Calvin cycle: Difference between revisions
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9) Finally, phosphoribulokinase (''e.g.'' [[Journal:Acta Cryst F:S2053230X19002693|Crystal structure of phosphoribulokinase from ''Synechococcus sp.'' strain PCC 6301]]) phosphorylates RuP into RuBP, <scene name='94/942630/Cv/1'>ribulose-1,5-bisphosphate</scene>, completing the Calvin cycle. This requires the input of one ATP. | 9) Finally, phosphoribulokinase (''e.g.'' [[Journal:Acta Cryst F:S2053230X19002693|Crystal structure of phosphoribulokinase from ''Synechococcus sp.'' strain PCC 6301]]) phosphorylates RuP into RuBP, <scene name='94/942630/Cv/1'>ribulose-1,5-bisphosphate</scene>, completing the Calvin cycle. This requires the input of one ATP. | ||
'''Light-dependent regulation''' | |||
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/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. | |||
</StructureSection> | </StructureSection> | ||
== References == | == References == | ||
<references/> | <references/> | ||
