Arabinose
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| Names | |
|---|---|
| IUPAC name
Arabinose
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| Other names
Pectinose
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| Identifiers | |
147-81-9  10323-20-3 (D)  5328-37-0 (L) |
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| ChEBI | CHEBI:46983 |
| ChemSpider | 59687 |
| EC Number | 205-699-8 |
| Jmol 3D model | Interactive image Interactive image |
| PubChem | 5460291 |
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| Properties[1] | |
| C5H10O5 | |
| Molar mass | 150.13 g/mol |
| Appearance | Colorless crystals as prisms or needles |
| Density | 1.585 g/cm3 (20 ºC) |
| Melting point | 164 to 165 °C (327 to 329 °F; 437 to 438 K) |
| Soluble | |
| Vapor pressure | {{{value}}} |
| Related compounds | |
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Related aldopentoses
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Ribose Xylose Lyxose |
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Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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 verify (what is ?) |
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| Infobox references | |
Arabinose is an aldopentose – a monosaccharide containing five carbon atoms, and including an aldehyde (CHO) functional group.
For biosynthetic reasons, most saccharides are almost always more abundant in nature as the "D"-form, or structurally analogous to D-glyceraldehyde.[note 1] However, L-arabinose is in fact more common than D-arabinose in nature and is found in nature as a component of biopolymers such as hemicellulose and pectin.
The L-arabinose operon, also known as the araBAD operon, has been the subject of much biomolecular research. The operon directs the catabolism of arabinose in E. coli, and it is dynamically activated in the presence of arabinose and the absence of glucose.[2]
A classic method for the organic synthesis of arabinose from glucose is the Wohl degradation.[3]
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D-Arabinose 
α-D-Arabinofuranose
β-D-Arabinofuranose
α-D-Arabinopyranose
β-D-Arabinopyranose
Contents
Etymology
Arabinose gets its name from gum arabic, from which it was first isolated.[4]
Use
In synthetic biology, arabinose is often used as a one-way or reversible switch for protein expression under the Pbad promoter in E. coli. This on-switch can be negated by the presence of glucose or reversed off by the addition of glucose in the culture medium which is a form of catabolite repression.[5]
Some organic acid tests check for the presence of arabinose, which may indicate overgrowth of intestinal yeast such as Candida albicans or other yeast/fungus species.
See also
Notes
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