External ID: HMS1262

Protocol: NEC is stored at -80 degrees at a concentration of 15mg/ml in single use aliquots.

On the day of the screen, 20ul of purified NEC is aliquoted using a Multidrop Combi reagent dispenser into 384 well plates (Corning 3824). 100nl of compound dissolved in DMSO was transferred to each well of the assay plated via pin transfer. The plates (NEC + compound) are incubated at room temperature for 3 hours. Acceptor and donor reagents (CisBio 620/665 pair) are combined then added to each well at 5 microL volumes at a concentration of 8 nM and 80nM respectively. The plates are spun at 1k rpm for 1 min and incubated overnight at 4 degrees, then for one hour the subsequent day at room temperature.

Flourescent measurements are read on the Envision 1 plate reader at ICCB-L. The raw data consists of two fluorescence readings - at 665 nm and 620 nm for the acceptor and donor respectively.

Comment: Data analysis:
The raw data consists of two fluorescence readings - at 665 and 620 nm for the acceptor and donor respectively. The data is processed as a ratio of the emission from the acceptor over the donor (homogeneous time resolved fluorescence ratio). Normalized percent inhibition (NPI) for all experimental wells is calculated based on plate averages for negative and positive control HTRF ratio. Positives are scored as any ratio with a 50% or greater inhibition as compared with the positive control (i.e. NEC + Untagged UL50). To be considered a hit, both replicates need to score as positive. Activity scores are derived from NPI, with 100 = 100% inhibition (> 100% set to 100) and 0 = no inhibition (< 0% set to 0). Note that some compounds with NPI <50% (activity scores < 50) are classified as potential hits based on additional criteria (typically by selecting wells with low ratios compared to other experimental wells on the plate).

External ID: CHEMBL3069174

Protocol: N/A

Comment: Compounds with activity <= 10uM or explicitly reported as active by ChEMBL are flagged as active in this PubChem assay presentation.

Journal: Med Chem Res
Year: 2013
Volume: 22
Issue: 7
First Page: 3126
Last Page: 3133
DOI: 10.1007/s00044-012-0285-6

Target ChEMBL ID: CHEMBL235
ChEMBL Target Name: Peroxisome proliferator-activated receptor gamma
ChEMBL Target Type: SINGLE PROTEIN - Target is a single protein chain
Relationship Type: D - Direct protein target assigned
Confidence: Direct single protein target assigned

External ID: CHEMBL3069173

Protocol: N/A

Comment: Compounds with activity <= 10uM or explicitly reported as active by ChEMBL are flagged as active in this PubChem assay presentation.

Journal: Med Chem Res
Year: 2013
Volume: 22
Issue: 7
First Page: 3126
Last Page: 3133
DOI: 10.1007/s00044-012-0285-6

Target ChEMBL ID: CHEMBL3979
ChEMBL Target Name: Peroxisome proliferator-activated receptor delta
ChEMBL Target Type: SINGLE PROTEIN - Target is a single protein chain
Relationship Type: D - Direct protein target assigned
Confidence: Direct single protein target assigned

External ID: HMS791

Protocol: Prior to screening, FITC LANA1-23 was stored lyophilized at -80 degC and freshly purified chicken nucleosomes were stored at 4 degC in 20 mM Tris pH 7.5, 600 mM NaCl, 0.2 mM EDTA, 0.5 mM B-Mercaptoethanol.

On the day of screening, FITC LANA1-23 was resuspended at 50 uM in TEN-BT buffer (10 mM Tris-HCl (pH 7.5), 1 mM EDTA (pH 8.0), 2.5 mM NaCl, 5 mM Beta-mercaptoethanol, 0.01% Triton-X-100) and diluted to a final concentration of 50 nM in TEN-BT buffer plus 240 nM of purified nucleosomes (480 nM LANA peptide binding sites). 30 uL per well were dispensed in column 1-22 in Corning #3575 black 384 well plates.

Wells in column 23 contained 30 uL of the same mixture (for pilot screen) or with the addition of 10 uM monensin (for HTS) as a negative control. In column 24, 1250 nM unlabeled WT LANA1-23 peptide (for pilot screen) or 10 uM mitoxantrone (for HTS) was added to the wells as a positive control. Compounds were transferred into wells via stainless steel pin array (100 nL) and the reaction was incubated at room temperature for 10 to 45 minutes (stable for up to 2 hours). Library plates were screened in duplicate, with both assay plates in a given set prepared on the same day.

