O-methylated flavonoid
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The O-methylated flavonoids or methoxyflavonoids are flavonoids with methylations on hydroxyl groups (methoxy bonds). O-methylation has an effect on the solubility of flavonoids.
Contents
Enzymes
O-methylated flavonoids formation implies the presence of specific O-methyltransferase (OMT) enzymes which accept a variety of substrates.[1] Those enzymes mediate the O-methylation on a specific hydroxyl group, like on 4' (example in Catharanthus roseus[2]) or 3' (example in rice[3]) positions. Those positions can be ortho, meta, para and there can be a special 3-O-methyltransferase for the 3-OH position. Calamondin orange (Citrus mitis) exhibits all of those activities.[4]
Plant enzymes
- Apigenin 4'-O-methyltransferase
- 8-hydroxyquercetin 8-O-methyltransferase
- Isoflavone 4'-O-methyltransferase
- Isoflavone 7-O-methyltransferase
- Isoliquiritigenin 2'-O-methyltransferase
- Isoorientin 3'-O-methyltransferase
- Kaempferol 4'-O-methyltransferase
- Luteolin O-methyltransferase
- Methylquercetagetin 6-O-methyltransferase
- 3-methylquercetin 7-O-methyltransferase
- Myricetin O-methyltransferase
- Quercetin 3-O-methyltransferase
- Vitexin 2"-O-rhamnoside 7-O-methyltransferase
Animal enzyme
O-methylated anthocyanidins
- 5-desoxy-malvidin
- capensinidin
- europinidin
- hirsutidin
- malvidin
- Peonidin
- Petunidin
- pulchellidin
- Rosinidin
.[5]
O-methylated flavanols
- Meciadanol (3-O'methyl catechin)
O-methylated flavanones
O-methylated flavanonols
O-methylated flavonols
of kaempferol
of myricetin
- Annulatin
- Combretol
- Europetin
- Laricitrin (3'-O-Dimethylmyricetin)
- 5-O-methylmyricetin
- Syringetin (3',5'-O-Dimethylmyricetin)
of quercetin
- Ayanin
- Azaleatin
- Isorhamnetin
- Ombuin
- Pachypodol
- Retusin (Quercetin-3,7,3',4'-tetramethyl ether)
- Rhamnazin
- Rhamnetin
- Tamarixetin
other
O-methylated flavones
O-methylated isoflavones
- Biochanin A
- Calycosin
- Formononetin
- Glycitein
- Irigenin
- 5-O-methylgenistein
- Pratensein
- Prunetin
- Psi-tectorigenin
- Retusin
- Tectorigenin
See also
References
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