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Monosaccharide with five carbon atoms and a ketone functional group From Wikipedia, the free encyclopedia
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 the diastereomer of d-xylulose.
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Names | |||
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IUPAC name
d-erythro-Pent-2-ulose | |||
Systematic IUPAC name
(3R,4R)-1,3,4,5-Tetrahydroxypentan-2-one | |||
Other names
d-erythro-2-Pentulose Adonose Arabinulose Araboketose Ribosone | |||
Identifiers | |||
3D model (JSmol) |
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Properties | |||
C5H10O5 | |||
Molar mass | 150.130 g·mol−1 | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Ribulose sugars are composed in the pentose phosphate pathway from arabinose.[1] They are important in the formation of many bioactive substances. For example, d-ribulose is an intermediate in the fungal pathway for d-arabitol production. Also, as the 1,5-bisphosphate, d-ribulose combines with carbon dioxide at the start of the photosynthesis process in green plants (carbon dioxide trap).[2]
Ribulose has the same stereochemistry at carbons 3 and 4 as the five-carbon aldoses ribose and arabinose.
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