FAIRMol

OSA_Lib_57

Pose ID 11707 Compound 4896 Pose 186

DB SELECTIONDocking pose analysis is being read from this database.
Molecular metrics status: done
RDKit SASA-based burial metrics are cached.
SASA cached
T18
T. brucei TR (Mepacrine binding site (MBS, site 1)) T. brucei Mepacrine binding site (MBS, site 1)
Ligand OSA_Lib_57
PDB6RB5

3D complex viewer

Strict H-bonds Permissive H-bonds
Viewer legend
Protein receptor
Pocket residues
Cofactor context
Docked ligand
Overall assessment
Reject SASA cached
Likely artefact or unreliable pose
Binding strong Geometry medium Native strong SASA done
Strain ΔE
41.6 kcal/mol
Protein clashes
1
Internal clashes
1
Native overlap
contact recall 0.77, Jaccard 0.77
Burial
53%
Hydrophobic fit
94%
Reason: no major geometry red flags detected
1 protein-contact clashes 52% of hydrophobic surface appears solvent-exposed (17/33 atoms). Partial exposure is common but may limit selectivity and membrane permeability.
EcoTox / ADMET In-silico prediction only
Fish LC₅₀
Not classified (>100 mg/L)
Daphnia EC₅₀
Not classified (>100 mg/L)
Algae IC₅₀
Not classified (>100 mg/L)
Bioaccum.
Not B (BCF≤2000)
Persistent
No
ADMET alerts (in-silico)
hERG Low Ames Clear DILI Low
Molecular report
Full metrics ↗
Reject Multiple quality flags — this pose should be deprioritised or discarded.
✓ Excellent LE (-0.525 kcal/mol/HA) ✓ Good fit quality (FQ -5.42) ✓ Good burial (53% SASA buried) ✓ Lipophilic contacts well-matched (94%) ✗ Extreme strain energy (41.6 kcal/mol) ✗ Geometry warnings ✗ Minor protein-contact clashes (4) ✗ Many internal clashes (20)
Score
-19.962
kcal/mol
LE
-0.525
kcal/mol/HA
Fit Quality
-5.42
FQ (Leeson)
HAC
38
heavy atoms
MW
517
Da
LogP
1.98
cLogP
Final rank
2.2978
rank score
Inter norm
-0.540
normalised
Contacts
10
H-bonds 1
Strain ΔE
41.6 kcal/mol
SASA buried
53%
Lipo contact
94% BSA apolar/total
SASA unbound
826 Ų
Apolar buried
412 Ų

Interaction summary

HBD 1 HY 5 PI 3 CLASH 1

HBD/HBA · H-bonds (geometric)

HBD = ligand donates H · HBA = ligand accepts H · ~ = weak (≥110°). Mode: strict. Residues: 1.

PI · π–π interactions

Native π–π recall is disabled because no explicit native π–π reference was stored.

HY · Hydrophobic contacts

CLASH · Clashes

Native ligand reference

★ reference
Interaction fingerprint calculated directly from the uploaded native ligand without docking. Current H-bond mode: strict.
Name6RB5Contacts13
PoseOpen native poseHB0
IFP residues
ASP116 GLU18 GLY112 ILE106 LEU17 MET113 SER109 THR117 THR335 TRP21 TYR110 VAL53 VAL58
Current overlap10Native recall0.77
Jaccard0.77RMSD-
HB strict0Strict recall-
HB same residue+role0HB role recall-
HB same residue0HB residue recall-

Protein summary

493 residues
Protein targetT18Atoms7550
Residues493Chains1
Residue summaryVAL:768; LYS:704; LEU:703; ILE:532; GLU:450; THR:434; ARG:408; PHE:400; ALA:390; ASN:350; PRO:350; GLY:336; SER:319; TYR:294; ASP:276; MET:221

Receptor context

1 kept / 0 excluded
Receptor context filtering: interactions and SASA are computed against protein atoms plus allowed cofactors/ions. Native ligand-like HETATM partners are excluded from scoring.
Kept context 1 Excluded HETATM 0
Kept cofactors / ions
A:FAD501

All stored poses for this docking hit

PoseFinal rankInter normScoreHBCTCT overlapCT recallHB role rec.RMSDExcluded
186 2.297754622281581 -0.540004 -19.9621 1 10 10 0.77 - - no Current

Molecular metrics

RDKit SASA burial, strain energy (MMFF94s), ligand efficiency and fit quality for this docking pose.
✓ Metrics available

Scoring & efficiency

Docking score -19.962kcal/mol
Ligand efficiency (LE) -0.5253kcal/mol/HA
Score / heavy atom count
Fit quality (FQ) -5.416
LE / (0.072 + 0.95/HAC) — Leeson & Springthorpe
Heavy atom count 38HA

Physicochemical properties

Molecular weight 516.8Da
Lipinski: ≤ 500 Da
LogP (cLogP) 1.98
Lipinski: ≤ 5
Rotatable bonds 6

Conformational strain (MMFF94s)

Strain energy (ΔE) 41.58kcal/mol
< 5 good · 5–10 marginal · > 10 problematic
Docked FF energy 213.30kcal/mol
Minimised FF energy 171.72kcal/mol

SASA & burial

✓ computed
SASA (unbound) 825.8Ų
Total solvent-accessible surface area of free ligand
BSA total 439.3Ų
Buried surface area upon binding
BSA apolar 412.3Ų
Hydrophobic contacts buried
BSA polar 27.1Ų
Polar contacts buried
Fraction buried 53.2%
> 60 % indicates good pocket engagement
Lipophilic contact ratio 93.8%
BSA apolar / BSA total — high = hydrophobic driver
Δ Non-polar SASA -3397.1Ų
SASA_nonpolar(complex) − SASA_nonpolar(receptor) − SASA_nonpolar(ligand free). Negative = non-polar surface buried upon binding. Requires full polarity-decomposed SASA computation.
Receptor non-polar SASA 4076.6Ų
Non-polar SASA of receptor alone (VdW proxy, nonpolar atoms only)
Complex non-polar SASA 1475.2Ų
Non-polar SASA of full complex (VdW proxy, nonpolar atoms only)