13 - Announcements This weeks homework that is due Friday...

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Announcements • This weeks homework that is due Friday is Ch. 18: 22, 23, 24. and Ch. 19: 1, 3, 4.
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2 Calvin Cycle: three stages 1. Fixation of CO 2 2. Reduction of 3- phospoglycerate to form hexose sugars 3. Regeneration of 1,5- bisphosphate
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6C 3C 5C 5C How to convert 6C and 3C to 5C (ribulose-1,5-bisphosphate)? 3 ? ?
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Stage 3: Regeneration of ribulose 1,5-bisphosphate 4 Coming back Full circle How do you think these epimerases/ isomerases might function?
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Net outcome step 3 (regeneration) • Fructose 6-phosphate + 2 glyceraldehyde 3-phosphate + dihydroxyacetone phosphate + 3ATP • 3 ribulose 1,5-bisphosphate + 3 ADP
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3 6 6 6 3 Calvin Cycle 6 5C 4C 7C 5C 5C 3C 3C 7C “gluconeogenesis” -like 5C 5C 3C 3C 3C
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3 6 6 6 3 Calvin Cycle: energy consumption to reduce 3 carbons 1GAP: 3 CO 2 9 ATP 6 NADPH 7
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What is the overall energy consumption to convert carbon dioxide to 6C unit?
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9 3 CO 2 1 Glyceraldehyde-3-phosphate (GAP) 9 ATP (3 Phosphoribulokinase, 6 Phosphoglycerate Kinase) 6 NADPH (GAP Dehydrogenase) ~ 15 ATP Fructose-6-phosphate Starch Sucrose ADP-glucose CDP-glucose UDP-glucose GDP-glucose Overall Process 1 GAP: 24 ATP 2 GAP: 48 ATP 1 ATP/photon, So ~48 photons to make sugar
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Storage of sugar in plant 10 •Starch: polymer of glucose •similar to glycogen, less branched •ADP-glucose is the activated precursor (UDP-glucose for glycogen synthesis) •Stored in chloroplasts •Sucrose: disaccharide •Synthesized in cytoplasm •No transporter for hexose phosphates •Transport triose phosphate intermediates (GAP) to cytoplasm •Sucrose is readily transportable and mobilizeable, stored in many plant cells, as in sugar beets, sugar cane
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Synthesis of sucrose 11
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This note was uploaded on 09/29/2010 for the course ECON 100A taught by Professor Smith during the Spring '08 term at Alabama.

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13 - Announcements This weeks homework that is due Friday...

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