Resolved chemical identity

PHOSPHATE ION

Other PDB component · not a studied ligand

complete_deposited_InChIKey

0 assay / association records0 preparations0 research-ligand PDB entries

No deposited PWWP research-ligand geometry is classified for this preparation in the selected release. Deposition of a buffer/ion is not binding evidence.

Clinical / development status: Not independently curated. A chemical probe classification does not imply medicinal approval.

Identity is separate from preparation

Chemical identity

Stable identity: INCHIKEY:NBIIXXVUZAFLBC-UHFFFAOYSA-K
Full InChIKey: NBIIXXVUZAFLBC-UHFFFAOYSA-K
Source identity status: complete deposited InChIKey
Deposited CCD identifiers: PO4
External identifiers: See deposited identity and source links

Reference formula: O4P-3
Calculated molecular weight: 94.97
Calculated descriptors: cLogP -2.8246 · TPSA 86.25 Å² · HBD 0 · HBA 4RDKit 2025.09.3; calculations for this source identity, not experimental measurements.
Depiction validation: verified smiles full inchikey match

SMILES, InChI & complete identity record

Isomeric SMILES: [O-]P(=O)([O-])[O-]
InChI: Not curated

{
  "aliases": [
    "PHOSPHATE ION"
  ],
  "ccd_ids": [
    "PO4"
  ],
  "ccd_names": "[\"PHOSPHATE ION\"]",
  "ccd_types": "[\"non-polymer\"]",
  "chemical_id": "INCHIKEY:NBIIXXVUZAFLBC-UHFFFAOYSA-K",
  "connectivity_block": "NBIIXXVUZAFLBC",
  "curated_source_sha256": null,
  "curation_version": "frozen-v1.2",
  "external_identifiers": {},
  "formal_charge_by_ccd": "{\"PO4\": -3}",
  "formulae": "[\"O4 P\"]",
  "geometry_note": "CCD ideal SDF is a reference chemical geometry, not a deposited bound pose.",
  "identity_status": "complete_deposited_InChIKey",
  "inchikey": "NBIIXXVUZAFLBC-UHFFFAOYSA-K",
  "inventory_origin": "v1_CCD_inventory",
  "isomeric_smiles": "[O-]P(=O)([O-])[O-]",
  "primary_name": "PHOSPHATE ION",
  "retrieval_date": "2026-10-24",
  "smiles_stereo_by_ccd": "{\"PO4\": \"[O-]P(=O)([O-])[O-]\"}",
  "source_metadata_sha256": "{\"PO4\": \"f9fbab7b35db10602b9bff92c5696734f82d156c24a8182a1b628ba85ab79315\"}",
  "source_urls": [
    "https://www.rcsb.org/ligand/PO4"
  ]
}

Measured target and original context

Bioactivity & experimental observations

Download assay CSV

Each row is one source-specific observation. Repeated measurements of this compound are not independent compounds. Direct binding, functional displacement and cellular outcomes retain their distinct endpoints.

Preparation	Tested target & construct	Method / endpoint	Original observation	Conditions & uncertainty	Source & verification
No observations match these filters. Missing curation is not evidence of biological inactivity.

Exact deposited instances

Experimental structures

Native-core and broader Pfam proximity are distinguished from contacts elsewhere in a protein. Each action opens the actual deposited ligand instance. Geometric proximity does not supply a measured binding affinity.

Entry / ligand	Native domain & protein chain	Geometric evidence	Minimum distance	Inspect
4N4G · PO4PDB:4N4G:LIG:C:PO4:402:.	Zmynd11 PWWP1Protein label chain A · ligand label chain C	native annotation core contaction/additiveion or salt · other component. Deposited geometry is not solution affinity.	Core: 2.5485 Å Pfam: 2.5485 Å	View deposited instance
4N4H · PO4PDB:4N4H:LIG:D:PO4:402:.	Zmynd11 PWWP1Protein label chain A · ligand label chain D	native annotation core contaction/additiveion or salt · other component. Deposited geometry is not solution affinity.	Core: 2.3583 Å Pfam: 2.3583 Å	View deposited instance
4N4I · PO4PDB:4N4I:LIG:D:PO4:402:.	Zmynd11 PWWP1Protein label chain A · ligand label chain D	native annotation core contaction/additiveion or salt · other component. Deposited geometry is not solution affinity.	Core: 2.635 Å Pfam: 2.635 Å	View deposited instance

Preparations, identities and controls remain separate

Experimental context

No measured preparation is linked to this deposited identity in the curated snapshot.

Provenance and reproducibility

Sources & downloads

https://www.rcsb.org/ligand/PO4

Download complete evidence JSON Curation methods & source receipts

Snapshot 2026-10-26 · phase5-1.0.0 · original measurements, operators, constructs and uncertainty are retained in the exports.