FAIRMol

MK220

Pose ID 14479 Compound 167 Pose 241

DB fairmolDocking pose analysis is being read from this database.
Compound detail Protein structures Back to compounds
Molecular metrics status: done
RDKit SASA-based burial metrics are cached.
SASA cached
T22
L. donovani rab5a L. donovani
Ligand MK220

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
21.3 kcal/mol
Protein clashes
7
Internal clashes
7
Native overlap
contact recall 1.00, Jaccard 0.84, H-bond role recall 0.36
Burial
86%
Hydrophobic fit
81%
Reason: 7 internal clashes
7 protein-contact clashes 7 intramolecular clashes 60% of hydrophobic surface is solvent-exposed (15/25 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 (-0.936 kcal/mol/HA) ✓ Good fit quality (FQ -9.20) ✓ Strong H-bond network (6 bonds) ✓ Deep burial (86% SASA buried) ✓ Lipophilic contacts well-matched (81%) ✗ High strain energy (21.3 kcal/mol) ✗ Geometry warnings ✗ Many internal clashes (11)
Score
-29.939
kcal/mol
LE
-0.936
kcal/mol/HA
Fit Quality
-9.20
FQ (Leeson)
HAC
32
heavy atoms
MW
438
Da
LogP
4.28
cLogP
Final rank
5.4953
rank score
Inter norm
-0.968
normalised
Contacts
25
H-bonds 9
Strain ΔE
21.3 kcal/mol
SASA buried
86%
Lipo contact
81% BSA apolar/total
SASA unbound
738 Ų
Apolar buried
513 Ų

Interaction summary

HBD 1 HBA 5 HY 2 PI 1 CLASH 7

HBD/HBA · H-bonds (geometric)
HBD = ligand donates H · HBA = ligand accepts H · ~ = weak (≥110°). Mode: permissive. Residues: 4.

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

HY · Hydrophobic contacts

CLASH · Clashes

Native ligand reference

★ reference
Interaction fingerprint calculated directly from the uploaded native ligand without docking. Current H-bond mode: permissive.
NameRAB5AContacts21
PoseOpen native poseHB0
IFP residues
ALA158 ALA24 ALA40 ASN126 ASN41 ASP129 GLN42 GLU21 GLU73 GLY23 GLY25 LEU130 LEU39 LYS127 LYS159 LYS26 PHE38 SER157 SER22 SER27 SER28
Current overlap21Native recall1.00
Jaccard0.84RMSD-
HB strict5Strict recall0.33
HB same residue+role4HB role recall0.36
HB same residue4HB residue recall0.36

Protein summary

165 residues
Protein targetT22Atoms2561
Residues165Chains1
Residue summaryLEU:363; LYS:242; ALA:231; ARG:214; ILE:190; GLU:180; VAL:144; SER:143; PHE:140; ASN:112; THR:112; TYR:105; GLN:102; ASP:96; GLY:77; TRP:48

All stored poses for this docking hit

PoseFinal rankInter normScoreHBCTCT overlapCT recallHB role rec.RMSDExcluded
340 1.3223938073115098 -0.927161 -24.2651 8 16 0 0.00 0.00 - no Open
394 2.014161173473132 -0.775497 -19.6976 10 10 0 0.00 0.00 - no Open
290 2.73482945957276 -0.878682 -21.3656 12 17 0 0.00 0.00 - no Open
249 3.165423711787248 -0.802147 -20.1063 3 19 0 0.00 0.00 - no Open
314 3.7162080227370713 -0.874068 -20.3152 7 13 0 0.00 0.00 - no Open
365 3.9636524130908617 -0.716261 -19.4033 6 14 0 0.00 0.00 - no Open
217 4.166365624759972 -0.935886 -25.7232 10 16 0 0.00 0.00 - no Open
330 4.277927265958028 -0.950834 -24.4595 5 17 0 0.00 0.00 - no Open
321 4.96208626260307 -0.705542 -18.3404 7 11 0 0.00 0.00 - no Open
241 5.4952799348659935 -0.968125 -29.9385 9 25 21 1.00 0.36 - 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 -29.939kcal/mol
Ligand efficiency (LE) -0.9356kcal/mol/HA
Score / heavy atom count
Fit quality (FQ) -9.201
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) 21.26kcal/mol
< 5 good · 5–10 marginal · > 10 problematic
Docked FF energy 41.90kcal/mol
Minimised FF energy 20.64kcal/mol

SASA & burial

✓ computed
SASA (unbound) 737.8Ų
Total solvent-accessible surface area of free ligand
BSA total 633.5Ų
Buried surface area upon binding
BSA apolar 512.5Ų
Hydrophobic contacts buried
BSA polar 120.9Ų
Polar contacts buried
Fraction buried 85.9%
> 60 % indicates good pocket engagement
Lipophilic contact ratio 80.9%
BSA apolar / BSA total — high = hydrophobic driver
Δ Non-polar SASA -1482.6Ų
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 1368.5Ų
Non-polar SASA of receptor alone (VdW proxy, nonpolar atoms only)
Complex non-polar SASA 499.0Ų
Non-polar SASA of full complex (VdW proxy, nonpolar atoms only)