## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: pCHK1 Cellular Assay: Inhibitors of ATR kinase are effective at inhibiting the ATR-driven phosphorylation of the downstream target Chk1 kinase at Serine 345, following the addition of 4-nitroquinoline N-oxide, a chemical used to induce DNA damage. Cellular IC50 for the inhibitors of ATR described herein were measured in HT-29 colorectal adenocarcinoma cells. HT-29 cells were routinely maintained in McCoy's 5A media (ATCC Catalog #30-2007) supplemented with 10% fetal bovine serum (Sigma Catalog # F2442) and 1λ Penicillin-Streptomycin (Gibco Catalog #15140-122) using a humidified incubator (37° C., 5% CO2, and ambient O2). In preparation for the CHK1 (p-Ser345) ALPHASCREEN® SUREFIRE® assay, cells were harvested and resuspended in McCoy's 5A media supplemented with 10% fetal bovine serum and 1× Penicillin-Streptomycin. Cells were seeded onto a 384-well black CELLSTAR® Tissue Culture Plate (VWR Catalog #89085-314) at a density of 13,000 cells/well in a volume of 40 μL. The microplate was incubated overnight (approximately 20 hours) at 37° C. with 5% CO2 and ambient O2. Stock solutions of the test compounds were prepared in 100% DMSO (Sigma, Catalog # D2650) and serially diluted 1:3 using 100% DMSO. Compounds were additionally diluted 1:33 in culture medium, and 10 μL/well were transferred to the tissue culture plate. Following the compound addition the microplate was incubated at 37° C. for 90 minutes. 10 μL of 4-nitroquinoline N-oxide (Sigma Aldrich Catalog # N8141-1G) diluted in media (final concentration 12 uM) were added to the tissue culture plate followed by a 120 minute incubation at 37° C. The cells were then washed with PBS and lysed using 10 μL/well SUREFIRE® Kit lysis buffer diluted to 1× in water (PerkinElmer Catalog # TGRCHK1S50K), with mixing on an orbital shaker at 500 rpm for 20 min at RT. Lysates were frozen at −20° C. overnight.4 μL/well of lysate was then transferred from the tissue culture plate to a 384-well, white, low volume, PROXIPLATE (PerkinElmer Catalog #600828). 5 μL/well of the acceptor bead solution, prepared by diluting SUREFIRE® Kit activation buffer (PerkinElmer Catalog # TGRCHK1S50K) and ALPHASCREEN® Protein A acceptor beads (PerkinElmer Catalog #6760617R) in SUREFIRE® Kit reaction buffer (PerkinElmer Catalog # TGRCHK1S50K), were added to the lysates under subdued light and incubated at room temperature for 120 min. 2 uL/well of the donor bead solution, prepared by diluting ALPHASCREEN® Streptavidin donor beads (PerkinElmer Catalog #6760617R) in SUREFIRE® Kit dilution buffer (PerkinElmer Catalog # TGRCHK1S50K), were added under subdued light and incubated at room temperature for an addition 120 minutes. The pCHK1 ALPHASCREEN® signal was measured using an ENVISION® plate reader (PerkinElmer). IC50 values were calculated using a four-parameter logistic curve fit using Genedata Screener software.
- Assay organism: Homo sapiens
- Target name: Serine/threonine-protein kinase Chk1
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: C[C@@H]1COCCN1c1cc(N=S(C)(=O)C2CC2)nc(-n2cnc3ccccc32)n1
- Properties:
- ChEMBL ID: CHEMBL5885586
- Molecular weight: 412.52
- Heavy atoms: 29
- Hydrogen bond donors: 0
- Hydrogen bond acceptors: 7
- TPSA: 85.5
- LogP: 2.93
- Rotatable bonds: 4
- Ring count: 5
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.45
- QED: 0.65

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 7.34
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 46; units nM; pChEMBL 7.34; comment 964868

## Query Molecule B
- Canonical SMILES: CCc1nc2ccccc2n1-c1nc(N=S(C)(C)=O)cc(N2CCOC[C@H]2C)n1
- Properties:
- ChEMBL ID: CHEMBL6017748
- Molecular weight: 414.54
- Heavy atoms: 29
- Hydrogen bond donors: 0
- Hydrogen bond acceptors: 7
- TPSA: 85.5
- LogP: 2.96
- Rotatable bonds: 4
- Ring count: 4
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.45
- QED: 0.65

## Molecule Similarity
- Weighted Tanimoto: 0.59

Answer: 7.32