calvin cycle

[BodybldgDoc]

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In the C3 pathway, does the cycle start out with 6RUBP and 6CO2 or 3RUBP and 3CO2? i'm confused about the numbers. Also does it produce 1PGAL after 2 turns of the cycle or just 1 turn?

 

[dantheman2007]

Here is a summary of the Calvin Cycle-
The product of the cycle is a 3 carbon sugar (PGAL)
Cycle must occur 3 times to make a 3 carbo sugar
Cycle begins with CO2 added to RBP. - this produces a 6 carbon intermediate.
It splits into 2, 3-carbon molecules
These 3 carbon molecules are phosphorylated by ATP and reduced by NADPH to give glyceraldehyde 3- phosphate (PGAL)
2 PGAL are converted to glucose

In short,
In 6 turns of the cycle, 12 PGAL for 6 RBP and 1 molecule of glucose

Does this help?

Best,
dantheman2007

 

[BodybldgDoc]

Here is a summary of the Calvin Cycle-
The product of the cycle is a 3 carbon sugar (PGAL)
Cycle must occur 3 times to make a 3 carbo sugar
Cycle begins with CO2 added to RBP. - this produces a 6 carbon intermediate.
It splits into 2, 3-carbon molecules
These 3 carbon molecules are phosphorylated by ATP and reduced by NADPH to give glyceraldehyde 3- phosphate (PGAL)
2 PGAL are converted to glucose

In short,
In 6 turns of the cycle, 12 PGAL for 6 RBP and 1 molecule of glucose

Does this help?

Best,
dantheman2007

so 6 turns of the cycle can produce 12PGAL of which 2PGAL are used to make glucose and the remaining 10 PGAL are rearranged into 6 RUBP's? Is this correct.

 

[dantheman2007]

yes, that's exactly how I understand it.
sorry for the typo's
Best,
dantheman2007

 

[BodybldgDoc]

thanks dan. that really helped.