FAIRMol

OSA_Lib_221

Pose ID 13084 Compound 5279 Pose 205

DB SELECTIONDocking pose analysis is being read from this database.
Compound detail Protein structures Back to compounds
Molecular metrics status: done
RDKit SASA-based burial metrics are cached.
SASA cached
T20
T. brucei TR (Z-site (fragment hotspot)) T. brucei Z-site (fragment hotspot)
Ligand OSA_Lib_221
PDB9IFH↗

3D complex viewer

Strict H-bonds Permissive H-bonds
Viewer legend
Protein receptor
Pocket residues
Cofactor context
Docked ligand
Overall assessment
Weak SASA cached
Weak or marginal quality
Binding strong Geometry medium Native strong SASA done
Strain ΔE
33.9 kcal/mol
Protein clashes
1
Internal clashes
1
Native overlap
contact recall 1.00, Jaccard 0.62, H-bond role recall 0.00
Burial
57%
Hydrophobic fit
95%
Reason: no major geometry red flags detected
1 protein-contact clashes 47% of hydrophobic surface appears solvent-exposed (15/32 atoms). Partial exposure is common but may limit selectivity and membrane permeability.
Molecular report
Full metrics ↗
Weak Marginal quality. Consider only alongside better-scoring alternatives.
✓ Excellent LE (-0.519 kcal/mol/HA) ✓ Good fit quality (FQ -5.32) ✓ Good burial (57% SASA buried) ✓ Lipophilic contacts well-matched (95%) ✗ Very high strain energy (33.9 kcal/mol) ✗ Geometry warnings ✗ Many internal clashes (14)
Score
-19.212
kcal/mol
LE
-0.519
kcal/mol/HA
Fit Quality
-5.32
FQ (Leeson)
HAC
37
heavy atoms
MW
504
Da
LogP
1.92
cLogP
Final rank
3.8605
rank score
Inter norm
-0.512
normalised
Contacts
13
H-bonds 2
Strain ΔE
33.9 kcal/mol
SASA buried
57%
Lipo contact
95% BSA apolar/total
SASA unbound
790 Ų
Apolar buried
423 Ų

Interaction summary

HBD 2 HY 4 PI 2 CLASH 1

HBD/HBA · H-bonds (geometric)
HBD = ligand donates H · HBA = ligand accepts H · ~ = weak (≥110°). Mode: strict. Residues: 2.

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.
Name9IFHContacts8
PoseOpen native poseHB0
IFP residues
ASN402 GLU467 LEU399 PHE396 PRO398 SER394 SER470 THR397
Current overlap8Native recall1.00
Jaccard0.62RMSD-
HB strict0Strict recall0.00
HB same residue+role0HB role recall0.00
HB same residue0HB residue recall0.00

Protein summary

492 residues
Protein targetT20Atoms7539
Residues492Chains1
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:264; 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
205 3.860476500199257 -0.511812 -19.2125 2 13 8 1.00 0.00 - 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 -19.212kcal/mol
Ligand efficiency (LE) -0.5193kcal/mol/HA
Score / heavy atom count
Fit quality (FQ) -5.316
LE / (0.072 + 0.95/HAC) — Leeson & Springthorpe
Heavy atom count 37HA

Physicochemical properties
Molecular weight 503.7Da
Lipinski: ≤ 500 Da
LogP (cLogP) 1.92
Lipinski: ≤ 5
Rotatable bonds 7

Conformational strain (MMFF94s)
Strain energy (ΔE) 33.93kcal/mol
< 5 good · 5–10 marginal · > 10 problematic
Docked FF energy 194.86kcal/mol
Minimised FF energy 160.93kcal/mol

SASA & burial

✓ computed
SASA (unbound) 789.9Ų
Total solvent-accessible surface area of free ligand
BSA total 447.1Ų
Buried surface area upon binding
BSA apolar 423.0Ų
Hydrophobic contacts buried
BSA polar 24.1Ų
Polar contacts buried
Fraction buried 56.6%
> 60 % indicates good pocket engagement
Lipophilic contact ratio 94.6%
BSA apolar / BSA total — high = hydrophobic driver
Δ Non-polar SASA -3317.4Ų
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 4069.8Ų
Non-polar SASA of receptor alone (VdW proxy, nonpolar atoms only)
Complex non-polar SASA 1500.2Ų
Non-polar SASA of full complex (VdW proxy, nonpolar atoms only)