1AF1

1AF1 is a four-character accession code used by the Protein Data Bank (PDB) to identify a specific deposited biomolecular structure. PDB IDs are unique alphanumeric identifiers assigned to structure entries and are widely used to reference three-dimensional models of macromolecules.

Entries like 1AF1 describe structures that may involve proteins, nucleic acids, or complexes, and can include information about chains, ligands, cofactors, and biological assemblies. The data typically contain atomic coordinates, experimental metadata, and validation notes, enabling researchers to study the geometry and organization of the biomolecule.

The structure associated with 1AF1 was determined using experimental methods such as X-ray crystallography, nuclear magnetic resonance spectroscopy, or cryo-electron microscopy. The entry records the method used, resolution when applicable, and quality indicators that help assess the reliability of the structural model.

Researchers cite 1AF1 when discussing structural features such as active sites, binding pockets, or conformational states, and they frequently compare it with related structures to draw functional inferences or to model interactions with ligands.

Public access to 1AF1 is provided through the RCSB Protein Data Bank and other wwPDB partners. Coordinates are available in standard formats (PDB or mmCIF) along with supporting files such as validation reports, experimental details, and biological assembly information.

The PDB began as an international collaboration to archive macromolecular structure data for the scientific community, and four-character IDs like 1AF1 have been in use for decades to enable precise retrieval and cross-referencing of individual structures.