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BioAssay: AID 571757

Inhibition of human DNA polymerase beta

The exogenous control of hepatitis C virus (HCV) replication can be mediated through the inhibition of the RNA-dependent RNA polymerase (RdRp) activity of NS5B. Small-molecule inhibitors of NS5B include nucleoside and nonnucleoside analogs. Here, we report the discovery of a novel class of HCV polymerase nonnucleoside inhibitors, 1,5-benzodiazepines (1,5-BZDs), identified by high-throughput more ..
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 Tested Compounds
 Tested Compounds
All(2)
 
 
Unspecified(2)
 
 
 Tested Substances
 Tested Substances
All(2)
 
 
Unspecified(2)
 
 
 Related BioAssays
 Related BioAssays
AID: 571757
Data Source: ChEMBL (720297)
BioAssay Type: Confirmatory, Concentration-Response Relationship Observed
Depositor Category: Literature, Extracted
BioAssay Version:
Deposit Date: 2011-09-18
Modify Date: 2014-05-27

Data Table ( Complete ):           All
Target
Sequence: RecName: Full=DNA polymerase beta
Description ..   
Protein Family: Nucleotidyltransferase (NT) domain of family X DNA Polymerases
Comment ..   

Gene:POLB     Related Protein 3D Structures     More BioActivity Data..
Tested Compounds:
Description:
Title: 1,5-benzodiazepines, a novel class of hepatitis C virus polymerase nonnucleoside inhibitors.

Abstract: The exogenous control of hepatitis C virus (HCV) replication can be mediated through the inhibition of the RNA-dependent RNA polymerase (RdRp) activity of NS5B. Small-molecule inhibitors of NS5B include nucleoside and nonnucleoside analogs. Here, we report the discovery of a novel class of HCV polymerase nonnucleoside inhibitors, 1,5-benzodiazepines (1,5-BZDs), identified by high-throughput screening of a library of small molecules. A fluorescence-quenching assay and X-ray crystallography revealed that 1,5-BZD 4a bound stereospecifically to NS5B next to the catalytic site. When introduced into replicons, mutations known to confer resistance against chemotypes that bind at this site were detrimental to inhibition by 1,5-BZD 7a. Using a panel of enzyme isolates that covered genotypes 1 to 6, we showed that compound 4a inhibited genotype 1 only. In mechanistic studies, 4a was found to inhibit the RdRp activity of NS5B noncompetitively with GTP and to inhibit the formation of the first phosphodiester bond during the polymerization cycle. The specificity for the HCV target was evaluated by profiling the 1,5-BZDs against other viral and human polymerases, as well as BZD receptors.
(PMID: 18852280)
Categorized Comment
Assay Type: Binding

Assay Data Source: Scientific Literature

BAO: Assay Format: biochemical format

Target Type: Target is a single protein chain

Result Definitions
TIDNameDescriptionHistogramTypeUnit
OutcomeThe BioAssay activity outcomeOutcome
1IC50*IC50 PubChem standard valueFloatμM
2IC50 activity commentIC50 activity commentString
3IC50 standard flagIC50 standard flagInteger
4IC50 qualifierIC50 qualifierString
5IC50 published valueIC50 published valueFloatμM
6IC50 standard valueIC50 standard valueFloatnM

* Activity Concentration.

Data Table (Concise)
Classification
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