## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: EC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: The screening assay for DYRK1A kinase activity : Each compound was dissolved in DMSO as a 10 mM stock and used to prepare compound source plates. Serial dilution (1:3, 11-point dose-response curves from 10 μM to 0 μM) and compound transfer was performed using the ECHO 550 (Labcyte, Sunnyvale, Calif.) into 1536-well black-walled round bottom plates (Corning).The DYRK1A kinase assay was run using the Ser/Thr 18 peptide Z-lyte assay kit according to manufacturer's instructions (Life Technologiesa Division of Thermo-Fisher). This is a non-radioactive assay using fluorescence resonance energy transfer (FRET) between coumarin and fluorescein to detect kinase activity which is represented as a ratio of coumarin emission/fluorescein emission.Briefly, recombinant DYRK1A kinase, ATP and Ser/Thr peptide 18 were prepared in 1× Kinase buffer to final concentrations of 0.19 μg/mL, 30 μM, and 4 μM respectively. The mixture was allowed to incubate with the representative compounds for one hour at room temperature. All reactions were performed in duplicate. Unphosphorylated (0% Control) and phosphorylated (100% control) forms of Ser/Thr 18 served as control reactions. Additionally, an 11-point dose-response curve of Staurosporine (1 uM top) was run to serve as a positive compound control.After incubation, Development Reagent A was diluted in Development Buffer then added to the reaction and allowed to further incubate for one hour at room temperature. The plate was read at Ex 400 Em 455 to detect the coumarin signal and Ex 400 Em 520 to measure the signal (EnVision Multilabel Plate Reader, PerkinElmer).The Emission ratio (Em) was calculated as a ratio of the coumarin (C) emission signal (at 445 nm)/Fluorescein (F) emission signal (at 520 nm). The percent phosphorylation was then calculated using the following formula: [1−((Em ratio×F100%)−C100%)/((C0%−C100%)+(Em ratio×(F100%−F0%)))]. Dose-response curves were generated and inhibitory concentration (IC50) values were calculated using non-linear regression curve fit in the Dotmatics' Studies Software (Bishops Stortford, UK).
- Assay organism: Homo sapiens
- Target name: Dual specificity tyrosine-phosphorylation-regulated kinase 1A
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: CC(C)CN1CCC[C@H](C(=O)Nc2cc3cc(-c4cnn(C)c4)ccc3cn2)C1
- Properties:
- ChEMBL ID: CHEMBL5830113
- Molecular weight: 391.52
- Heavy atoms: 29
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 4
- TPSA: 63.05
- LogP: 3.94
- Rotatable bonds: 5
- Ring count: 4
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.43
- QED: 0.72

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 7.69
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type EC50; relation =; value 20.6; units nM; pChEMBL 7.69; comment 768935

## Query Molecule B
- Canonical SMILES: CC(C)CN1CCCC(C(=O)Nc2cc3cc(-c4cnn5c4CN(CCF)CC5)ccc3cn2)C1
- Properties:
- ChEMBL ID: CHEMBL6046307
- Molecular weight: 478.62
- Heavy atoms: 35
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 5
- TPSA: 66.29
- LogP: 4.19
- Rotatable bonds: 7
- Ring count: 5
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.52
- QED: 0.55

## Molecule Similarity
- Weighted Tanimoto: 0.69

Answer: 7.54