MetaCyc Compound Class: a flavonoid

Superclasses: an aromatic compound an organic aromatic compound a phenylpropanoid
an organic heterocyclic compound an organic heterobicyclic compound a benzopyran a 1-benzopyran a chromene

Flavonoids are a class of plant secondary metabolites. Their name is derived from the Latin word flavus meaning yellow, their colour in nature. In higher plants, flavonoids are involved in UV filtration, symbiotic nitrogen fixation and floral pigmentation. They are the most important plant pigments for flower coloration producing yellow or red/blue pigmentation.

The term flavonoids is very generic, and is used to describe any organic molecular entity whose stucture is based on derivatives of a phenyl-substituted 1-phenylpropane possessing a C15 or C16 skeleton, or such a structure condensed with a C6-C3 lignan precursors.

The following are three of the main classes of flavonoids, although many more exist:

Flavones, which are based on the backbone of flavone (2-phenylchromen-4-one)

Isoflavonoids, which are based on the backbone of 3-phenylchromen-4-one

Neoflavonoids, derived from 4-phenylcoumarine.

Child Classes: a 3'-hydroxy-flavonoid (19) , a 3'-methoxyflavonoid (2) , a 4'-methoxyflavonoid (0) , a 5'-methoxyflavonoid (0) , a chalcone (29) , a flavan (52) , a flavone (192) , a neoflavonoid (1) , a pterocarpan (13) , an anthocyanin (71) , an aurone (11) , an isoflavonoid (48)

(-)-sativan ,
(-)-vestitol ,
3',4',5'-O-trimethyltricetin ,
3',5'-O-dimethyltricetin ,

Unification Links: ChEBI:47916 , KEGG:C01579 , Wikipedia:Flavonoid

Reactions known to consume the compound:

Not in pathways:
a flavonoid + NADPH + oxygen + H+ → a 3'-hydroxy-flavonoid + NADP+ + H2O

Revised 29-Aug-2013 by Caspi R , SRI International


Ollis66: Ollis WD (1966). "The neoflavanoids, a new class of natural products." Experientia 22(12);777-83. PMID: 5973205

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Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
Page generated by SRI International Pathway Tools version 19.0 on Fri Mar 27, 2015, BIOCYC13B.