FAIRMol

MK21

Pose ID 11124 Compound 3353 Pose 281

DB fairmolDocking 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 MK21
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
Promising but geometrically suspicious
Binding strong Geometry low Native strong SASA done
Strain ΔE
24.7 kcal/mol
Protein clashes
0
Internal clashes
15
Native overlap
contact recall 0.67, Jaccard 0.35, H-bond role recall 1.00
Burial
81%
Hydrophobic fit
84%
Reason: 15 internal clashes
15 intramolecular clashes
EcoTox / ADMET In-silico prediction only
Fish LC₅₀
Cat. 2 — Toxic (1–10 mg/L)
Daphnia EC₅₀
Cat. 2 — Toxic (1–10 mg/L)
Algae IC₅₀
Cat. 2 — Toxic (1–10 mg/L)
Bioaccum.
Not B (BCF≤2000)
Persistent
No
ADMET alerts (in-silico)
hERG High Ames Clear DILI Low
Molecular report
Full metrics ↗
Weak Marginal quality. Consider only alongside better-scoring alternatives.
✓ Excellent LE (-0.662 kcal/mol/HA) ✓ Good fit quality (FQ -6.62) ✓ Good H-bonds (5 bonds) ✓ Deep burial (81% SASA buried) ✓ Lipophilic contacts well-matched (84%) ✗ High strain energy (24.7 kcal/mol) ✗ Geometry warnings ✗ Many internal clashes (15)
Score
-22.497
kcal/mol
LE
-0.662
kcal/mol/HA
Fit Quality
-6.62
FQ (Leeson)
HAC
34
heavy atoms
MW
488
Da
LogP
3.80
cLogP
Final rank
5.2516
rank score
Inter norm
-0.725
normalised
Contacts
19
H-bonds 9
Strain ΔE
24.7 kcal/mol
SASA buried
81%
Lipo contact
84% BSA apolar/total
SASA unbound
796 Ų
Apolar buried
538 Ų

Interaction summary

HBD 2 HBA 3 HY 6 PI 1 CLASH 0

HBD/HBA · H-bonds (geometric)

HBD = ligand donates H · HBA = ligand accepts H · ~ = weak (≥110°). Mode: strict. Residues: 3.

PI · π–π interactions

Native π–π recall is disabled because no explicit native π–π reference was stored.

HY · Hydrophobic contacts

CLASH · Clashes

No clash · clashes detected for this pose.

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

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

All stored poses for this docking hit

PoseFinal rankInter normScoreHBCTCT overlapCT recallHB role rec.RMSDExcluded
219 4.122996626510379 -0.829249 -26.4435 5 16 0 0.00 0.00 - no Open
281 5.25162699390135 -0.725319 -22.4969 9 19 8 0.67 1.00 - 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 -22.497kcal/mol
Ligand efficiency (LE) -0.6617kcal/mol/HA
Score / heavy atom count
Fit quality (FQ) -6.621
LE / (0.072 + 0.95/HAC) — Leeson & Springthorpe
Heavy atom count 34HA

Physicochemical properties

Molecular weight 487.7Da
Lipinski: ≤ 500 Da
LogP (cLogP) 3.80
Lipinski: ≤ 5
Rotatable bonds 7

Conformational strain (MMFF94s)

Strain energy (ΔE) 24.75kcal/mol
< 5 good · 5–10 marginal · > 10 problematic
Docked FF energy 59.79kcal/mol
Minimised FF energy 35.04kcal/mol

SASA & burial

✓ computed
SASA (unbound) 796.5Ų
Total solvent-accessible surface area of free ligand
BSA total 644.5Ų
Buried surface area upon binding
BSA apolar 538.4Ų
Hydrophobic contacts buried
BSA polar 106.1Ų
Polar contacts buried
Fraction buried 80.9%
> 60 % indicates good pocket engagement
Lipophilic contact ratio 83.5%
BSA apolar / BSA total — high = hydrophobic driver
Δ Non-polar SASA -6695.9Ų
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 2054.3Ų
Non-polar SASA of full complex (VdW proxy, nonpolar atoms only)