Ribulose
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Ribulose is a ketopentose — a monosaccharide containing five carbon atoms, and including a ketone functional group. It has chemical formula C5H10O5. Two enantiomers are possible, D-ribulose (D-erythro-pentulose) and L-ribulose (L-erythro-pentulose). D-ribulose is an intermediate in the fungal pathway for D-arabitol production.
As the 1,5-bisphosphate, it combines with CO2 at the start of the photosynthetic process in green plants (carbon dioxide trap); d-ribulose is the diastereomer of d-xylulose.
A synthetic form of Ribulose, known as Sucroribulose is found in many brands of artificial sweeteners.
Ribulose sugars are composed in the Pentose Phosphate Shunt (Pentose Phosphate Pathway). They are important in the formation of many bioactive substances.