Ligand profile

4HQ

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

Bound to: KP13_02423 — tRNA (guanine-N(1)-)-methyltransferase

Via homolog PDB 4yqr UniProt P43912 Formula C₈H₁₃N₅O₂
Mol. weight 211.22 Da
Permeability High
PAINS Clean

Identifiers

Database identifiers and provenance.

Ligand ID
4HQ
PDB
4yqr
UniProt (similar protein)
P43912
Target protein
KP13_02423

Structure

2D representation rendered from SMILES.

Physicochemical properties

Computed with RDKit from SMILES.

Molecular weight 211.22 Da
LogP (Crippen) -0.96
H-bond donors 1
H-bond acceptors 6
TPSA 88.49 Ų
Rotatable bonds 1
Aromatic rings 1 / 2
Heavy atoms 15
Fraction sp³ C 0.62
Formula C₈H₁₃N₅O₂

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 88.5
  • −1 ≤ LogP ≤ 5 -0.96
Lipinski's Rule of Five Pass 0 violations
  • MW ≤ 500 Da 211.2
  • LogP ≤ 5 -0.96
  • H-bond donors ≤ 5 1
  • H-bond acceptors ≤ 10 6
Veber's rules Pass
  • Rotatable bonds ≤ 10 1
  • TPSA ≤ 140 Ų 88.5
PAINS Clean

No PAINS structural alerts detected.

Chemical representations

Canonical representations for cheminformatics workflows.

SMILES 
CN1CCN(CC1)C(=O)c2c(non2)N
InChI 
InChI=1S/C8H13N5O2/c1-12-2-4-13(5-3-12)8(14)6-7(9)11-15-10-6/h2-5H2,1H3,(H2,9,11)
InChIKey 
KQKPEPOSSQPUOT-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
PF01746

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_02423.

PDB 88

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

Ligand PDB entry

ChEMBL 38

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)