## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: Kinase Active Site Binding Assay: Compound binding to the ASK1 kinase active site was determined using the KINOMEscan Assay platform (DiscoverX, San Diego, Calif.). Briefly, ASK1-tagged T7 phage strains were prepared in an E. coli host derived from the BL21 strain. E. coli were grown to log-phase and infected with T7 phage and incubated with shaking at 32° C. until lysis. The lysates were centrifuged and filtered to remove cell debris. The remaining kinases were produced in HEK-293 cells and subsequently tagged with DNA for qPCR detection. Streptavidin-coated magnetic beads were treated with biotinylated small molecule ligands for 30 minutes at room temperature to generate affinity resins for kinase assays. The liganded beads were blocked with excess biotin and washed with blocking buffer (SeaBlock (Pierce), 1% BSA, 0.05% Tween 20, 1 mM DTT) to remove unbound ligand and to reduce nonspecific binding. Binding reactions were assembled by combining kinases, liganded affinity beads, and test compounds in 1× binding buffer (20% SeaBlock, 0.17×PBS, 0.05% Tween 20, 6 mM DTT). Test compounds were prepared as 111× stocks in 100% DMSO. Kds were determined using an 11-point 3-fold compound dilution series with three DMSO control points. All compounds for Kd measurements are distributed by acoustic transfer (non-contact dispensing) in 100% DMSO. The compounds were then diluted directly into the assays such that the final concentration of DMSO was 0.9%. All reactions performed in polypropylene 384-well plate. Each was a final volume of 0.02 mL. The assay plates were incubated at room temperature with shaking for 1 hour and the affinity beads were washed with wash buffer (1×PBS, 0.05% Tween 20). The beads were then re-suspended in elution buffer (1×PBS, 0.05% Tween 20, 0.5 μM non-biotinylated affinity ligand) and incubated at room temperature with shaking for 30 minutes.
- Target name: Mitogen-activated protein kinase kinase kinase 5
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: CC(C)n1cnnc1-c1cccc(N2Cc3ccc(-c4ccc(C(=O)O)c(F)c4)cc3C2=O)n1
- Properties:
- ChEMBL ID: CHEMBL5862012
- Molecular weight: 457.47
- Heavy atoms: 34
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 5
- TPSA: 101.21
- LogP: 4.59
- Rotatable bonds: 5
- Ring count: 5
- Aromatic rings: 4
- Formal charge: 0
- Fraction Csp3: 0.16
- QED: 0.47

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 8.48
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 3.3; units nM; pChEMBL 8.48; comment 902984

## Query Molecule B
- Canonical SMILES: CC(C)n1cnnc1-c1cccc(N2Cc3ccc(-c4cccc(C(=O)O)c4)cc3C2=O)n1
- Properties:
- ChEMBL ID: CHEMBL5780163
- Molecular weight: 439.48
- Heavy atoms: 33
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 5
- TPSA: 101.21
- LogP: 4.45
- Rotatable bonds: 5
- Ring count: 5
- Aromatic rings: 4
- Formal charge: 0
- Fraction Csp3: 0.16
- QED: 0.49

## Molecule Similarity
- Weighted Tanimoto: 0.8

Answer: 8.28