Following a room temperature incubation of 10 to 45 minutes, the assay is read on a EnVision plate reader using a 480 nM excitation filter, 535 nM S and P emission filters and D505fp/D535 dichoric mirror. mP value for FP measurement = 1000*(S-G*P)/(S+G*P) where S= , P=, G= G-factor. The G Factor = 1.

Comment: LANA 1-23 peptide containing the first 23 amino acids of the LANA protein from Kaposi's sarcoma herpesvirus (KSHV) was synthesized with an N-terminal FITC via a beta alanine linker and HPLC purified (peptide sequence: [FITC]-Beta alanine-MAPPGMRLRSGRSTGAPLTRGSC-[NH2]).

Data analysis: Z-scores were calculated for each replicate well using the mean and standard deviation of plate experimental well FP values. Compounds were considered active if the Z-score for both replicates < -2. Wells with high total fluorescence intensity (high S and P channel values) were excluded from further consideration. Activity scores were calculated based on replicate average FP Z-scores. For wells with average Z-score >= 0, the activity score was set to 0. For wells with replicate average Z-score < 0, replicate Z-score was divided by 4 and multiplied by -100. The replicate average was then used to determine the well activity score. Values > 100 (replicate average Z-score < -4) were set to 100.

External ID: CHEMBL3069175

Protocol: N/A

Comment: Compounds with activity <= 10uM or explicitly reported as active by ChEMBL are flagged as active in this PubChem assay presentation.

Journal: Med Chem Res
Year: 2013
Volume: 22
Issue: 7
First Page: 3126
Last Page: 3133
DOI: 10.1007/s00044-012-0285-6

Target ChEMBL ID: CHEMBL239
ChEMBL Target Name: Peroxisome proliferator-activated receptor alpha
ChEMBL Target Type: SINGLE PROTEIN - Target is a single protein chain
Relationship Type: D - Direct protein target assigned
Confidence: Direct single protein target assigned

External ID: PolK100

Protocol: Three microliters of reagents (buffer in column 3 and 4 as negative control and 10 nM Pol kappa in columns 1, 2, and 5-48) were dispensed into a 1536-well black solid-bottom plate. Compounds (23 nL) were transferred via Kalypsys pin tool equipped with 1536-pin array. The plates were then incubated for 15 min at room temperature, and 1 uL substrate (50 nM final concentration) were then added to start the reaction and kinetically read twice at 0 min and 10 min on the Viewlux reader

Comment: Compound Ranking:

1. Compounds are first classified as having full titration curves, partial modulation, partial curve (weaker actives), single point activity (at highest concentration only), or inactive. See data field "Curve Description". For this assay, apparent inhibitors are ranked higher than compounds that showed apparent activation.
2. For all inactive compounds, PUBCHEM_ACTIVITY_SCORE is 0. For all active compounds, a score range was given for each curve class type given above. Active compounds have PUBCHEM_ACTIVITY_SCORE between 40 and 100. Inconclusive compounds have PUBCHEM_ACTIVITY_SCORE between 1 and 39. Fit_LogAC50 was used for determining relative score and was scaled to each curve class' score range.

External ID: CHEMBL995690

Protocol: N/A

Comment: Journal: J. Nat. Prod.
Year: 1998
Volume: 61
Issue: 11
First Page: 1352
Last Page: 1355
DOI: 10.1021/np980117p

External ID: CHEMBL995691

Protocol: N/A

Comment: Journal: J. Nat. Prod.
Year: 1998
Volume: 61
Issue: 11
First Page: 1352
Last Page: 1355
DOI: 10.1021/np980117p

Target ChEMBL ID: CHEMBL2095194
ChEMBL Target Name: Coagulation factor VII/tissue factor
ChEMBL Target Type: PROTEIN COMPLEX - Target is a defined protein complex, consisting of multiple subunits
Relationship Type: D - Direct protein target assigned
Confidence: Direct protein complex subunits assigned

External ID: GPR151_PHUNTER_AG_LUMI_1536_1X%ACT

Protocol: Assay Overview:
TThe goal of this NIH sponsored research project was to identify GPR151 agonists via high-throughput screening (HTS) efforts. In brief, the McDonald Lab transferred the GPR151 AG 384wpf assay to Scripps for implementation and miniaturization to 1,536-well format followed by screening against the Scripps Drug Discovery Library (SDDL). A counterscreen assay, employing GPR119 cells, was also implemented by Scripps to identify compounds that non-specifically affect the PathHunter detection method. This project was aided by cheminformatic efforts to help identify compounds that demonstrated authentic agonist pharmacology and non-promiscuous activity profiles across other primary screens run against the SDDL. At completion of the project, several compounds demonstrated activity in the GPR151 AG PathHunter assay. All compounds selected for titration were also subjected to LC-MS analysis to confirm mass and sample purity

