Biology Question: G3P and Pyruvate


by Math Is Hard
Tags: biology, pyruvate
Math Is Hard
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#1
Mar25-06, 04:38 PM
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I am reading about the Calvin Cycle in Photosynthesis. My book says that the Calvin Cycle constructs a 3 carbon sugar called glyceraldehyde-3-phosphate (G3P) and then it says "You already met G3P in glycolysis. It is the three-carbon sugar formed by the splitting of glucose."

So I'm thinking, wait a minute, that's pyruvate. Are G3P and pyruvate two words for the same thing or is there a difference in the molecules?

Thanks!
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dumbadum
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Mar25-06, 08:59 PM
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G3P is not pyruvate
After glucose is mobolized by adding phosphate groups and turned into fructosebisphosphate, it is cleaved into dihydroxyacetone phosphate and phosphoglyceraldehyde. Then dihydroxyacetone phosphate is also converted into phosphoglyceraldehyde. The two phosphoglyceraldehyde is then converted to G3P. Through a series of chemical enzymes, G3P is converted into Pyruvate.
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Mar25-06, 10:05 PM
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Thanks very much! And it was very kind of you to provide me with the full explanation!


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