Carbon Fixation: Difference between revisions

Latest revision as of 13:03, 6 February 2023

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Spinach RuBisCO 8 large and 8 small chains complex with substrate ribulose-1,5- bisphosphate, 1rcx

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 Organisms that grow by fixing carbon are called autotrophs, which include photoautotrophs (which use sunlight), and lithoautotrophs (which use inorganic oxidation).
-Seven autotrophic carbon fixation pathways are known.
+Several autotrophic carbon fixation pathways are known:
-'''Calvin cycle'''
+'''1) Calvin cycle'''
-CO<sub>2</sub> + 6 NADPH + 6 H<sup>+</sup> + 9 ATP + 5 H<sub>2</sub>O → glyceraldehyde-3-phosphate (G3P) + 6 NADP<sup>+</sup> + 9 ADP + 8 P<sub>i</sub>   (P<sub>i</sub> = inorganic phosphate)
+[[Calvin cycle]]
-''Step 1''
+'''2) Reverse Krebs cycle'''
-The enzyme [[RuBisCO]] catalyses the carboxylation of <scene name='94/942630/Cv/1'>ribulose-1,5-bisphosphate</scene>, RuBP, a 5-carbon compound, by carbon dioxide (a total of 6 carbons) in a two-step reaction.
+[[Reverse Krebs cycle]]
+'''3) Reductive acetyl CoA pathway'''
+[[Reductive acetyl CoA pathway]]
+'''4) 3-Hydroxypropionate bicycle'''
+[[3-Hydroxypropionate bicycle]]
 </StructureSection>
 == References ==
 <references/>