EC Number | KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|---|
1.23.5.1 | 5.3 | - |
antheraxanthin | - |
Spinacia oleracea | |
1.23.5.1 | 11.1 | - |
violaxanthin | - |
Spinacia oleracea |
EC Number | Localization | Comment | Organism | GeneOntology No. | Textmining |
---|---|---|---|---|---|
1.23.5.1 | thylakoid | - |
Spinacia oleracea | 9579 | - |
EC Number | Organism | UniProt | Comment | Textmining |
---|---|---|---|---|
1.23.5.1 | Spinacia oleracea | - |
- |
- |
EC Number | Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|---|
1.23.5.1 | antheraxanthin + ascorbate | - |
Spinacia oleracea | zeaxanthin + dehydroascorbate + H2O | - |
? | |
1.23.5.1 | additional information | only the epoxy-oxygen at the 5,6(5',6') position of xanthophylls are cleaved by the VDE, whereas ring-spanning epoxides at position 3,6(3',6') are not accessible to the enzyme. The structure and chemical ligands of the second jonon ring are insignificant for the de-epoxidation of the 5,6-epoxy groups of the first ring. The epoxy-free second jonon ring is not involved in the binding of the xanthophyll to the catalytic center and does not affect the enzyme reaction. Due to steric hindrance, any tested cis-configuration in the polyene chain of the xanthophylls, as well as the 8-oxy group, in fucoxanthin, prevents the de-epoxidation | Spinacia oleracea | ? | - |
? | |
1.23.5.1 | violaxanthin + ascorbate | - |
Spinacia oleracea | antheraxanthin + dehydroascorbate + H2O | - |
? |