Protocol Summary:
Prior to the start of the assay, cells were resuspended in growth media at 2000cells/well in 1536 well plates. This was followed by an incubation of 18 hours at 37C+5%CO2. Then 1uL of Opti-Mem added to all wells except high controls to which 3X EA reagentwas added to each of those wells (0.2X final in lysis buffer). Compounds were pinned at 11.20uM final concentration in 1.0% DMSO followed by a 90 minute incubation at 37C+5%CO2. At this stage 3uL of Promega Beta-Glo detection Buffer was added to all wells followed by a 1 hour incubation at room temperature. Finally the assay end point read was taken using the ViewLux imaging reader from PerkinElemer Lifesciences with a 5 second exposure. Raw assay data was imported into Scripps# corporate database and ascetrained for Z' greater than 0.5 in order to be processed futher.

The percent activation for each compound was calculated as follows:

Percent Response of compound= 100 * ((Test Well-Median Data Wells)/(Median High Control # Median Data Wells))
Where:
Test_Well is defined as wells containing GPR151 cells in the presence of test compound
High_Control represents wells containing GPR151 cells stimulated with 0.2X EA reagent
Low_Control is defined as wells containing GPR151 cells and DMSO
PubChem Activity Outcome and Score:
Standard Cutoff
The reported PubChem Activity Score has been normalized to 100% observed primary inhibition. Negative % inhibition values are reported as activity score zero.
The activity score range for active compounds is 100-1, for inactive 1-0.
List of Reagents:
GPR151 cells (supplied by Patricia McDonald)
Pen Strep (Invtirogen 15140)
FBS (Invtirogen 16140)
Hygromycin (Invtirogen 10687010)
Lysis buffer (CisBio 62CL2FDF)
EA Reagent (DiscoverX 30-411)
G418 (Gemini Bio 400-113)
Opti-MEM (Invtirogen 31985)
Trypsin (Invtirogen 15400054)
Beta Glo (Promega E4780)
1536-well plates (Greiner Bio-One, part 789173)

Comment: Due to the size of the Scripps Molecular Screening Center compound library, this assay have been run as multiple separate campaigns, each campaign testing a unique set of compounds. All data reported were normalized on a per-plate basis. Possible artifacts of this assay can include, but are not limited to: dust or lint located in or on wells of the microtiter plate, compounds that modulate well fluorescence. All test compound concentrations reported above and below are nominal; the specific test concentration(s) for a particular compound may vary based upon the actual sample provided by the Scripps Molecular Screening Center.

A mathematical algorithm was used to determine what we call the standard hit cut-off to identify active compounds. Two values were calculated: (1) the average percent activation of all compounds tested in the screen, and (2) three times their standard deviation. The sum of these two values was used as a cutoff parameter, i.e. any compound that exhibited greater percent activation than the cutoff parameter was declared active. Using this "Standard Cutoff" (= 4.91%) the primary assay yielded 6,756 active compounds ("hits")."

External ID: HMS1485

Protocol: Prior to screening, HeLa cells were transduced with a lentivirus carrying the vector PHAGE-N CMVt N-RIG3 p53(R273C) encoding constitutively expressed SGFP2 fused to histone 2B and mRuby-p53(R273C). Following transduction, the cells were selected using neomycin and fluorescent activated cell sorting. The day before the compound treatment, cells were plated (750 cells/well) in a final volume of 30 L/well of Dulbecco's modified Eagle's medium (DMEM) supplemented with 10% (v/v) fetal bovine serum using a Thermo Combi. Plates were spun for 45 s at 500 rpm and incubated overnight (~24 h) at 37 degrees C, 5% CO2.

On the day of the screening, 33 nL of each compound was transferred to assay wells via a custom pin-transfer workstation. Additionally, 33 nL of positive (Velcade 300 M) and negative (DMSO 100%) controls were transferred to each plate into the corresponding columns that did not contain experimental compounds. For every compound library plate, there were two daughter plates (A and B). Plates were stacked 5 high, covered with lids, and incubated at 37 degrees C for 24h and 48h.

