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BioAssay: AID 1677

Broad Institute MLPCN Streptokinase Expression Inhibition Project

The goal of the project is to identify and develop novel antibiotic small molecules through inhibiting streptokinase (SK) expression in group A streptococcus (GAS). Based on the critical role of SK in GAS pathogenicity, we are attempting to identify chemical compounds that specifically reduce the expression of bacterial SK, without interfering with bacterial viability. Specifically, a probe is a more ..
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 Tested Compounds
 Tested Compounds
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Probe(3)
 
 
Active(3)
 
 
 Tested Substances
 Tested Substances
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Probe(3)
 
 
Active(3)
 
 
AID: 1677
Data Source: Broad Institute (2014)
BioAssay Type: Summary, Candidate Probes/Leads with Supporting Evidence
Depositor Category: NIH Molecular Libraries Probe Production Network
BioAssay Version:
Deposit Date: 2009-04-13
Modify Date: 2011-03-04

Data Table ( Complete ):           Active    All
Target
Sequence: streptokinase A precursor [Streptococcus pyogenes M1 GAS]
Description ..   
Protein Family: Staphylokinase/Streptokinase family

Gene:SKA     Related Protein 3D Structures     More BioActivity Data..
BioActive Compounds: Chemical Probe: 3    Active: 3
Depositor Specified Assays
Show more
AIDNameTypeComment
1662MLPCN Streptokinase Expression Inhibitionscreening2014-01 - MLPCN Streptokinase Expression Inhibition
1900Luminescence Microorganism-Based Dose Confirmation HTS to Identify Compounds Cytotoxic to SK(-)GAS Group A StreptococcusconfirmatorySecondary Screen of 3225 compounds
1902Luminescence Microorganism-Based Dose Confirmation HTS to Identify Inhibitors of Streptokinase Promotor ActivityconfirmatoryDose Retest of 3227 compounds
1914Absorbance Microorganism-Based Dose Response HTS to Identify Inhibitors of Streptokinase ExpressionconfirmatorySecondary Screen of 3264 compounds
1915Luminescence Microorganism-Based Dose Response HTS to Identify Compounds Cytotoxic to StreptococcusconfirmatorySecondary Screen of 3264 compounds
2137Absorbance Microorganism-Based Dose Response Followup to Identify Inhibitors of Streptokinase ExpressionconfirmatorySecondary Screen of 63 compounds
2138Luminescence Microorganism-Based Dose Response Followup to Identify Compounds Cytotoxic to StreptococcusconfirmatorySecondary Screen of 63 compounds
2470Absorbance Microorganism-Based Dose Response Followup to Identify Inhibitors of Streptokinase Expression.confirmatorySecondary Screen of 14 compounds
2477Luminescence Microorganism-Based Dose Response Followup to Identify Compounds Cytotoxic to Streptococcus.confirmatorySecondary Screen of 14 compounds
504351Dose responses of compound inhibitions on streptokinase expression and effects on viability in Group A streptococci Measured in Microorganism System Using Plate Reader - 2014-03_Inhibitor_Dose_DryPowder_Activity_Set3confirmatory58 drypowder compounds at dose in SK Expression measuring activity set 3
504396Dose responses of compound inhibitions on streptokinase expression and effects on viability in Group A streptococci Measured in Microorganism System Using Plate Reader - 2014-03_Inhibitor_Dose_DryPowder_Viability_Set3confirmatory58 drypowder compounds at dose in SK Expression measuring viability set 3
Description:
Broad Institute of MIT and Harvard, Cambridge MA

NIH Molecular Libraries Probe Production Centers Network (MLPCN)
Grant Number 1R03DA026214-01

Internal Project ID: 2014

Keywords: Streptokinase, inhibition, growth, bacterial, group A streptococcus, virulence

Primary Collaborators:

Hongmin Sun, University of Missouri-Columbia, sunh@health.missouri.edu

Probes:
ML126, ML134, ML135

Project Overview:

The goal of the project is to identify and develop novel antibiotic small molecules through inhibiting streptokinase (SK) expression in group A streptococcus (GAS). Based on the critical role of SK in GAS pathogenicity, we are attempting to identify chemical compounds that specifically reduce the expression of bacterial SK, without interfering with bacterial viability. Specifically, a probe is a small molecule that shows no less than one hundred fold selection for the primary strain (SKKanGAS, see below) vs a control strain SK(-)GAS (see below) in growth-based assays and shows significant inhibition of SK secretion in abiochemical assay that measure SK activity. The more potent and specific probe will be used to further explore the role of SK in GAS pathogenicity.

