Ribulose-1,5-bisphosphate

RubP2

Fixed

Sodium salt hydrate

Risk

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Ribulose -1 ,5 -bisphosphate (abbreviated RubP2 ), formerly also called ribulose -1 ,5 -diphosphate, is a sugar molecule ( monosaccharide ) with five carbon atoms, attached to the two phosphate residues. It plays as acceptor for carbon dioxide in the carbon dioxide assimilation in the Calvin cycle a large role in the dark reaction of photosynthesis.

The enzyme CO2 ,5 -bisphosphate binds to ribulose -1, is called ribulose -1 ,5 -bisphosphate carboxylase ( RuBisCO ) and plays a major role as a starting point for the Calvin cycle. After the CO2 fixation which decays by the addition of water become unstable molecule which then immediately after glucose further steps can be made in two 3- phosphoglycerate molecules. Subsequently regenerated from phosphoglycerate ribulose -1 ,5- bisphosphate.

In order to emphasize that the two phosphate radicals are connected at different locations with the sugar molecule, the notation bisphosphate has gained international acceptance instead of the previously used diphosphate.

Swell

• Jeremy M. Berg, John L. Tymoczko, Lubert Stryer (2007) Biochemistry. Oxford University Press, 6th edition, ISBN 3-8274-1800-3

• Toxic substance
• Monosaccharide
• Phosphoric acid esters