Assay plates were read using an Acumen Laser Scanning Cytometer 24h and 48h after compound treatment, using the following settings: For SGFP2 (channel 2), the 488 nm laser was used, with 6 mW output, 600 voltage gain and sensitivity threshold at 1; and for mRuby (channel 3), the 561 nm laser was used, with 8 mW output, 600 voltage gain and sensitivity threshold at 1.

Comment: Total nuclei and %p53 positive was calculated for all wells at 24 and 48h using the Cellista software. Percentage of p53 positive cells values were normalized to the positive and negative controls to determine a normalized percent of p53 activation. This was done on a per plate basis. The proteasome inhibitor Velcade (Adipogen, AG-CR1-3602-M005) at 330 nM was used as positive control while only the vehicle (DMSO, Sigma, D8418, 0.1% final concentration) was used as negative control. From these values the following normalized values were calculated (for both 24h and 48h): Normalized total nuclei = (total nuclei in experimental well / plate average negative control total nuclei) * 100. Normalized %p53 positive = (%p53 positive in experimental well - plate average negative control %p53 positive cells) / (plate average positive control %p53 positive cells - plate average negative control %p53 positive cells) * 100.

Based on the normalized percent p53 positive values, a compound was considered active when replicate average normalized % p53 positive cells > 50% for either or both time points. Activity scores were based on the replicate average normalized %p53 positive cells at 24hr. Values less than 0 were set to 0, and values > 100 were set to 100 (100% activity). Compounds with an activity score > 50 were considered active; some compounds were scored active despite having an activity score < 50 since % p53 positive cells was > 50% only at 48hr.

The average normalized total nuclei values were categorized as:
Very Low: x < 25%
Low: 25% < X > 50%
Medium: 50% < X > 75%
High: x < 75%

The average normalized % of p53 positive cells values were categorized as:
Low: x < 25%
Medium: 25% < X > 50%
Strong: 50% < X > 75%
Very Strong: x < 75%

Compounds that scored as strong or very strong in this classification (at either time point) were selected for follow up.

External ID: VANDERBILT_HTS_GIRK2_MPD

Protocol: To screen for modulators of the G protein-gated inwardly-rectifying potassium channel subunit 2 (GIRK2) homomeric channels, HEK293 cells were engineered to overexpress GIRK2. These cells were screened using a high-throughput thallium-flux assay in a 384-well format. High-throughput thallium flux assays are based on three principles: (1) extracellular thallium can permeate through potassium channels into cells, (2) the fluorescent dye Thallos enters and stays in the cytoplasm of HEK293 cells, and (3) the fluorescence of Thallos increases dramatically when it interacts with thallium ions. Compounds that modulate the activity of an overexpressed channel, in this case GIRK2, are identified by the change in fluorescence that results from changes in thallium influx into cells through the overexpressed channel.

The screening protocol was conducted as follows. One hour prior to screening, cells were loaded with 1.5 micromolar (muM) Thallos in assay buffer (1x Hank's Balanced Salt Solution and 20 millimolar (mM) HEPES). The liquid handling and imaging was conducted using a kinetic-imaging plate reader, Panoptic (WaveFront Biosciences). Before screening, Thallos-containing buffer was removed from cells and replaced with 20 microliters (muL) per well of assay buffer. Compounds were dissolved in assay buffer at 20 muM. After 8 seconds of imaging, 20 muL of compound solution was added per well and allowed to incubate for 150 seconds. Next, 10 muL of a solution containing 2.0 mM thallium in Base Buffer (125 mM NaHCO3, 1 mM MgSO4, 1.8 mM CaSO4, 5mM Glucose, and 20 mM HEPES) was added to the wells. 30 seconds later, 12 muL of base buffer containing 2.0 mM thallium and 50 mM 2-methyl-2,4-pentanediol (MPD), a partially-activating concentration, was added to each well. MPD has is a previously-described GIRK2 channel activator. Data was collected for 60 seconds after this final addition. The positive control for this screen was 30 muM ivermectin, a natural product previously identified as a GIRK2 activator as part of a small-scale pilot screen. Microsoft Excel was utilized for data analysis. Data were normalized, F/Fo, on a well-to-well basis to account for differences in cell number. Compound activity was analyzed by comparing the sums of control-subtracted amplitudes of fluorescence intensity at 20 seconds after each thallium addition. The top 0.2% compounds corresponding to wells that demonstrated the largest increases in fluorescence were selected as "hits" for counter screening, as described below.

