FAIRMol

MK26

Pose ID 9090 Compound 465 Pose 282

DB fairmolDocking pose analysis is being read from this database.
Molecular metrics status: done
RDKit SASA-based burial metrics are cached.
SASA cached
T14
T. brucei ODC (G418 binding site) T. brucei G418 binding site
Ligand MK26
PDB1NJJ

3D complex viewer

Strict H-bonds Permissive H-bonds
Viewer legend
Protein receptor
Pocket residues
Cofactor context
Docked ligand
Overall assessment
Weak SASA cached
Promising but geometrically suspicious
Binding strong Geometry low Native mixed SASA done
Strain ΔE
33.6 kcal/mol
Protein clashes
11
Internal clashes
11
Native overlap
contact recall 0.53, Jaccard 0.33, H-bond role recall 0.20
Burial
76%
Hydrophobic fit
86%
Reason: 11 protein-contact clashes, 11 internal clashes
11 protein-contact clashes 11 intramolecular clashes 52% of hydrophobic surface appears solvent-exposed (14/27 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 (-0.524 kcal/mol/HA) ✓ Good fit quality (FQ -5.28) ✓ Strong H-bond network (8 bonds) ✓ Deep burial (76% SASA buried) ✓ Lipophilic contacts well-matched (86%) ✗ Very high strain energy (33.6 kcal/mol) ✗ Geometry warnings ✗ Many internal clashes (13)
Score
-18.331
kcal/mol
LE
-0.524
kcal/mol/HA
Fit Quality
-5.28
FQ (Leeson)
HAC
35
heavy atoms
MW
503
Da
LogP
2.43
cLogP
Strain ΔE
33.6 kcal/mol
SASA buried
76%
Lipo contact
86% BSA apolar/total
SASA unbound
837 Ų
Apolar buried
550 Ų

Interaction summary

HB 8 HY 10 PI 0 CLASH 11 ⚠ Exposure 51%

HB · H-bonds

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

PI · π–π interactions

No pi · π–π interactions detected for this pose.

HY · Hydrophobic contacts

CLASH · Clashes

⚠️Partial hydrophobic solvent exposure
52% of hydrophobic surface appears solvent-exposed (14/27 atoms). Partial exposure is common but may limit selectivity and membrane permeability.
Non-polar atoms 27 Buried (contacted) 13 Exposed 14 LogP 2.43 H-bonds 8
Exposed fragments: phenyl (6/6 atoms exposed)phenyl (5/6 atoms exposed)aliphatic chain/group (5 atoms exposed)
Final rank6.178Score-18.331
Inter norm-0.658Intra norm0.132
Top1000noExcludedno
Contacts17H-bonds8
Artifact reasongeometry warning; 13 clashes; 3 protein clashes; moderate strain Δ 26.5
Residues
ALA283 ARG22 ARG342 ARG50 ASN20 ASP44 ASP47 CYS26 GLN341 GLU343 GLU384 LEU25 LEU382 PRO340 SER282 THR21 THR285

Native ligand reference

★ reference
Interaction fingerprint calculated directly from the uploaded native ligand without docking. Current H-bond mode: strict.
Name1NJJContacts15
PoseOpen native poseHB0
IFP residues
ARG22 ARG242 ARG337 ARG342 ASP243 ASP385 GLN341 GLU384 LEU25 LEU339 LEU382 PRO340 PRO344 SER282 THR241
Current overlap8Native recall0.53
Jaccard0.33RMSD-
HB strict1Strict recall0.17
HB same residue+role1HB role recall0.20
HB same residue1HB residue recall0.20

Protein summary

398 residues
Protein targetT14Atoms6140
Residues398Chains1
Residue summaryVAL:592; LEU:513; LYS:484; ARG:432; PHE:420; ILE:418; ASP:349; THR:322; TYR:315; PRO:308; GLU:301; ALA:290; SER:253; GLY:217; ASN:210; GLN:170

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:ORX602

All stored poses for this docking hit

PoseFinal rankInter normScoreHBCTCT overlapCT recallHB role rec.RMSDExcluded
319 2.6975914816310187 -0.730471 -21.6464 2 18 0 0.00 0.00 - no Open
283 3.0032633616001716 -0.679398 -20.8205 5 24 0 0.00 0.00 - no Open
379 3.3715312613135215 -0.712779 -20.093 5 19 0 0.00 0.00 - no Open
242 3.712098901868518 -0.710593 -20.5436 3 20 0 0.00 0.00 - no Open
282 6.178120509243062 -0.658338 -18.331 8 17 8 0.53 0.20 - 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 -18.331kcal/mol
Ligand efficiency (LE) -0.5237kcal/mol/HA
Score / heavy atom count
Fit quality (FQ) -5.283
LE / (0.072 + 0.95/HAC) — Leeson & Springthorpe
Heavy atom count 35HA

Physicochemical properties

Molecular weight 502.7Da
Lipinski: ≤ 500 Da
LogP (cLogP) 2.43
Lipinski: ≤ 5
Rotatable bonds 8

Conformational strain (MMFF94s)

Strain energy (ΔE) 33.63kcal/mol
< 5 good · 5–10 marginal · > 10 problematic
Docked FF energy 95.37kcal/mol
Minimised FF energy 61.74kcal/mol

SASA & burial

✓ computed
SASA (unbound) 836.8Ų
Total solvent-accessible surface area of free ligand
BSA total 638.7Ų
Buried surface area upon binding
BSA apolar 549.7Ų
Hydrophobic contacts buried
BSA polar 89.0Ų
Polar contacts buried
Fraction buried 76.3%
> 60 % indicates good pocket engagement
Lipophilic contact ratio 86.1%
BSA apolar / BSA total — high = hydrophobic driver
Δ Non-polar SASA -2705.3Ų
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 3349.0Ų
Non-polar SASA of receptor alone (VdW proxy, nonpolar atoms only)
Complex non-polar SASA 1389.7Ų
Non-polar SASA of full complex (VdW proxy, nonpolar atoms only)