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Team:Bielefeld-CeBiTec/Results/CO2-fixation/RuBisCO
From 2014.igem.org
Module II - Carbon Dioxide (CO2) Fixation
Introduction
The Ribulose 1,5-bisphosphate Carboxylase Oxygenase (RuBisCO) is the most important enzyme in the Calvin cycle. It binds gaseous carbon dioxide to ribulose-1,5-bisphosphate (Ru-BP) generating two molecules of 3-phosphoglycerate (3-PGA). Therefore it is responsible for the fixation of carbon dioxide. 3-PGA is further converted in the Calvin cycle to glycerinaldehyde-3-phosphate. This is an essential intermediate in the central metabolism, as it plays a central role in glycolysis and gluconeogenesis. RuBisCO enzymes are chracterised as enzymes with slow reaction rates with a kcat of approximately 20. Furthermore they catalyse a side reaction with oxygen instead of of carbon dioxide, deteriorating the catalytic efficiency. The inclusion of the RuBisCO in a carboxysome, would significantly improve the efficiency of carbon fixation.
It was our approach to enable carbon fixation in E. coli for generating an autotrophic organism. Implemention of the calvin cycle in the heterotrophic model organism E. coli should be associated by expression of the carboxysome, to generate a higher efficiency.
Figure1: Pathway of the D-xylose consumption in E. coli for hte fixation of carbon dioxide by the RuBisCO from Halothiobacillus neapolitnaus. For this approach the substrate ribulose 1,5-bisphosphate needs to be accumulated in the cell. This is realzied be the PrkA from Snyechoccous elongatus.
Thin Layer Chromatography
Cultivation
Bild Carbonat-Gleichgewicht
Bild Reaktor Schema
Bild Reaktor
Kalbriergerade
Kultivierung