All 63,228 compounds screened using the method described above are listed in column OUTCOME_SCREEN_HITS. The 133 compounds selected as hits based on the above criteria are labelled with "100" in the ACTIVITY column. Fluorescent compounds were included in the inactive compounds and marked with "0" in the ACTIVITY column.

The 133 active compounds from column OUTCOME_SCREEN_HITS were tested for non-specific activity in untransfected HEK293 cells using assay conditions otherwise identical to the primary screen. Column OUTCOME_HEK_COUNTERSCREEN lists the 23 compounds that displayed an increase in fluorescence upon thallium addition with "100" in the ACTIVITY column.

The 110 compounds which were identified as hits in the primary screen but inactive when tested in untransfected HEK293 cells were tested for activity in GIRK2-overexpressing HEK293 cells that did not express NPY4 receptor. Column OUTCOME_GIRK2_COUNTERSCREEN lists the 44 compound that displayed an increase in fluorescence upon thallium addition with "100" in the ACTIVITY column.

The 44 active compounds from column OUTCOME_GIRK2_COUNTERSCREEN were tested at various concentrations to determine if compound activity was concentration dependent. Column OUTCOME_GIRK2_DOSE_RESPONSE provides the efficacy of these compounds; activity of all compounds at the provided concentrations was normalized to the activity of VU0537695 at 25 muM, which was the highest efficacy observed during this screening. For each compound concentration listed, the efficacy of that compound provided refers to the normalized, control-subtracted fluorescence intensity at 15 seconds after the addition of thallium. The 28 compounds that demonstrated >5% efficacy and concentration-dependent activity were labelled as "100" in the ACTIVITY column.

Finally, column PUBCHEM_ACTIVITY_OUTCOME combines all of the information from the above counterscreens together, indicating the 28 hits from this GIRK2 screen.

Comment:

External ID: HMS750

Protocol: The stalled elongation complex used as a substrate in the screening assay was generated by pre-incubating 600 nM 3Dpol with 12 nM 5' fluorescein labeled 8-6 PETE RNA and 240 nM ATP for 30 minutes at room temperature in 50 mM HEPES, pH 7.0, 40 mM NaCl, 1.5 mM magnesium acetate, 60 microM ZnCl2, 4 mM DTT, and 0.1% Igepal detergent. This solution was dispensed into 384-well microplates (Corning 3710) at a volume of 25 microL/well. Experimental compounds were added by robotic pin transfer at 100 nL/well.

After an incubation time of ~60 min, the total fluorescence and fluorescence polarization signals from the labeled RNA were measured with Perkin Elmer EnVision microplate readers. This first reading provided data indicating whether compounds interfered with RNA binding to the stalled elongation complex. Polymerase elongation activity was then tested by adding 5 microL of a solution containing GTP, CTP, and UTP at 1.2 microM each, resulting in a final concentration of 200 nM for each of the four NTPs and 16.7 microg/ml for the compounds. This allowed for elongation to the end of the RNA template, and assay data were obtained with a second reading done after an incubation period of ~60 min, which is four times longer than the ~15 min needed for elongation under non-inhibited conditions.

Comment: Potential inhibitors were identified using a correlation plot combining standard Z-scores with an elongation efficiency measurement. A Z-score for each compound was calculated by the normal method of Z=(FPcompound-FPplate_mean)/StdDevplate_mean. An elongation efficiency value (FP %Elongation) was then calculated as E=(FPcompound-FPpositive)/(FPnegative-FPpositive), which reflects how the FP signal obtained in the presence of a compound compared to those of the unelongated positive controls (FPpositive) and fully elongated negative controls (FPnegative). Compounds that gave a FP signal greater than the starting material but less than the fully elongated controls thus had E values between 0% and 100%, while compounds that caused the RNA to dissociate from 3Dpol had negative E values due to the FP value associated with free RNA being lower than the unelongated FPpositive value. Finally, the elongation reaction also results in an increase in the total fluorescence intensity due to deprotonation of the fluorescein as it approaches the positively charged polymerase surface, providing an additional assessment of elongation. Compounds that resulted in total fluorescence %Elongation higher than that of the fully elongated control samples were rejected from the analysis. Positives were defined as having experimental FP Z-scores < -0.5 and FP %Elongation < 90%. Activity scores were calculated based on FP %Elongation. FP %Elongation <= 0 was scored as 100 for activity; FP %Elongation >= 100 was scored as 0 for activity. FP %Elongation values between 0 and 100 were subtracted from 100 to generate activity scores.

