BCHM 3P01 Lecture Notes - Gluconeogenesis, Ribose, Phosphoglycerate Kinase
20 May 2014
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Document Summary
3 rounds of the calvin cycle are needed to generate 3 rib-1,5-bp. 3 c02 are fixed during these 3 rounds. The fixed carbons ultimately allow for the generation of a 3c sugar (gap) In order to make a hexose sugar for starch synthesis you require 2 gaps, therefore 6 rounds of the calvin cycle must occur, regenerating 6 rib-1,5-bp and fixing 6 molecules of carbon dioxide. 6rib-1,5 bp +6c02 + 12 nadph + 18 atp + 12h2o 6rib-1,5 bp + 18pi +18 adp +12. If you radiolabel in the beginning you wouldn"t get the same carbons back. Molecule us consumed and then regenerated, so it"s not the same molecules. 10 are used to generate rib-1,5-bp and 2 are released as product to make starch: for every carbon dioxide fixed, 3atp are used. 2x 3pg 1,3-bpg and r-5-p r-1,5-bp: for every carbon dioxide fixed 2 nadph used. Fates of triose phosphates from the dark reactions.
