3D model (JSmol)
|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)|
|834 g/1 L (25 °C (77 °F))|
|NFPA 704 (fire diamond)|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
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.
Use in biologyEdit
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.
Use in foodsEdit
- The D/L nomenclature does not refer to the molecule's optical rotation properties but to its structural analogy to glyceraldehyde.
- Weast, Robert C., ed. (1981). CRC Handbook of Chemistry and Physics (62nd ed.). Boca Raton, FL: CRC Press. p. C-110. ISBN 0-8493-0462-8.
- Holtzapple, M.T. (2003). HEMICELLULOSES. Encyclopedia of Food Sciences and Nutrition. pp. 3060–3071. doi:10.1016/B0-12-227055-X/00589-7. ISBN 9780122270550.
- Watson, James (2003). Molecular Biology of the Gene. p. 503.
- Braun, Géza (1940). "D-Arabinose". Organic Syntheses. 20: 14.; Collective Volume, 3, p. 101
- Merriam Webster Dictionary
- Guzman LM, Belin D, Carson MJ, Beckwith J (July 1995). "Tight regulation, modulation, and high-level expression by vectors containing the arabinose PBAD promoter". J. Bacteriol. 177 (14): 4121–30. CiteSeerX 10.1.1.629.9409. doi:10.1128/jb.177.14.4121-4130.1995. PMC 177145. PMID 7608087.
- Krog-Mikkelsen, Inger; Hels, Ole; Tetens, Inge; Holst, Jens Juul; Andersen, Jens Rikardt; Bukhave, Klaus (2011-08-01). "The effects of L-arabinose on intestinal sucrase activity: dose-response studies in vitro and in humans". The American Journal of Clinical Nutrition. 94 (2): 472–478. doi:10.3945/ajcn.111.014225. ISSN 1938-3207. PMID 21677059.