External ID: 2125-01_Inhibitor_SinglePoint_HTS_Activity

Protocol: Protocol:
PRC2 activity was measured using Dissociation-Enhanced Lanthanide Fluoro-ImmunoAssays (DELFIA) performed on 384-well, white, streptavidin-coated plates (PerkinElmer). In short, PRC2 was diluted to 30 ng and 3 ng per well in 20 uL 2X Enzyme Buffer (50mM Tris HCl pH 8.5, 10 mM DTT, 5 mM MgCl). Compounds were pinned at 100 nL per well and reactions were initiated with 20 uL of a 5 uM SAM (NEB) solution containing 600 nM H3[21-44]-GK-biotin (AnaSpec; PRC2).

Plates were incubated at room temperature for 1 hr and then washed three times with 100 uL of Wash Buffer (50mM Tris pH 7.4, 150 mM NaCl, 0.05% Tween 20, 0.2% BSA). 50 ul of Fluoroimmunoassay (FI) Buffer (50 mM Tris HCl pH 7.8, 150 mM NaCl, 0.05% Tween 40, 25 iM DTPA, 0.2% BSA, 0.05% BGG)containing a 1:4000 dilution of anti-H3K27me2 rabbit IgG (Cell Signaling, #9728) with 691 ng/mL Eu-N1-anti-rabbit IgG (PerkinElmer)was added to each well for PRC2 reactions.

Following 1 hr incubation at room temperature, the plates were washed three times with Wash Buffer and 50 uL of Enhancement Solution (PerkinElmer) was added to each well. Plates were incubated for 30 min at room temperature and time-resolved fluorescence (TRF) was measured on Wallac Envision 2104 Multilabel Reader (400 us window, 400 us delay, 320 excitation, 615 emission).

Comment: PRESENCE OF CONTROLS: Neutral control wells (NC) and positive control wells (PC) were included on every plate.

EXPECTED OUTCOME: Active compounds result in decreasing readout signal.

NORMALIZATION:
The raw signals of the plate wells were normalized using the 'Neutral Controls Minus Inhibitors' method in Genedata Assay Analyzer (v7.0.3):
The median raw signal of the intraplate neutral control wells was set to a normalized activity value of 0.
The median raw signal of the intraplate positive control wells was set to a normalized activity value of -100.
Experimental wells values were scaled to this range.
All well activities were then multiplied by -1 to create a positive activity readout value range, to match Pubchem convention.

PATTERN CORRECTION: No plate pattern correction algorithm from Genedata Condoseo (v.7.0.3) was applied.

PUBCHEM_ACTIVITY_SCORE:
This was set as equal to the mean of the normalized sample replicate activities, rounded to the nearest integer .
The minimum PUBCHEM_ACTIVITY_SCORE required for a compound to be called a hit (the activity threshold, or AT) was set at 50.

PERCENTAGE OF ACTIVE REPLICATES:
For each sample, the percentage of replicates (PCT_ACTIVE_REP) which had activity scores >= AT was determined.
The minimum percentage of replicates required for a compound to be called a hit (PAR_T) was set at 100.

PUBCHEM_ACTIVITY_OUTCOME:
Samples passing BOTH threshold criteria were assigned an outcome of 2 (active):
PUBCHEM_ACTIVITY_SCORE >= AT, and PCT_ACTIVE_REP >= PAR_T

Samples passing NEITHER threshold criteria were assigned an outcome of 1 (inactive):
PUBCHEM_ACTIVITY_SCORE < AT, and PCT_ACTIVE_REP < PAR_T

Samples passing AT only were assigned an outcome of 3 (inconclusive) :
PUBCHEM_ACTIVITY_SCORE >= AT, and PCT_ACTIVE_REP < PAR_T

Samples passing PAR_T only were assigned an outcome of 1 (inactive) :
PUBCHEM_ACTIVITY_SCORE < AT, and PCT_ACTIVE_REP >= PAR_T

External ID: HMS1482

Protocol: Prior to screening, cells were passaged in high glucose DMEM supplemented with 10% FBS, 1% P/S, 1 mM pyruvate, and HEPES. Media was changed every 1-2 days to prevent starvation and maintain cellular health.

