Biology:Zeaxanthin epoxidase
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Short description: Class of enzymes
| Zeaxanthin epoxidase | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Identifiers | |||||||||
| EC number | 1.14.13.90 | ||||||||
| CAS number | 149718-34-3 | ||||||||
| Databases | |||||||||
| IntEnz | IntEnz view | ||||||||
| BRENDA | BRENDA entry | ||||||||
| ExPASy | NiceZyme view | ||||||||
| KEGG | KEGG entry | ||||||||
| MetaCyc | metabolic pathway | ||||||||
| PRIAM | profile | ||||||||
| PDB structures | RCSB PDB PDBe PDBsum | ||||||||
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Zeaxanthin epoxidase (EC 1.14.13.90, Zea-epoxidase) is an enzyme with systematic name zeaxanthin,NAD(P)H:oxygen oxidoreductase.[1][2][3][4][5][6][7] This enzyme catalyses the following chemical reaction
- zeaxanthin + 2 NAD(P)H + 2 H+ + 2 O2 [math]\displaystyle{ \rightleftharpoons }[/math] violaxanthin + 2 NAD(P)+ + 2 H2O (overall reaction)
- (1a) zeaxanthin + NAD(P)H + H+ + O2 [math]\displaystyle{ \rightleftharpoons }[/math] antheraxanthin + NAD(P)+ + H2O
- (1b) antheraxanthin + NAD(P)H + H+ + O2 [math]\displaystyle{ \rightleftharpoons }[/math] violaxanthin + NAD(P)+ + H2O
Zeaxanthin epoxidase is a flavoprotein (FAD) that is active under conditions of low light.
References
- ↑ "FAD is a further essential cofactor of the NAD(P)H and O2-dependent zeaxanthin-epoxidase". FEBS Letters 376 (1–2): 45–8. November 1995. doi:10.1016/0014-5793(95)01243-9. PMID 8521963.
- ↑ "Xanthophyll cycle enzymes are members of the lipocalin family, the first identified from plants". The Journal of Biological Chemistry 273 (25): 15321–4. June 1998. doi:10.1074/jbc.273.25.15321. PMID 9624110.
- ↑ "Abscisic acid biosynthesis in tomato: regulation of zeaxanthin epoxidase and 9-cis-epoxycarotenoid dioxygenase mRNAs by light/dark cycles, water stress and abscisic acid". Plant Molecular Biology 42 (6): 833–45. April 2000. doi:10.1023/A:1006448428401. PMID 10890531.
- ↑ "Plant lipocalins: violaxanthin de-epoxidase and zeaxanthin epoxidase". Biochimica et Biophysica Acta (BBA) - Protein Structure and Molecular Enzymology 1482 (1–2): 84–91. October 2000. doi:10.1016/s0167-4838(00)00141-2. PMID 11058750.
- ↑ "The de-epoxidase and epoxidase reactions of Mantoniella squamata (Prasinophyceae) exhibit different substrate-specific reaction kinetics compared to spinach". Planta 213 (3): 446–56. July 2001. doi:10.1007/s004250100589. PMID 11506368.
- ↑ "Erratum Report. The de-epoxidase and epoxidase reactions of Mantoniella squamata (Prasinophyceae) exhibit different substrate-specific reaction kinetics compared to spinach". Planta 213 (3): 492. 2001. doi:10.1007/s004250100619.
- ↑ "Occurrence of the lutein-epoxide cycle in mistletoes of the Loranthaceae and Viscaceae". Planta 217 (6): 868–79. October 2003. doi:10.1007/s00425-003-1059-7. PMID 12844265.
External links
- Zeaxanthin+epoxidase at the US National Library of Medicine Medical Subject Headings (MeSH)
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