Xylose isomerase
| xylose isomerase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
 | |||||||||
| Identifiers | |||||||||
| EC number | 5.3.1.5 | ||||||||
| CAS number | 9023-82-9 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
| Gene Ontology | AmiGO / EGO | ||||||||
| |||||||||
In enzymology, a xylose isomerase (EC 5.3.1.5) is an enzyme that catalyzes the chemical reaction
- D-xylose
D-xylulose
This enzyme belongs to the family of isomerases, specifically those intramolecular oxidoreductases interconverting aldoses and ketoses. The systematic name of this enzyme class is D-xylose aldose-ketose-isomerase. Other names in common use include D-xylose isomerase, D-xylose ketoisomerase, and D-xylose ketol-isomerase. This enzyme participates in pentose and glucuronate interconversions and fructose and mannose metabolism. The enzyme is used industrially to convert glucose to fructose in the manufacture of high-fructose corn syrup. It is sometimes referred to as "glucose isomerase".
Structural studies
Xylose isomerase enzymes exhibit a TIM barrel fold with the active site in the centre of the barrel and a tetrameric quaternary structure.[2] PDB structures are available in the links in the infobox to the right.
References
- ↑ Katz, A. K.; Li, X.; Carrell, H. L.; Hanson, B. L.; Langan, P.; Coates, L.; Schoenborn, B. P.; Glusker, J. P.; Bunick, G. J. (2006). "Locating active-site hydrogen atoms in D-xylose isomerase: Time-of-flight neutron diffraction". Proceedings of the National Academy of Sciences 103 (22): 8342–8347. doi:10.1073/pnas.0602598103. PMC 1482496. PMID 16707576.
- ↑ http://www.ebi.ac.uk/pdbe-srv/PDBeXplore/enzyme/?ec=5.3.1.5&tab=assemblies
- HOCHSTER RM, WATSON RW (1954). "Enzymatic isomerization of D-xylose to D-xylulose". Arch. Biochem. Biophys. 48 (1): 120–9. doi:10.1016/0003-9861(54)90313-6. PMID 13125579.
- Slein MW (1955). "Xylose isomerase from Pasteurella pestis, strain A-1122". J. Am. Chem. Soc. 77 (6): 1663–1667. doi:10.1021/ja01611a074.
- Yamanaka K (1968). "Purification, crystallization and properties of the D-xylose isomerase from Lactobacillus brevis". Biochim. Biophys. Acta. 151 (3): 670–80. PMID 5646045.