FAIRMol

MK221

Pose ID 11157 Compound 649 Pose 314

DB SELECTIONDocking pose analysis is being read from this database.
Molecular metrics status: done
RDKit SASA-based burial metrics are cached.
SASA cached
T17
T. brucei TR (Doorstop site) T. brucei Doorstop site
Ligand MK221
PDB5S9T

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
23.2 kcal/mol
Protein clashes
2
Internal clashes
2
Native overlap
contact recall 0.67, Jaccard 0.35, H-bond role recall 1.00
Burial
77%
Hydrophobic fit
78%
Reason: no major geometry red flags detected
2 protein-contact clashes
Molecular report
Full metrics ↗
Weak Marginal quality. Consider only alongside better-scoring alternatives.
✓ Excellent LE (-0.574 kcal/mol/HA) ✓ Good fit quality (FQ -5.69) ✓ Strong H-bond network (6 bonds) ✓ Deep burial (77% SASA buried) ✓ Lipophilic contacts well-matched (78%) ✗ High strain energy (23.2 kcal/mol) ✗ Geometry warnings ✗ Many internal clashes (12)
Score
-18.935
kcal/mol
LE
-0.574
kcal/mol/HA
Fit Quality
-5.69
FQ (Leeson)
HAC
33
heavy atoms
MW
452
Da
LogP
4.67
cLogP
Strain ΔE
23.2 kcal/mol
SASA buried
77%
Lipo contact
78% BSA apolar/total
SASA unbound
759 Ų
Apolar buried
454 Ų

Interaction summary

HB 6 HY 14 PI 1 CLASH 2
Final rank3.667Score-18.935
Inter norm-0.698Intra norm0.124
Top1000noExcludedno
Contacts19H-bonds6
Artifact reasongeometry warning; 12 clashes; 2 protein clashes; moderate strain Δ 22.6
Residues
ALA284 ARG228 ARG287 ARG331 GLY197 GLY229 GLY286 GLY376 HIS428 ILE199 ILE378 LEU332 LEU377 MET333 PHE198 PHE230 SER200 THR374 VAL381

Protein summary

1033 residues
Protein targetT17Atoms15160
Residues1033Chains2
Residue summaryVAL:1536; LEU:1387; LYS:1386; ILE:1064; GLU:900; THR:868; ARG:816; PHE:800; ALA:780; ASN:700; PRO:686; GLY:672; SER:616; TYR:588; ASP:528; MET:408

Receptor context

2 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 2 Excluded HETATM 0
Kept cofactors / ions
A:FAD501 B:FAD501

Native ligand reference

★ reference
Interaction fingerprint calculated directly from the uploaded native ligand without docking. Current H-bond mode: strict.
Name5S9TContacts12
PoseOpen native poseHB0
IFP residues
ALA365 ARG228 ARG331 GLY229 LEU332 LEU334 MET333 PHE198 PHE230 SER364 THR374 VAL366
Current overlap8Native recall0.67
Jaccard0.35RMSD-
HB strict1Strict recall1.00
HB same residue+role1HB role recall1.00
HB same residue1HB residue recall1.00

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

All stored poses for this docking hit

PoseFinal rankInter normScoreHBCTCT overlapCT recallHB role rec.RMSDExcluded
268 0.974102900606285 -0.753355 -22.1827 4 20 0 0.00 0.00 - no Open
275 2.048310136114584 -0.934394 -26.071 5 15 0 0.00 0.00 - no Open
315 3.3238944949654337 -0.72587 -20.4346 11 16 0 0.00 0.00 - no Open
291 3.5287369862351285 -0.96868 -26.5329 9 18 0 0.00 0.00 - no Open
314 3.6667135220935343 -0.697525 -18.9353 6 19 8 0.67 1.00 - no Current
211 4.016080999071254 -0.860195 -23.0569 14 18 0 0.00 0.00 - no Open
218 4.624022710023361 -0.952362 -25.0393 11 18 0 0.00 0.00 - no Open
322 4.667651235211368 -0.611785 -19.6032 8 14 0 0.00 0.00 - no Open
341 4.781422519779941 -0.793315 -20.1332 4 20 0 0.00 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 -18.935kcal/mol
Ligand efficiency (LE) -0.5738kcal/mol/HA
Score / heavy atom count
Fit quality (FQ) -5.693
LE / (0.072 + 0.95/HAC) — Leeson & Springthorpe
Heavy atom count 33HA

Physicochemical properties

Molecular weight 451.6Da
Lipinski: ≤ 500 Da
LogP (cLogP) 4.67
Lipinski: ≤ 5
Rotatable bonds 10

Conformational strain (MMFF94s)

Strain energy (ΔE) 23.16kcal/mol
< 5 good · 5–10 marginal · > 10 problematic
Docked FF energy 48.25kcal/mol
Minimised FF energy 25.09kcal/mol

SASA & burial

✓ computed
SASA (unbound) 759.2Ų
Total solvent-accessible surface area of free ligand
BSA total 584.8Ų
Buried surface area upon binding
BSA apolar 454.4Ų
Hydrophobic contacts buried
BSA polar 130.3Ų
Polar contacts buried
Fraction buried 77.0%
> 60 % indicates good pocket engagement
Lipophilic contact ratio 77.7%
BSA apolar / BSA total — high = hydrophobic driver
Δ Non-polar SASA -6610.0Ų
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 8063.1Ų
Non-polar SASA of receptor alone (VdW proxy, nonpolar atoms only)
Complex non-polar SASA 2079.4Ų
Non-polar SASA of full complex (VdW proxy, nonpolar atoms only)