Table 1 Inhibitory activity of 2′-hydroxyflavanone and other 13 flavonoids against AeNobo. Fifteen flavonoids, including the subclasses of flavonone, flavone, isoflavone, flavonol, isoflavan, and anthocyanidin, are illustrated in Additional file 1: Figure S3. “No inhibition” means that the IC50 value of a compound is greater than 25 μM. Among the examined chemicals, biochanin A is the only estrogenic chemical that inhibits the in vitro enzymatic activity of AeNobo. s.d. standard deviation, - not determined
Compound | Subclass | IC50 to AeNobo-WT (μM) (mean ± s.d.) | IC50 to AeNobo-E113A (μM) (mean ± s.d.) |
|---|---|---|---|
2′-Hydroxyflavanone | Flavanone | 4.76 ± 0.37 | No inhibition |
Naringenin | Flavanone | No inhibition | - |
Luteolin | Flavone | 3.99 ± 0.46 | 35.8 ± 5.73 |
Biochanin A | Isoflavone | 1.84 ± 0.06 | No inhibition |
Daidzein | Isoflavone | 3.87 ± 0.52 | No inhibition |
(+) Catechin hydrate | Flavonol | No inhibition | - |
Fisetin | Flavonol | 1.69 ± 0.04 | No inhibition |
Kaempferol | Flavonol | 4.91 ± 1.69 | No inhibition |
Myricetin | Flavonol | 2.91 ± 0.27 | No inhibition |
Quercetin | Flavonol | 0.963 ± 0.094 | No inhibition |
Tamarixetin | Flavonol | No inhibition | - |
S-equol | Isoflavan | No inhibition | - |
Cyanidin chloride | Anthocyanidin | 2.15 ± 0.24 | No inhibition |
Petunidin | Anthocyanidin | 14.9 ± 2.01 | No inhibition |