Calvin cycle: Difference between revisions
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These reactions do not occur in the dark or at night. There is a light-dependent regulation of the cycle enzymes, as the third step requires NADPH. There are two regulation systems at work when the cycle must be turned on or off: the [[Thioredoxin|thioredoxin]]/[[Ferredoxin|ferredoxin]] activation system, which activates some of the cycle enzymes; and the [[RuBisCO]] enzyme activation, active in the Calvin cycle, which involves its own activase. | These reactions do not occur in the dark or at night. There is a light-dependent regulation of the cycle enzymes, as the third step requires NADPH. There are two regulation systems at work when the cycle must be turned on or off: the [[Thioredoxin|thioredoxin]]/[[Ferredoxin|ferredoxin]] activation system, which activates some of the cycle enzymes; and the [[RuBisCO]] enzyme activation, active in the Calvin cycle, which involves its own activase. | ||
The thioredoxin/ferredoxin system activates the enzymes glyceraldehyde-3- | The thioredoxin/ferredoxin system activates the enzymes [[Glyceraldehyde-3-Phosphate Dehydrogenase|glyceraldehyde-3-phosphate dehydrogenase]], glyceraldehyde-3-P phosphatase, fructose-1,6-bisphosphatase, sedoheptulose-1,7-bisphosphatase, and ribulose-5-phosphatase kinase, which are key points of the process. This happens when light is available, as the ferredoxin protein is reduced in the [[Photosystem I]] complex of the thylakoid electron chain when electrons are circulating through it. | ||
</StructureSection> | </StructureSection> | ||
== References == | == References == | ||
<references/> | <references/> | ||