On the day of screening, 384-well plates (Corning 3765) were filled with 30 uL of control cybrid cell suspension (33.3 cells/ul). Media for resuspension was DMEM supplemented with 10% FBS, 1% P/S, 1 mM pyruvate, and HEPES. Positive control columns were 23 and 24 for most plate setups. Initially, tunicamycin (15 nM) and galactose media (10 mM + 1 mM glucosamine) were used in columns 23 and 24, respectively. Over the course of the screen, galactose was substituted with Vidofludimus (11 uM). Next, 33 nL of each compound were pin-transferred to each plate in duplicate. Final assay well volume was 30 uL. Plates were stacked 2 high, covered with lids, and incubated at 37 degrees C for 2 days.

After 2 days of incubation, Hoescht (10 ul/well) was added to assay plates and fluorescence was read using the Acumen laser scanning cytometer. After, the bottom of plates were sealed with two layers of Brightmax Sealing Films. Then Promega NanoGlo Live cell reagent (20 ul/well) was added to each well and luminescence was read on a PerkinElmer EnVision plate reader after 5 minute of shaking.

Comment: Data analysis method and criteria for scoring active compounds:

Normalized luminescence values (luminescence / cell number) for each replicate were calculated (based on average of 2 luminescence reads per replicate). Z-scores were calculated using the plate average and standard deviation of experimental well normalized values. Each plate replicate was individually analyzed to measure reproducibility across plates. Z-scores were then averaged across replicates and a Z-score threshold of 1.96 was selected for positive hits, indicating increased mitochondrial supercomplex formation. Wells were excluded from further consideration based on low cell number (1 or both replicates with number of objects count < 1500). Activity scores were determined by scaling Z-scores from 0 (activity score = 0) to 4 (activity score = 100), with activity score > 50 being considered active. Z-scores < 0 were set to activity score = 0; Z-scores > 4 were set to activity score = 100 (100% activity).

External ID: CHEMBL4416547

Protocol: N/A

Comment: Journal: J Med Chem
Year: 2019
Volume: 62
Issue: 21
First Page: 9576
Last Page: 9592
DOI: 10.1021/acs.jmedchem.9b00994

Target ChEMBL ID: CHEMBL614632
ChEMBL Target Name: RBL-2H3
ChEMBL Target Type: CELL-LINE - Target is a specific cell-line
Relationship Type: N - Non-molecular target assigned
Confidence: Target assigned is non-molecular

External ID: MITF_INH_Alpha_1536_1X%INH PRUN

Protocol: Assay Overview:

The purpose of this biochemical assay is to identify MITF dimerization inhibitors that disrupt or prevent its homodimerization. This assay is a bead-based proximity assay, which employs acceptor beads and donor beads to generate a chemiluminescence signal. In this assay, Biotin-labelled MITF and His- tagged MITF homodimerization will bring donor and acceptor beads into close proximity. Laser excitation of the donor beads converts oxygen to an excited singlet state. Reaction of the singlet oxygen with the acceptor beads further activates a chemiluminescence reaction within the same bead resulting in emitted light at 520-620 nm. As designed, small molecule inhibitors that interfere with this interaction will increase the distance of the acceptor beads, thus leading to decreased signal. Compounds were tested in singlicate at a nominal test concentration of 2.6 micromolar.

Protocol Summary:
Prior to the start of the assay, 1.25#L of assay buffer (50mM HEPEs pH7.5, 250mM Sodium chloride, 0.1% Tween, 0.1% BSA) containing 10nM His-MITF_r259stop were dispensed into columns 1 thru column 2, and 1.25#L of assay buffer containing 10nM of His MBP MITF were dispensed into columns 3 thru column 48 of 1536 microtiter plates. Next, 10nL of test compounds in DMSO, 7,8-Dihydroxycoumarin (200#M final highest concentration) in DMSO, or DMSO alone (0.15% final concentration) were added to the appropriate wells before dispensing 1.25#L of 10#g/mL Acceptor beads into column 1 to 46 and 1.25#L of assay buffer into column 47 and 48. Plates were incubated in dark for 2hrs at room temperature. Then, dispenses of 1.25#L of 10nM Biotin-MITF into all columns, and 10#g/mL Donor beads into column 1 to 46 and 1.25#L of assay buffer into column 47 to 48 followed by 3hrs incubation in dark at RT, was done. Alphascreen signal was determined using an EnVision microplate reader (PerkinElmer, Waltham, MA) at 680nm excitation and 570nm emission.

