## Endpoint to Predict
- Endpoint scope: assay
- Measurement type: IC50
- Label type: continuous
- Binary semantics: pchembl
- Assay description: Biochemical Assay: Materials: LRRK2 G2019S enzyme Substrate (LRRKtide) ATP TR-FRET dilution buffer pLRRKtide antibody 384-well assay plate DMSOEnzyme Reaction Conditions 50 mM Tris pH 7.5, 10 mM MgCl2, 1 mM EGTA, 0.01% Brij-35, 2 mM DTT 5 nM LRRK2 134 μM ATP 60 minute reaction time 23° C. reaction temperature 10 μL total reaction volumeDetection Reaction Conditions 1× TR-FRET dilution buffer 10 mM EDTA 2 nM antibody 23° C. reaction temperature 10 μL total reaction volumeCompounds were prepared by initially diluting to 1 mM with DMSO. 35 μL of reference compound solution, 35 μL of test compound solution, and 35 μL HPE were successively added to the source plate (384-well assay plate, Labcyte). The plates were centrifuged at 2500 rpm for 1 minute and sealed in foil. POD was used to perform a 3.16 fold serial dilution and 100 nL of reference compound solution, test compound solution, HPE and ZPE were transferred to assay plates. The assay plate was centrifuged at 2500 rpm for 1 minute, and sealed with foil.To perform the enzyme reaction, 5 μL of LRRKtide substrate and kinase mixture in assay buffer was added to all wells of the assay plate. The plate was centrifuged to concentrate the mixture at the bottom of the wells. The assay plate was incubated at 23° C. for 20 minutes. Following incubation, 5 μL of 2× ATP in assay buffer was added to each well, and plates were centrifuged to concentrate the mixture at the bottom of the wells. The plate was incubated at 23° C. for 60 minutes.To perform the detection of the reaction, EDTA completely mixed in TR-FRET dilution buffer was added to antibody reagent. 10 μL of detection reagent was added to all wells of each well of the assay plate and the plate was centrifuged to concentrate the mixture at the bottom of the wells. The plate was then incubated at 23° C. for 60 minutes. Plates were read on Perkin Elmer Envision 2104 instrument in TR-FRET mode using a 340 nm excitation filter, 520 nm fluorescence emission filter, and 490 or 495 nm terbium emission filter.
- Target name: Leucine-rich repeat serine/threonine-protein kinase 2
- Target type: SINGLE PROTEIN
- Target organism: Homo sapiens

## Reference Molecule A
- Canonical SMILES: COc1nc(Nc2cc(C(C)(C)n3nccn3)nn2C2CC2)ncc1Br
- Properties:
- ChEMBL ID: CHEMBL5858942
- Molecular weight: 419.29
- Heavy atoms: 26
- Hydrogen bond donors: 1
- Hydrogen bond acceptors: 7
- TPSA: 95.57
- LogP: 2.9
- Rotatable bonds: 6
- Ring count: 4
- Aromatic rings: 3
- Formal charge: 0
- Fraction Csp3: 0.44
- QED: 0.66

## Known Reference Result on This Endpoint
- Molecule A clean result: median pChEMBL = 7.35
- This result is provided as context for predicting Molecule B on the same endpoint.

## Reference Molecule A Other ChEMBL Evidence
- type IC50; relation =; value 45; units nM; pChEMBL 7.35; comment 767518

## Query Molecule B
- Canonical SMILES: CCNc1nc(Nc2cc(C3CCOCC3)nn2C)ncc1C(F)(F)F
- Properties:
- ChEMBL ID: CHEMBL5783213
- Molecular weight: 370.38
- Heavy atoms: 26
- Hydrogen bond donors: 2
- Hydrogen bond acceptors: 6
- TPSA: 76.89
- LogP: 3.3
- Rotatable bonds: 5
- Ring count: 3
- Aromatic rings: 2
- Formal charge: 0
- Fraction Csp3: 0.56
- QED: 0.84

## Molecule Similarity
- Weighted Tanimoto: 0.27

Answer: 7.35