Ligand profile

KB5

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

Bound to: KP13_03284 — Endonuclease 8 bifunctional protein

Via homolog PDB 6rnm UniProt P42371 Formula C₅H₅N₅S
Mol. weight 167.20 Da
Permeability High
PAINS Clean

Identifiers

Database identifiers and provenance.

Ligand ID
KB5
PDB
6rnm
UniProt (similar protein)
P42371
Target protein
KP13_03284

Structure

2D representation rendered from SMILES.

Physicochemical properties

Computed with RDKit from SMILES.

Molecular weight 167.20 Da
LogP (Crippen) 0.22
H-bond donors 3
H-bond acceptors 5
TPSA 80.48 Ų
Rotatable bonds 0
Aromatic rings 2 / 2
Heavy atoms 11
Fraction sp³ C 0.00
Formula C₅H₅N₅S

Drug-likeness

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

Permeability proxy High

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

  • TPSA ≤ 90 Ų 80.5
  • −1 ≤ LogP ≤ 5 0.22
Lipinski's Rule of Five Pass 0 violations
  • MW ≤ 500 Da 167.2
  • LogP ≤ 5 0.22
  • H-bond donors ≤ 5 3
  • H-bond acceptors ≤ 10 5
Veber's rules Pass
  • Rotatable bonds ≤ 10 0
  • TPSA ≤ 140 Ų 80.5
PAINS Clean

No PAINS structural alerts detected.

Chemical representations

Canonical representations for cheminformatics workflows.

SMILES 
c1nc(c2c(n1)[nH]c(n2)S)N
InChI 
InChI=1S/C5H5N5S/c6-3-2-4(8-1-7-3)10-5(11)9-2/h1H,(H4,6,7,8,9,10,11)
InChIKey 
BHVOFCPOXNYVCE-UHFFFAOYSA-N

Provenance

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

Method
LigQ nearest_k
Source
PDB
Binding sites
PF01149' 'PF06827' 'PF06831

External resources

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

Other ligands for this protein

Quick navigation to other ligands bound to KP13_03284.

PDB 6

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

Ligand PDB entry

ZINC 50

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

Compound Similarity (Tanimoto)