Heptose
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A heptose is a monosaccharide with seven carbon atoms.
They have either an aldehyde functional group in position 1 (aldoheptoses) or a ketone functional group in position 2 (ketoheptoses).
There are few examples of C-7 sugars in nature, among which are:
- Sedoheptulose or D-altro-heptulose (a ketose), an early intermediate in lipid A biosynthesis
- Mannoheptulose, found in avocados
- L-glycero-D-manno-heptose (an aldose), a late intermediate in lipid A biosynthesis.
Ketoheptoses have 4 chiral centers, whereas aldoheptoses have 5.
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