FAIRMol

MK220

Pose ID 4337 Compound 2157 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
T07
T. brucei PTR1 T. brucei
Ligand MK220
PDB6RX6

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
30.6 kcal/mol
Protein clashes
1
Internal clashes
1
Native overlap
contact recall 0.58, Jaccard 0.55, H-bond role recall 0.40
Burial
75%
Hydrophobic fit
82%
Reason: no major geometry red flags detected
1 protein-contact clashes
Molecular report
Full metrics ↗
Weak Marginal quality. Consider only alongside better-scoring alternatives.
✓ Excellent LE (-0.848 kcal/mol/HA) ✓ Good fit quality (FQ -8.33) ✓ Strong H-bond network (8 bonds) ✓ Deep burial (75% SASA buried) ✓ Lipophilic contacts well-matched (82%) ✗ Very high strain energy (30.6 kcal/mol) ✗ Geometry warnings ✗ Many internal clashes (13)
Score
-27.120
kcal/mol
LE
-0.848
kcal/mol/HA
Fit Quality
-8.33
FQ (Leeson)
HAC
32
heavy atoms
MW
438
Da
LogP
4.28
cLogP
Strain ΔE
30.6 kcal/mol
SASA buried
75%
Lipo contact
82% BSA apolar/total
SASA unbound
722 Ų
Apolar buried
444 Ų

Interaction summary

HB 8 HY 24 PI 3 CLASH 1
Final rank0.574Score-27.120
Inter norm-0.990Intra norm0.143
Top1000noExcludedno
Contacts12H-bonds8
Artifact reasongeometry warning; 13 clashes; 1 protein contact clash; 2 severe cofactor-context clashes; high strain Δ 30.6
Residues
ARG14 ASP161 CYS168 GLU217 MET213 NAP301 PHE171 PHE97 PRO210 SER95 TRP221 TYR174

Protein summary

275 residues
Protein targetT07Atoms3932
Residues275Chains3
Residue summaryLEU:437; VAL:433; ALA:361; ARG:288; ILE:266; GLU:210; LYS:198; SER:198; ASN:182; THR:154; GLN:153; PHE:140; PRO:140; TYR:126; GLY:112; HIS:103

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:NAP301

Native ligand reference

★ reference
Interaction fingerprint calculated directly from the uploaded native ligand without docking. Current H-bond mode: strict.
NameTbPTR1_cW_6RX6_ReadyContacts19
PoseOpen native poseHB0
IFP residues
ARG14 ASP161 CYS168 GLY205 LEU208 LEU209 LYS178 MET213 NAP301 PHE171 PHE97 PRO210 PRO99 SER207 SER95 TRP221 TYR174 TYR98 VAL206
Current overlap11Native recall0.58
Jaccard0.55RMSD-
HB strict3Strict recall0.50
HB same residue+role2HB role recall0.40
HB same residue2HB residue recall0.40

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
274 0.5742700777155489 -0.990165 -27.1203 8 12 11 0.58 0.40 - no Current
261 0.9719492413306788 -0.779872 -18.5123 6 19 0 0.00 0.00 - no Open
250 2.2553998643367166 -0.8863 -22.4828 4 14 0 0.00 0.00 - no Open
238 2.890295633710476 -0.925711 -29.2458 13 20 0 0.00 0.00 - no Open
290 3.8782243837340302 -0.732874 -14.4334 9 17 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 -27.120kcal/mol
Ligand efficiency (LE) -0.8475kcal/mol/HA
Score / heavy atom count
Fit quality (FQ) -8.334
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) 30.59kcal/mol
< 5 good · 5–10 marginal · > 10 problematic
Docked FF energy 52.69kcal/mol
Minimised FF energy 22.10kcal/mol

SASA & burial

✓ computed
SASA (unbound) 722.1Ų
Total solvent-accessible surface area of free ligand
BSA total 538.6Ų
Buried surface area upon binding
BSA apolar 444.5Ų
Hydrophobic contacts buried
BSA polar 94.1Ų
Polar contacts buried
Fraction buried 74.6%
> 60 % indicates good pocket engagement
Lipophilic contact ratio 82.5%
BSA apolar / BSA total — high = hydrophobic driver
Δ Non-polar SASA -1739.4Ų
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 2051.9Ų
Non-polar SASA of receptor alone (VdW proxy, nonpolar atoms only)
Complex non-polar SASA 919.1Ų
Non-polar SASA of full complex (VdW proxy, nonpolar atoms only)