FAIRMol

MK131

Pose ID 11795 Compound 4954 Pose 274

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 MK131
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
Promising but geometrically suspicious
Binding strong Geometry low Native strong SASA done
Strain ΔE
73.4 kcal/mol
Protein clashes
0
Internal clashes
9
Native overlap
contact recall 0.62, Jaccard 0.50
Burial
66%
Hydrophobic fit
65%
Reason: 9 internal clashes, strain 73.4 kcal/mol
strain ΔE 73.4 kcal/mol 9 intramolecular clashes
Molecular report
Full metrics ↗
Reject Multiple quality flags — this pose should be deprioritised or discarded.
✓ Excellent LE (-1.013 kcal/mol/HA) ✓ Good fit quality (FQ -9.56) ✓ Strong H-bond network (6 bonds) ✓ Deep burial (66% SASA buried) ✓ Lipophilic contacts well-matched (65%) ✗ Extreme strain energy (73.4 kcal/mol) ✗ Geometry warnings ✗ Internal clashes (9)
Score
-28.363
kcal/mol
LE
-1.013
kcal/mol/HA
Fit Quality
-9.56
FQ (Leeson)
HAC
28
heavy atoms
MW
395
Da
LogP
0.29
cLogP
Strain ΔE
73.4 kcal/mol
SASA buried
66%
Lipo contact
65% BSA apolar/total
SASA unbound
653 Ų
Apolar buried
279 Ų

Interaction summary

HB 6 HY 19 PI 2 CLASH 0

HB · H-bonds

Mode: strict. Count shows atom-level H-bonds; unique residues in summary: 0.

PI · π–π interactions

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

HY · Hydrophobic contacts

CLASH · Clashes

No clash · clashes detected for this pose.
Final rank3.331Score-28.363
Inter norm-0.751Intra norm-0.262
Top1000noExcludedno
Contacts11H-bonds6
Artifact reasongeometry warning; 9 clashes; 2 protein clashes; high strain Δ 73.4
Residues
ASP116 GLU18 GLY112 GLY13 ILE339 LEU17 MET113 SER109 SER14 TRP21 TYR110

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 overlap8Native recall0.62
Jaccard0.50RMSD-
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
274 3.330596933897339 -0.751008 -28.3633 6 11 8 0.62 - - no Current
306 3.6497166880267495 -0.682189 -21.9533 10 8 0 0.00 - - no Open

Molecular metrics

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

Scoring & efficiency

Docking score -28.363kcal/mol
Ligand efficiency (LE) -1.0130kcal/mol/HA
Score / heavy atom count
Fit quality (FQ) -9.563
LE / (0.072 + 0.95/HAC) — Leeson & Springthorpe
Heavy atom count 28HA

Physicochemical properties

Molecular weight 395.4Da
Lipinski: ≤ 500 Da
LogP (cLogP) 0.29
Lipinski: ≤ 5
Rotatable bonds 8

Conformational strain (MMFF94s)

Strain energy (ΔE) 73.43kcal/mol
< 5 good · 5–10 marginal · > 10 problematic
Docked FF energy 116.63kcal/mol
Minimised FF energy 43.20kcal/mol

SASA & burial

✓ computed
SASA (unbound) 652.5Ų
Total solvent-accessible surface area of free ligand
BSA total 429.1Ų
Buried surface area upon binding
BSA apolar 278.9Ų
Hydrophobic contacts buried
BSA polar 150.2Ų
Polar contacts buried
Fraction buried 65.8%
> 60 % indicates good pocket engagement
Lipophilic contact ratio 65.0%
BSA apolar / BSA total — high = hydrophobic driver
Δ Non-polar SASA -3090.5Ų
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 1456.0Ų
Non-polar SASA of full complex (VdW proxy, nonpolar atoms only)