lec13 - Lecture 13 The Calvin Cycle, or How to make Sugar...

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1 Lecture 13 The Calvin Cycle, or How to make Sugar from Sunshine
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2 The Whole Purpose: Use ATP and NADPH to reduce CO 2 Glyceraldehyde- 3-phosphate Calvin Cycle — Dark reactions (light- independent) Where did ATP and NADPH come from?
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3 Light Reactions Stroma e Thylakoid Lumen
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4 Starter Molecule Same molecule as in Pentose Phosphate Pathway Calvin cycle also called reductive Pentose Phosphate pathway 5C Ribulose-5- phosphate
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5 Pentose Phosphate Pathway
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6 Starter Molecule Same molecule as in Pentose Phosphate Pathway Calvin cycle also called reductive Pentose Phosphate pathway 5C Ribulose-5- phosphate Problem: Add CO how do you get back to 5 carbons to keep the cycle going? 2 — now 6 carbons —
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7 The Solution Ru-5-P (C5) Ru-5-P (C5) Ru-5-P (C5) + 3CO 2 GAP (C3) GAP (C3) GAP (C3) GAP (C3) GAP (C3) GAP (C3) Regenerate C5 C3 = Glyceraldehyde-3-phosphate C3* = Dihyroxyacetone phosphate C3 + C3* C6 C3* C3 C5 + C4 Aldolase Tranketolase Transketolase C7 C3 C5 + C5 Transaldolase + ++ Gluconeogenesis
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8 Gluconeogenesis Glycolysis
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9 1. Phosphorylate Ribulose-5-phosphate (5C) Phosphoribulokinase ATP phosphorylate Ru5P • Why? Generate 2 G3P, each has to have a Pi • Not in animals • For carbon arithmetic, 3 ATP
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This note was uploaded on 10/30/2010 for the course CHEM 114B taught by Professor Wang during the Winter '09 term at UCSD.

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lec13 - Lecture 13 The Calvin Cycle, or How to make Sugar...

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