Where Do the Carbon Fixation Reactions Take Place in Prokaryotes?

Prokaryotes lack membrane-bound organelles. They lack chloroplasts. Photosynthetic pigments are present in the foldings of plasma membranes. They contain carboxysomes (bacterial microcompartment), which are the protein shells filled with enzyme RuBisCO. RuBisCO is the main enzyme of the carbon fixation process. It also contains carbonic anhydrase, which increases the concentration of CO2 around the enzyme RuBisCO and reduces the oxygenase activity.

Bacteria also have various alternate pathways for carbon fixation, e.g. reductive citric acid cycle.

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