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Altrose is an aldohexose sugar. D-Altrose is an unnatural monosaccharide. It is soluble in water and practically insoluble in methanol. However, L-altrose has been isolated from strains of the bacterium ''
Butyrivibrio fibrisolvens
''Butyrivibrio'' is a genus of bacteria in Class Clostridia. Bacteria of this genus are common in the gastrointestinal systems of many animals. Genus ''Butyrivibrio'' was first described by Bryant and Small (1956) as anaerobic, butyric acid-pr ...
''.
Altrose is a C-3 epimer
In stereochemistry, an epimer is one of a pair of diastereomers. The two epimers have opposite configuration at only one stereogenic center out of at least two. All other stereogenic centers in the molecules are the same in each. Epimerization i ...
of mannose
Mannose is a sugar monomer of the aldohexose series of carbohydrates. It is a C-2 epimer of glucose. Mannose is important in human metabolism, especially in the glycosylation of certain proteins. Several congenital disorders of glycosylation ...
. The ring conformation of α-altropyranoside is flexible compared to most other aldohexopyranosides, with idose
Idose is a hexose, a six carbon monosaccharide. It has an aldehyde group and is an aldose. It is not found in nature, but its uronic acid, iduronic acid, is important. It is a component of dermatan sulfate and heparan sulfate, which are glycosam ...
as exception. In solution different derivatives of altrose have been shown to occupy both 4C1, OS2 and 1C4-conformations.
References
{{Carbohydrates Aldohexoses