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Chapter 15 (part 3)
Carbon Fixation (dark reactions)
Carbon Dioxide Fixation
Reductive Pentose Phosphate Cycle
6CO2+9ATP+5H20 9ADP+8Pi+6NADP++(DHAP or G3P)
Ribulose-1,5-Bisphosphate carboxylase/oxygenase
(rubisco)
Activation of Rubisco
Mg2+ plays role in binding and activating R 1,6-BP to accept
CO2
Rubisco Rxn Mechanisms
carboxylase
oxygenase
Reductive Pentose Phosphate Cycle
Reduction Stage
Phosphoglycerate kinase
Glyceraldehyde dehydrogenase
aldolase
F 1,6-bisphophatase
cytosol
Reductive Pentose Phosphate Cycle
Transketolases and Aldolases are used to make 5 carbon
sugars
Formation of 5 Carbon Sugars
F-6-P + 2 G3P + DHAP + 3 ATP 3 R-1,5-BP + 3 ADP
Regulation of RPP
Cycle
Thioredoxin
Oxygenase Activity of Rubisco
Photorespiration
C4 Photosynthesis
CAM Photosynthesis
stoma