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Ribulose 1,5-bisphosphate

ribulose-1 5-bisphosphate carboxylase, ribulose 1-5 bisphosphate
Ribulose 1,5-bisphosphate RuBP is an organic substance that is involved in photosynthesis It is a colourless anion, a double phosphate ester of the ketopentose ketone-containing sugar with five carbon atoms called ribulose Salts of RuBP can be isolated, but its crucial biological function happens in solution[1] To simplify the presentation, the image in the above table depicts the acid form of this anion

Role in photosynthesis

The Calvin cycle showing the role of ribulose-1,5-bisphosphate

The enzyme ribulose bisphosphate carboxylase oxygenase RuBisCO catalyzes the reaction between RuBP and carbon dioxide The product is the highly unstable six-carbon intermediate known as 3-keto-2-carboxyarabinitol 1,5-bisphosphate This six-carbon intermediate decays virtually instantaneously into two molecules of 3-phosphoglycerate 3-PGA see figure RuBisCO also catalyzes RuBP with oxygen O
2 in a process called photorespiration, a process that is more prevalent at high temperatures During photorespiration RuBP combines with O
2 to become 3-PGA + phosphoglycolic acid In the Calvin cycle, RuBP is a product of the phosphorylation of ribulose-5-phosphate by ATP

References

  1. ^ The topic is discussed in all biochemistry textbooks, this one is representative: Nelson, D L; Cox, M M "Lehninger, Principles of Biochemistry" 3rd Ed Worth Publishing: New York, 2000 ISBN 1-57259-153-6

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Ribulose 1,5-bisphosphate


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    29.10.2014


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