FAIRMol

MK219

Pose ID 9121 Compound 464 Pose 313

DB SELECTIONDocking 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 MK219
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
Weak or marginal quality
Binding strong Geometry high Native strong SASA done
Strain ΔE
21.1 kcal/mol
Protein clashes
1
Internal clashes
1
Native overlap
contact recall 0.60, Jaccard 0.36, H-bond role recall 0.20
Burial
80%
Hydrophobic fit
80%
Reason: no major geometry red flags detected
1 protein-contact clashes 76% of hydrophobic surface is solvent-exposed (19/25 atoms). Large non-polar area without protein contacts incurs a desolvation penalty and will reduce binding affinity. Consider truncating or replacing the exposed fragment.
Molecular report
Full metrics ↗
Weak Marginal quality. Consider only alongside better-scoring alternatives.
✓ Excellent LE (-0.710 kcal/mol/HA) ✓ Good fit quality (FQ -6.99) ✓ Strong H-bond network (9 bonds) ✓ Deep burial (80% SASA buried) ✓ Lipophilic contacts well-matched (80%) ✗ High strain energy (21.1 kcal/mol) ✗ Geometry warnings ✗ Many internal clashes (13)
Score
-22.730
kcal/mol
LE
-0.710
kcal/mol/HA
Fit Quality
-6.99
FQ (Leeson)
HAC
32
heavy atoms
MW
438
Da
LogP
4.28
cLogP
Strain ΔE
21.1 kcal/mol
SASA buried
80%
Lipo contact
80% BSA apolar/total
SASA unbound
707 Ų
Apolar buried
451 Ų

Interaction summary

HB 9 HY 1 PI 0 CLASH 1 ⚠ Exposure 76%

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

🚨Solvent-exposed hydrophobic surface — desolvation penalty likely
76% of hydrophobic surface is solvent-exposed (19/25 atoms). Large non-polar area without protein contacts incurs a desolvation penalty and will reduce binding affinity. Consider truncating or replacing the exposed fragment.
Non-polar atoms 25 Buried (contacted) 6 Exposed 19 LogP 4.28 H-bonds 9
Exposed fragments: phenyl (6/6 atoms exposed)phenyl (5/6 atoms exposed)phenyl (2/5 atoms exposed)aliphatic chain/group (8 atoms exposed)
Final rank4.373Score-22.730
Inter norm-0.903Intra norm0.192
Top1000noExcludedno
Contacts19H-bonds9
Artifact reasongeometry warning; 13 clashes; 3 protein clashes; moderate strain Δ 21.1
Residues
ALA283 ARG242 ARG337 ARG50 ASP243 ASP385 ASP44 ASP47 GLU384 LEU339 LEU382 MET386 PHE383 PRO338 SER282 THR21 THR241 THR285 VAL336

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 overlap9Native recall0.60
Jaccard0.36RMSD-
HB strict0Strict recall0.00
HB same residue+role1HB role recall0.20
HB same residue2HB residue recall0.40

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
364 1.829900181254628 -0.719662 -18.3424 7 15 0 0.00 0.00 - no Open
265 2.026313243924789 -1.01026 -23.2914 7 17 0 0.00 0.00 - no Open
329 2.0373471110131636 -0.869732 -22.9516 3 18 0 0.00 0.00 - no Open
330 2.058710961639984 -0.909592 -23.8784 2 20 0 0.00 0.00 - no Open
273 2.6597483939163937 -1.27139 -31.6043 10 19 0 0.00 0.00 - no Open
339 2.6953150877472445 -0.847963 -22.7415 4 18 0 0.00 0.00 - no Open
216 3.6249745621726803 -1.05167 -23.8418 13 18 0 0.00 0.00 - no Open
267 3.990038112087562 -0.793892 -22.5817 3 14 0 0.00 0.00 - no Open
240 4.268181873602591 -0.970374 -21.8269 13 23 0 0.00 0.00 - no Open
313 4.372928356142067 -0.902686 -22.7305 9 19 9 0.60 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 -22.730kcal/mol
Ligand efficiency (LE) -0.7103kcal/mol/HA
Score / heavy atom count
Fit quality (FQ) -6.985
LE / (0.072 + 0.95/HAC) — Leeson & Springthorpe
Heavy atom count 32HA

Physicochemical properties

Molecular weight 437.5Da
Lipinski: ≤ 500 Da
LogP (cLogP) 4.28
Lipinski: ≤ 5
Rotatable bonds 9

Conformational strain (MMFF94s)

Strain energy (ΔE) 21.14kcal/mol
< 5 good · 5–10 marginal · > 10 problematic
Docked FF energy 53.20kcal/mol
Minimised FF energy 32.05kcal/mol

SASA & burial

✓ computed
SASA (unbound) 706.9Ų
Total solvent-accessible surface area of free ligand
BSA total 564.5Ų
Buried surface area upon binding
BSA apolar 450.6Ų
Hydrophobic contacts buried
BSA polar 113.9Ų
Polar contacts buried
Fraction buried 79.9%
> 60 % indicates good pocket engagement
Lipophilic contact ratio 79.8%
BSA apolar / BSA total — high = hydrophobic driver
Δ Non-polar SASA -2547.2Ų
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 1385.7Ų
Non-polar SASA of full complex (VdW proxy, nonpolar atoms only)