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Calvin Cycle Paradox

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Calvin Cycle Paradox

Postby Tddorans » Thu Mar 25, 2010 5:44 am

So this may seem a tad simple of a question but I myself must know where everything goes to understand a process. So here is my dilemma which hopefully someone knows the answer:

The calvin cycle begins with the introduction of 3 Carbon Dioxide molecules but it onlt produces 1 Glyceraldehyde-3-Phosphate, which is a triose so therefore has the structure of C3H6O3, right? So the introduction of 3 CO2 has used the three carbon atoms and three oxygen atoms and I assume it has taken the 6 hydrogen from the NADPH when it was used to catalyse the reaction but we still have an excess of 3 oxygen molecules that haven't been used from the original input of 3 CO2 molecules. This is baffling me.... I can't see any place where they were synthesized as O2 or H2O and if they are recycled into the Clavin Cylce then eventually it would become saturated with oxygen.

Please help me figure this out.... I have searched the internet to only find they avoid this issue like it doesn't exist.


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Postby JackBean » Thu Mar 25, 2010 7:22 am

I think these oxygens go to the phosphates released from ATP during reduction of 3-phosphoglycerate to glyceraldehyde phosphate

Cis or trans? That's what matters.
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Postby jwalin » Fri Mar 26, 2010 8:02 am

i second what jackbean says... lol...
yes thats what happens
it isn't what you do that matters but it is how you do it
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