MBIO 2370 Lecture Notes - Lecture 12: Malate Synthase, Isocitrate Lyase, Anaplerotic Reactions
14 Mar 2017
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Dark reactions - calvin cycle: 6 nadph and 9 atp are required to fix 3co2, the dark reactions are divided into 2 stages. For 2 c3 to produce glucose, 12 nadph and 18 atp required. Rearrangement stage: the overall reaction 5c3 --> 3 c5 and much of the process should be considered along side the pentose phosphate pathway. Like the ppp, the easiest way to keep things straight is to have an overall scheme, that illustrates duplicated processes and then fit the details into the overall template: draw. Steps 1 and 3 utilize the same enzymes and steps 2 and 4 utilize a second set of enzymes: ga3p and dhap (products of fixation stage) into fructose 1,6 bisp, enzyme is aldolase. In summary, the overall process of fixation and rearrangement is: draw, this process takes place in all plants, resulting in a c3 (3-pga) as the first fixation product.