Primary Assay Summary:

Internal Assay ID: 2014-01

Assay: The strain used for this project is a GAS strain carrying the kanamycin resistant gene under the control of the streptokinase promoter (SKKanGAS). Compounds that inhibit streptokinase promoter activity lead to a decrease of the kanamycin resistant gene product and cell death in the presence of kanamycin (Sigma K1637). Briefly, SKKanGAS at OD600 equal to 0.015 were plated onto 384-well plates (Corning 3570) and incubated with test compounds (7.5 uM, 0.2%DMSO) in the presence of 40 ug/ml of kanamycin in Todd-Hewitt Broth medium for 6 hours before cell survival is assessed by BacTiterGlo reagent (Promega G8233). Selectivity is determined by comparing growth inhibition between SKKanGAS and another GAS strain, SK(-)GAS where the kanamycin resistant gene is under the control of an SK-independent promoter.

Outcome: A decrease in the luminescent signal will identify compounds that either inhibit the SK promoter, or inhibit the cell growth independent of inhibiting the SK promoter. Normalization of the HTS data across runs and calibration to the positive control was performed as described below. The results are reported as % inhibition. Specificity for SK promoter inhibition will be determined in a secondary assay where a GAS strain carrying kanamycin resistant gene which is not controlled by the SK promoter will be used.

PubChem AID 1662

Number compounds evaluated: 303545

Active Compounds : Activity_Score >=50

Number of active compounds: 3959

Inconclusive Compounds: Activity_Score < 50 with at least one replicate activity score >=50.

Number of inconclusive compounds: 795


Dose Confirmation HTS - AID# 1900
Assay Biology/Type: Cell-Based (SK(-)GAS).
Readout Technology: Plate Reader/Luminescence.
Target Pathway: Streptokinase (SK) expression.
Test concentration(s): 6-point Dose Titration (0.06, 0.18, 0.56, 1.60, 5.00 and 15.00 microM).
Activity criterion: EC50 <= 1 log over the highest tested concentration.
Number of Substances evaluated: 3229
Number of Substances active: 2881


Dose Confirmation HTS - AID# 1902
Assay Biology/Type: Cell-Based (SKKanGAS).
Readout Technology: Plate Reader/Luminescence.
Target Pathway: Streptokinase (SK) expression.
Test concentration(s): 6-point Dose Titration (0.06, 0.18, 0.56, 1.60, 5.00 and 15.00 microM).
Activity criterion: EC50 <= 1 log over the highest tested concentration.
Number of Substances evaluated: 3227
Number of Substances active: 2946


Dose Confirmation HTS - AID# 1914
Assay Biology/Type: Cell-Based (GAS UMAA2166).
Readout Technology: Plate Reader/Luminescence.
Target Pathway: Streptokinase (SK) expression.
Test concentration(s): 6-point Dose Titration (0.06, 0.18, 0.56, 1.60, 5.00 and 15.00 microM).
Activity criterion: EC50 <= 1 log over the highest tested concentration.#
Number of Substances evaluated: 3266
Number of Substances active: 774


Dose Confirmation HTS - AID# 1915
Assay Biology/Type: Cell-Based (GAS UMAA2166).
Readout Technology: Plate Reader/Luminescence.
Target Pathway: Streptokinase (SK) expression.
Test concentration(s): 6-point Dose Titration (0.06, 0.18, 0.56, 1.60, 5.00 and 15.00 microM).
Activity criterion: EC50 <= 1 log over the highest tested concentration.
Number of Substances evaluated: 3266
Number of Substances active: 2220
Comment
The following compounds [SID] were purchased or synthesized for this project:
85281113 85281114 85281115 85281116 85281117 85281118 85281119 85281120 85281121 85281122 85281123 85281124 85281125 85281126 85281127 85281128 85281129 85281130 85281131 85281133 85281134 85281136 85281137 85281138 85281139 85281140 85281141 85281143 85281144 85281145 85281146 85281147 85281148 85281149 85281150 85281152 85281153 85281155 85281157 85281158 85281159 85281161 85281163 85281168 85281169 85281170 85281173 85281174 85281175 87334020 87334021 87334023 87334024 87334025 87334026 87334027 87334028 87334029 87334030 87334031 87334032 85281132 85281135 85281142 85281148 85281151 85281154 85281156 85281160 85281162 85281164 85281165 85281166 85281167 85281171 85281172
Result Definitions
TIDNameDescriptionHistogramTypeUnit
OutcomeThe BioAssay activity outcomeOutcome
ScoreThe BioAssay activity ranking scoreInteger
1ML_NUMML number assigned to compound.String
Additional Information
Grant Number: 1R03DA026214-01

Data Table (Concise)
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