O-methylated flavonoid

O-methylated flavonoids formation implies the presence of specific O-methyltransferase (OMT) enzymes which accept a variety of substrates. Those enzymes mediate the O-methylation on a specific hydroxyl group, like on 4' (example in Catharanthus roseus) or 3' (example in rice) 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. 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 • Catechol-O-methyl transferase ==O-methylated anthocyanidins==

• 5-Desoxy-malvidin • Capensinidin • Europinidin • Hirsutidin • Malvidin • Peonidin • Petunidin • Pulchellidin • Rosinidin • ==O-methylated flavanols==

• Meciadanol (3-O'methyl catechin) ==O-methylated flavanones==

• Hesperetin • Homoeriodictyol • Isosakuranetin • Sakuranetin • Sterubin ==O-methylated flavanonols==

• Dihydrokaempferide ==O-methylated flavonols==

of kaempferol • Kaempferide 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 • Eupatolitin • Natsudaidain ==O-methylated flavones==

• Acacetin • Chrysoeriol • Diosmetin • Nepetin • Nobiletin • Oroxylin-A • Sinensetin • Tangeritin • Thevetiaflavone • Wogonin ==O-methylated isoflavones==

• Biochanin A • Calycosin • Formononetin • Glycitein • Irigenin • 5-O-methylgenistein • Pratensein • Prunetin • Psi-tectorigenin • Retusin • Tectorigenin ==See also==