Binder profile

GUN

Ligand co-crystallized with a similar protein (Protein Data Bank).

Bound to: PA1523 — xanthine dehydrogenase

Via homolog PDB 3nvw UniProt P80457 C5H5N5O
Mol. weight 151.13 Da
Permeability Check
PAINS Clean

Identifiers

Database identifiers and provenance.

Ligand ID
GUN
PDB
3nvw
UniProt (similar protein)
P80457
Target protein
PA1523

Structure

2D representation rendered from SMILES.

Physicochemical properties

Computed with RDKit from SMILES.

Molecular weight 151.13 Da
LogP (Crippen) -0.77
H-bond donors 3
H-bond acceptors 4
TPSA 100.45 Ų
Rotatable bonds 0
Aromatic rings 2 / 2
Heavy atoms 11
Fraction sp³ C 0.00
Formula C5H5N5O

Drug-likeness

Descriptor-based ADME screening flags from SMILES. These are not experimental toxicity results.

Permeability proxy Check

Estimated from TPSA and LogP only: TPSA ≤ 90 Ų and −1 ≤ LogP ≤ 5 are treated as a favorable small-molecule permeability screen.

Lipinski's Rule of Five Pass 0 violations
  • MW ≤ 500 Da 151.1
  • LogP ≤ 5 -0.77
  • H-bond donors ≤ 5 3
  • H-bond acceptors ≤ 10 4
Veber's rules Pass
  • Rotatable bonds ≤ 10 0
  • TPSA ≤ 140 Ų 100.5
PAINS Clean

No PAINS structural alerts detected.

Chemical representations

Canonical representations for cheminformatics workflows.

SMILES 
c1[nH]c2c(n1)C(=O)NC(=N2)N
InChI 
InChI=1S/C5H5N5O/c6-5-9-3-2(4(11)10-5)7-1-8-3/h1H,(H4,6,7,8,9,10,11)
InChIKey 
UYTPUPDQBNUYGX-UHFFFAOYSA-N

Provenance

Annotation context from LigQ_2, the internal TPW step that collects PDB, ChEMBL, and ZINC ligand evidence.

Method
LigQ nearest_k
Source
PDB
Binding sites
PF02738' 'PF20256

External resources

Open this ligand in third-party databases and cheminformatics tools.

Other binders for this protein

Quick navigation to other ligands bound to PA1523.

PDB 19

Ligands co-crystallized with this protein (structural evidence).

Ligand PDB entry

ChEMBL 100

Compounds with measured inhibitory activity on this target (higher pchembl = more potent).

Compound Potency (pchembl)

ZINC 50

Virtual screening candidates selected by structural similarity to known actives (Tanimoto ≥ 0.5).

Compound Similarity (Tanimoto)