## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: JAK1 and JAK3 Enzyme Activity Assays: The activity of JAK3 (a.a. 781-1124, ThermoFisher) was quantified by measuring the phosphorylation of SRCtide (FAM-GEEPLYWSFPAKKK-NH2). Kinase reactions were run in a 384-well Greiner plate with 2% final DMSO concentration under the buffer conditions of 20 mM HEPES, pH 7.5, 10 mM MgCl2, 0.01% BSA, and 0% Tween-20. The kinase reaction components were 2.5 nM JAK3, 1 μM SRCtide peptide and 1 uM ATP. Examples were tested in dose-response starting at 2 μM (11 concentrations, 3-fold serial dilution, duplicate reactions). The reactions were incubated at room temperature for 40 minutes, then stopped by adding a 1:1 volume of 30 mM EDTA in 20 mM HEPES, pH 7.5 (15 mM EDTA final). After the reaction was stopped, the phosphorylated and unphosphorylated peptides were separated and quantified using a Caliper LC3000/EZ-Reader system and HTS Well Analyzer Software (Caliper, A PerkinElmer Company, Hopkinton, Mass.). GraFit (Erithacus Software Ltd., Horley, U.K.) was used to calculate inhibitor potency by fitting dose-response data to the 4-parameter logistical IC50 equation.The inhibitory potency of candidate compounds of JAK1 done at Thermo Fisher Scientific in their Selectscreen using a Z-lyte assay. The 2×JAK1/Tyr 06 mixture is prepared in 50 mM HEPES pH 6.5, 0.01% BRIJ-35, 10 mM MgCl2, 1 mM EGTA, 0.02% NaN3. The final 10 μL of the Kinase Reaction consists of 21.2-91.5 ng JAK1 and 2 μM Tyr 06 in 50 mM HEPES pH 7, 0.01% BRIJ-35, 10 mM MgCl2, 1 mM EGTA, 0.01% NaN3. After the 1 hour Kinase Reaction incubation, 5 μL of a 1:128 dilution of Development Reagent is added.Background signal is defined in the absence of enzyme and uninhibited signal is defined in the presence of vehicle (2% DMSO) alone. Compounds were evaluated in an 11 point dose-response ranging from 20 mM to 0.34 nM. IC50 values of compounds are determined using a 4 parameter logistical fit of emission ratio as a function of the concentration of compound.
- Target name: Tyrosine-protein kinase JAK3
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: CCOC(=O)c1cnc2[nH]ccc2c1N[C@@H]1CCCN(C(=O)C(C)C#N)C1
- Properties:
- ChEMBL ID: CHEMBL5909013
- Molecular weight: 369.43
- Heavy atoms: 27
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 6
- TPSA: 111.11
- LogP: 2.3
- Rotatable bonds: 5
- Ring count: 3
- Aromatic rings: 2
- Formal charge: 0
- Fraction Csp3: 0.47
- QED: 0.78

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 6.26
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 550; units nM; pChEMBL 6.26; comment 1025752

## Query Molecule B
- Canonical SMILES: CCCOC(=O)c1cnc2[nH]ccc2c1N[C@H]1CCC[C@H](CCC#N)C1
- Properties:
- ChEMBL ID: CHEMBL5877375
- Molecular weight: 354.45
- Heavy atoms: 26
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 5
- TPSA: 90.8
- LogP: 4.4
- Rotatable bonds: 7
- Ring count: 3
- Aromatic rings: 2
- Formal charge: 0
- Fraction Csp3: 0.55
- QED: 0.72

## Molecule Similarity
- Weighted Tanimoto: 0.59

Answer: 6.26