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BioAssay: AID 399340

Inhibition of xanthine oxidase assessed as decrease in uric acid production by spectrophotometry

The structure-activity relationship of flavonoids as inhibitors of xanthine oxidase and as scavengers of the superoxide radical, produced by the action of the enzyme xanthine oxidase, was investigated. The hydroxyl groups at C-5 and C-7 and the double bond between C-2 and C-3 were essential for a high inhibitory activity on xanthine oxidase. Flavones showed slightly higher inhibitory activity more ..
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 Tested Compounds
 Tested Compounds
All(33)
 
 
Active(16)
 
 
Unspecified(17)
 
 
 Tested Substances
 Tested Substances
All(34)
 
 
Active(16)
 
 
Unspecified(18)
 
 
 Related BioAssays
 Related BioAssays
AID: 399340
Data Source: ChEMBL (547369)
Depositor Category: Literature, Extracted
BioAssay Version:
Deposit Date: 2010-05-26
Modify Date: 2013-11-21

Data Table ( Complete ):           Active    All
BioActive Compounds: 16
Description:
Title: Structure-activity relationship and classification of flavonoids as inhibitors of xanthine oxidase and superoxide scavengers.

Abstract: The structure-activity relationship of flavonoids as inhibitors of xanthine oxidase and as scavengers of the superoxide radical, produced by the action of the enzyme xanthine oxidase, was investigated. The hydroxyl groups at C-5 and C-7 and the double bond between C-2 and C-3 were essential for a high inhibitory activity on xanthine oxidase. Flavones showed slightly higher inhibitory activity than flavonols. All flavonoid derivatives except isorhamnetin (30) were less active than the original compounds. For a high superoxide scavenging activity on the other hand, a hydroxyl group at C-3' in ring B and at C-3 were essential. According to their effect on xanthine oxidase and as superoxide scavengers, the flavonoids could be classified into six groups: superoxide scavengers without inhibitory activity on xanthine oxidase (category A), xanthine oxidase inhibitors without any additional superoxide scavenging activity (category B), xanthine oxidase inhibitors with an additional superoxide scavenging activity (category C), xanthine oxidase inhibitors with an additional pro-oxidant effect on the production of superoxide (category D), flavonoids with a marginal effect on xanthine oxidase but with a prooxidant effect on the production of superoxide (category E), and finally, flavonoids with no effect on xanthine oxidase or superoxide (category F).
(PMID: 9461655)
Comment
Compounds with activity <= 50uM or explicitly reported as active by ChEMBL are flagged as active in this PubChem assay presentation.

Putative Target:

ChEMBL Target ID: 149
Target Type: SINGLE PROTEIN
Pref Name: Xanthine dehydrogenase
Synonyms: Xanthine dehydrogenase;Xanthine dehydrogenase/oxidase;Xanthine oxidase;Xanthine oxidoreductase;XD;XO;XOR;
Gene Name: XDH;XDHA;
Protein Accession: P47989;
Protein GI: 2506326;
Organism: Homo sapiens
Tax ID: 9606
Target Classification: enzyme reductase
Confidence: Homologous single protein target assigned
Relationship Type: Homologous protein target assigned
Categorized Comment
ChEMBL Assay Type: Binding

ChEMBL Assay Data Source: Scientific Literature

Result Definitions
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TIDNameDescriptionHistogramTypeUnit
OutcomeThe BioAssay activity outcomeOutcome
1IC50*IC50 PubChem standard valueFloatμM
2BEIBinding Efficiency Index(nM)Float
3SEISurface Efficiency Index(nM)Float
4LELigand EfficiencyFloat
5LLELipophilic Ligand EfficiencyFloat
6IC50 activity commentIC50 activity commentString
7IC50 standard flagIC50 standard flagInteger
8IC50 qualifierIC50 qualifierString
9IC50 published valueIC50 published valueFloatμM
10IC50 standard valueIC50 standard valueFloatnM

* Activity Concentration.

Data Table (Concise)
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