BIOC 3110 Lecture Notes - Lecture 23: Light-Independent Reactions, Sedoheptulose, Xylulose
21 Oct 2016
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Document Summary
What are the three stages in the calvin cycle and what happens in each step: 3 stages: Fixation-co2 + (5c) ribulose 1,5 bisphosphate 2- 3c phosphoglycerate. We take a 5c sugar and add carbon dioxide to it, forming 2 3c sugars using rubisco. Reduction- uses 2 atp+ 2 nadph to reduce 2 3c molecules into a 6c molecule. The 2 3c phosphoglycerates are phosphorylated by 2. Atp to make 1,3-bpg, and then 2 nadph dephosphorylates them to make a glyceraldehyde 3- phosphate and a dhap, which are in equilibrium. Those 3c sugars combine to form fructose-6-phosphate to add to the hexose monophosphate pool (can be used to make sucrose, starch, transport, etc) Complex made of 8 subunits-4 large, 4 small. Enzyme is located on stromal surface of thylakoid. Energetically favorable fixation of co2 during (cid:498)fixation(cid:499) phase. Ribulose 1,5 bisphosphate undergoes a series of reactions with the help of this enzyme.