The percent inhibition for each compound was calculated as follows:

100 *( ( Median_Low Control-Test Compound) / ( Median_Low Control - Median_High Control ) )

Where:

Test_Compound is defined as wells containing His-MITF + Biotin-MITF in the presence of test compound
High_Control is defined as wells containing His-MITF_r259stop + Biotin-MITF and DMSO.
Low_Control is defined as wells containing His-MITF + Biotin-MITF and DMSO

PubChem Activity Outcome and Score:

Standard Cutoff

The reported PubChem Activity Score has been normalized to 100% observed primary inhibition. Negative % inhibition values are reported as activity score zero.

The activity score range for active compounds is 100-1, for inactive 1-0.

List of Reagents:

His-tagged MITF protein (supplied by Min Guo)
His-tagged MITF_r259stop protein (supplied by Min Guo)
Biotinylated-MITF protein (supplied by Min Guo)
7,8-Dihydroxycoumarin (Sigma, part D5564)
HEPEs (Sigma, part H3375, H3784)
Sodium chloride (Fisher, part BP358-212)
Tween-20 (Fisher, part 50146671)
DMSO (Fisher, part D159)
BSA (Fisher, part BP1600-100)
AlphaScreen Beads Kit (Perkin Elmer, part 6760619L)
1536-well plates (Greiner Bio-One, part 789175)

Comment: Due to the size of the Scripps Molecular Screening Center compound library, this assay have been run as multiple separate campaigns, each campaign testing a unique set of compounds. All data reported were normalized on a per-plate basis. Possible artifacts of this assay can include, but are not limited to: dust or lint located in or on wells of the microtiter plate, compounds that modulate well fluorescence. All test compound concentrations reported above and below are nominal; the specific test concentration(s) for a particular compound may vary based upon the actual sample provided by the Scripps Molecular Screening Center.

External ID: VSVM-OFFLINE

Protocol: Two uL of HEK293 cell suspension are dispensed at 1000 cells/well into solid white 1536-well plates (Grenier) using a Multidrop Combi (Thermo Scientific). After addition of 23 nL compound by a pin tool (Kalypsys), the plate is incubated 1 h at 37 degrees C and then 3 uL of virus 1:100 dilution VSV-MARV is added. After 28 hr, 4 uL of assay reagent is added and the plates are read using a ViewLux (Perkin Elmer). Assays are performed in sub-saturating amounts of virus (MOI <0.5), therefore luciferase signals reflect the amount (titer) of virus able to infect the cells in presence of the compound.

Comment: Compound Ranking:

1. Compounds are first classified as having full titration curves, partial modulation, partial curve (weaker actives), single point activity (at highest concentration only), or inactive. See data field "Curve Description". For this assay, apparent inhibitors are ranked higher than compounds that showed apparent activation.
2. For all inactive compounds, PUBCHEM_ACTIVITY_SCORE is 0. For all active compounds, a score range was given for each curve class type given above. Active compounds have PUBCHEM_ACTIVITY_SCORE between 40 and 100. Inconclusive compounds have PUBCHEM_ACTIVITY_SCORE between 1 and 39. Fit_LogAC50 was used for determining relative score and was scaled to each curve class' score range.

External ID: VSVL-OFFLINE

Protocol: For screening, 1000 cells in 2 ul/well were dispensed into white solid 1536-well plates (Greiner) using a solenoid-based dispenser. Following transfer of 23nl compound or DMSO vehicle by a pin tool, 3 ul/well of VSV-LV was added. The plates were centrifuged 1 min at 1000 RPM and then incubated 16 hr at 37 C and 5% CO2. After addition of 4 ul/well SteadyLite (PerkinElmer) detection reagent, the plates were incubated 10 min at ambient temperature and luminescence was measured on a ViewLux (Perkin Elmer) plate reader.

Keywords: NIH Roadmap, MLPCN, MLI, MLSMR, qHTS, NCGC, Lassa virus, luciferase, cell assay, infection

Comment: Compound Ranking:

1. Compounds are first classified as having full titration curves, partial modulation, partial curve (weaker actives), single point activity (at highest concentration only), or inactive. See data field "Curve Description". For this assay, apparent inhibitors are ranked higher than compounds that showed apparent activation.
2. For all inactive compounds, PUBCHEM_ACTIVITY_SCORE is 0. For all active compounds, a score range was given for each curve class type given above. Active compounds have PUBCHEM_ACTIVITY_SCORE between 40 and 100. Inconclusive compounds have PUBCHEM_ACTIVITY_SCORE between 1 and 39. Fit_LogAC50 was used for determining relative score and was scaled to each curve class' score range.