Chapter 15 (part 3)

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Chapter 15 (part 3)

• Carbon Fixation (dark reactions)

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Carbon Dioxide Fixation
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Reductive Pentose Phosphate Cycle
6CO29ATP5H20 ? 9ADP8Pi6NADP(DHAP or G3P)
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Ribulose-1,5-Bisphosphate carboxylase/oxygenase
(rubisco)
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Activation of Rubisco
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Mg2 plays role in binding and activating R
1,6-BP to accept CO2
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Rubisco Rxn Mechanisms
carboxylase
oxygenase
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Reductive Pentose Phosphate Cycle
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Reduction Stage
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Reductive Pentose Phosphate Cycle
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Transketolases and Aldolases are used to make 5
carbon sugars
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Formation of 5 Carbon Sugars
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F-6-P 2 G3P DHAP 3 ATP ? 3 R-1,5-BP 3 ADP
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Regulation of RPP Cycle
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Thioredoxin
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Oxygenase Activity of Rubisco
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Photorespiration
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C4 Photosynthesis
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CAM Photosynthesis
stoma
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