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BioAssay: AID 551520

Inhibition of rat liver cytosolic TrxR1 by spectrophotometry

Cytosolic (TrxR1) and mitochondrial (TrxR2) thioredoxin reductases experience pronounced concentration- and time-dependent inhibition when incubated with the two naphthodianthrones hypericin and pseudohypericin. Pseudohypericin turned out to be a quite strong inhibitor of TrxR1 (IC(50)=4.40muM) being far more effective than hypericin (IC(50)=157.08muM). In turn, the IC(50) values measured toward more ..
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 Tested Compounds
 Tested Compounds
All(13)
 
 
Active(1)
 
 
Unspecified(12)
 
 
 Tested Substances
 Tested Substances
All(13)
 
 
Active(1)
 
 
Unspecified(12)
 
 
AID: 551520
Data Source: ChEMBL (700048)
BioAssay Type: Confirmatory, Concentration-Response Relationship Observed
Depositor Category: Literature, Extracted
BioAssay Version:
Deposit Date: 2011-09-18
Modify Date: 2014-05-26

Data Table ( Complete ):           Active    All
Target
Sequence: RecName: Full=Thioredoxin reductase 1, cytoplasmic; Short=TR; AltName: Full=NADPH-dependent thioredoxin reductase; AltName: Full=Thioredoxin reductase TR1
Description ..   
Protein Family: Pyridine nucleotide-disulphide oxidoreductase, dimerization domain
Comment ..   

Gene:TXNRD1     Related Protein 3D Structures     More BioActivity Data..
BioActive Compound: 1
Description:
Title: Hypericins and thioredoxin reductase: Biochemical and docking studies disclose the molecular basis for effective inhibition by naphthodianthrones.

Abstract: Cytosolic (TrxR1) and mitochondrial (TrxR2) thioredoxin reductases experience pronounced concentration- and time-dependent inhibition when incubated with the two naphthodianthrones hypericin and pseudohypericin. Pseudohypericin turned out to be a quite strong inhibitor of TrxR1 (IC(50)=4.40muM) being far more effective than hypericin (IC(50)=157.08muM). In turn, the IC(50) values measured toward TrxR2 were 7.45muM for pseudohypericin and 43.12muM for hypericin. When compared to pseudohypericin, the inhibition caused by hypericin usually required significantly longer times, in particular on TrxR1. These important differences in the inhibitory potencies and profiles were analysed through a molecular modeling approach. Notably, both compounds were found to accommodate in the NADPH-binding pocket of the enzyme. The binding of the two naphthodianthrones to thioredoxin reductase seems to be particularly strong as the inhibitory effects were fully retained after gel filtration. Also, we found that TrxR inhibition by hypericin and pseudohypericin does not involve the active site selenol/thiol motif as confirmed by biochemical and modeling studies. The resulting inhibition pattern is very similar to that produced by the two naphthodianthrones on glutathione reductase. As the thioredoxin system is highly overexpressed in cancer cells, its inhibition by hypericin and pseudohypericin, natural compounds showing appreciable anticancer properties, might offer new clues on their mechanism of action and open interesting perspectives for future tumor therapies.
(PMID: 21106380)
Comment
Compounds with activity <= 50uM or explicitly reported as active by ChEMBL are flagged as active in this PubChem assay presentation.

Categorized Comment
Assay Type: Binding

Assay Data Source: Scientific Literature

Target Type: Target is a single protein chain

Result Definitions
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TIDNameDescriptionHistogramTypeUnit
OutcomeThe BioAssay activity outcomeOutcome
1IC50*IC50 PubChem standard valueFloatμM
3BEIBinding Efficiency Index(nM)Float
2SEISurface 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 valueFloat
10IC50 standard valueIC50 standard valueFloatnM
11IC50 data validityIC50 data validityString
12IC50 binding domainsIC50 binding domainsString
13IC50 activity commentIC50 activity commentString
14IC50 standard flagIC50 standard flagInteger
15IC50 qualifierIC50 qualifierString
16IC50 published valueIC50 published valueFloatμM
17IC50 standard valueIC50 standard valueFloatnM
18IC50 data validityIC50 data validityString
19IC50 binding domainsIC50 binding domainsString

* Activity Concentration.

Data Table (Concise)
Classification
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