C454_lect7_print - Lecture 7 - The Calvin Cycle and the...

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Chem 454: Regulatory Mechanisms in Biochemistry University of Wisconsin-Eau Claire Lecture 7 - The Calvin Cycle and the Pentose Phosphate Pathway 1 2 The Calvin cycle The dark reactions of photosynthesis in green plants Reduces carbon from CO2 to hexose (C6H12O6) Requires ATP for free energy and NADPH as a reducing agent. Introduction 2 3 NADH versus NADPH Introduction 3 4 The Pentose Phosphate Pathway Used in all organisms Glucose is oxidized and decarboxylated to produce reduced NADPH Used for the synthesis and degradation of pentoses Shares reactions with the Calvin cycle Introduction 4
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5 Source of carbon is CO2 Takes place in the stroma of the chloroplasts Comprises three stages Fixation of CO2 by ribulose 1,5-bisphosphate to form two 3-phosphoglycerate molecules Reduction of 3-phosphoglycerate to produce hexose sugars Regeneration of ribulose 1,5-bisphosphate 1. The Calvin Cycle 5 6 Three stages 1. Calvin Cycle 6 7 Incorporation of CO2 into 3-phosphoglycerate 1.1 Stage I: Fixation 7 8 Rubisco: Ribulose 1,5- bisphosphate carboxylase/ oxygenase 1.1 Stage I: Fixation 8
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This note was uploaded on 05/05/2011 for the course BIOL 400 taught by Professor Dr.biology during the Spring '11 term at University of Tennessee.

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C454_lect7_print - Lecture 7 - The Calvin Cycle and the...

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