title: Inhibitory activity of flavonoids and tannins against HIV-1 protease.
abstract: Twenty-nine flavonoids and six hydrolyzable tannins were studied for their inhibitory activity against human immunodeficiency virus (HIV)-1 protease using fluorescence and HPLC assays. Among the flavonoids, flavones, flavanones, flavonols, catechols and chalcones, the flavonols were the most active category while flavanones and catechols displayed low activity. Quercetin was the most potent inhibitor of the target enzyme with an IC50 value of 58.8 microM, while butein and luteolin showed moderate activity. Of the hydrolyzable tannins tested, three ellagitannins which contain a hexahydroxvdiphenoyl (HHDP) unit linked to the O-3 and 0-6 positions of the sugar, were found to strongly inhibit HIV-1 protease. The IC50 values of corilagin and repandusinic acid on HIV-1 protease were 20.7 and 12.5 microM, respectively.
authors.affiliation: Department of Biology and Institute of Chinese Medicine, The Chinese University of Hong Kong.
authors.forename: H X
authors.initials: HX
authors.lastname: Xu
authors.forename: M
authors.initials: M
authors.lastname: Wan
authors.forename: H
authors.initials: H
authors.lastname: Dong
authors.forename: P P
authors.initials: PP
authors.lastname: But
authors.forename: L Y
authors.initials: LY
authors.lastname: Foo
mesh_terms: D005419:Flavonoids / Q000494:pharmacology*; D016333:HIV Protease / Q000187:drug effects*; D017320:HIV Protease Inhibitors / Q000494:pharmacology*; D013634:Tannins / Q000494:pharmacology*
chemical_list: D005419:Flavonoids; D017320:HIV Protease Inhibitors; D013634:Tannins; D016333:HIV Protease