Ligand profile

CO2

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

Bound to: KP13_01375 — Uroporphyrinogen decarboxylase

Via homolog PDB 1r3q UniProt P06132 Formula CO₂
Mol. weight 44.01 Da
Permeability High
PAINS Clean

Identifiers

Database identifiers and provenance.

Ligand ID
CO2
PDB
1r3q
UniProt (similar protein)
P06132
Target protein
KP13_01375

Structure

2D representation rendered from SMILES.

Physicochemical properties

Computed with RDKit from SMILES.

Molecular weight 44.01 Da
LogP (Crippen) -0.58
H-bond donors 0
H-bond acceptors 2
TPSA 34.14 Ų
Rotatable bonds 0
Aromatic rings 0 / 0
Heavy atoms 3
Fraction sp³ C 0.00
Formula CO₂

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 34.1
  • −1 ≤ LogP ≤ 5 -0.58
Lipinski's Rule of Five Pass 0 violations
  • MW ≤ 500 Da 44.0
  • LogP ≤ 5 -0.58
  • H-bond donors ≤ 5 0
  • H-bond acceptors ≤ 10 2
Veber's rules Pass
  • Rotatable bonds ≤ 10 0
  • TPSA ≤ 140 Ų 34.1
PAINS Clean

No PAINS structural alerts detected.

Chemical representations

Canonical representations for cheminformatics workflows.

SMILES 
C(=O)=O
InChI 
InChI=1S/CO2/c2-1-3
InChIKey 
CURLTUGMZLYLDI-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
PF01208

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_01375.

PDB 2

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

Ligand PDB entry

ZINC 1

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

Compound Similarity (Tanimoto)