Ligand profile

ET

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

Bound to: KP13_03630 — Acriflavine resistance protein B

Via homolog PDB 7kgg UniProt Q2FD70 Formula C₂₁H₂₀N₃⁺
Mol. weight 314.41 Da
Permeability High
PAINS Alert

Identifiers

Database identifiers and provenance.

Ligand ID
ET
PDB
7kgg
UniProt (similar protein)
Q2FD70
Target protein
KP13_03630

Structure

2D representation rendered from SMILES.

Physicochemical properties

Computed with RDKit from SMILES.

Molecular weight 314.41 Da
LogP (Crippen) 4.13
H-bond donors 2
H-bond acceptors 2
TPSA 55.92 Ų
Rotatable bonds 2
Aromatic rings 4 / 4
Heavy atoms 24
Fraction sp³ C 0.10
Formula C₂₁H₂₀N₃⁺

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 55.9
  • −1 ≤ LogP ≤ 5 4.13
Lipinski's Rule of Five Pass 0 violations
  • MW ≤ 500 Da 314.4
  • LogP ≤ 5 4.13
  • H-bond donors ≤ 5 2
  • H-bond acceptors ≤ 10 2
Veber's rules Pass
  • Rotatable bonds ≤ 10 2
  • TPSA ≤ 140 Ų 55.9
PAINS Alert

Matches PAINS filter: het_pyridiniums_A(39). May be a frequent false positive in HTS — review carefully.

Chemical representations

Canonical representations for cheminformatics workflows.

SMILES 
CC[n+]1c2cc(ccc2c3ccc(cc3c1c4ccccc4)N)N
InChI 
InChI=1S/C21H19N3/c1-2-24-20-13-16(23)9-11-18(20)17-10-8-15(22)12-19(17)21(24)14-6-4-3-5-7-14/h3-13,23H,2,22H2,1H3/p+1
InChIKey 
QTANTQQOYSUMLC-UHFFFAOYSA-O

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
PF00873

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_03630.

PDB 33

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

Ligand PDB entry

ChEMBL 53

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)