October 2014


Module II - Carbon Dioxide (CO2) Fixation

The particular aim of the second module is to implement the carbon dioxide fiaxtion in E. coli. Therefore we selected the Calvin cycle (figure 1) and used a bottom up approach. All heterologous expressed components, like the sedoheptulose-1,7-bisphosphatase (glpX), the phosphoribulokinase (prkA) , the ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO) were tested separately in various experiments. The RubisCO is known to function best under high CO2 concentration. To accomplish optimal conditions for the RubisCO in a very local enviroment a microcompartiment from Halothiobacillus neapolitanus, which is called carboxysome, was constructed in E. coli.



Figure 1: Schematic representation of the Calvin cylce. The reactions shown in green can be catalyzed by enzymes that naturally exist in E. coli, while the red ones need to be expressed heterologous to enable the whole Calvin cycle in E. coli.