Since February 01 2023, the wwPDB enriches PDB entries with additional annotation and distributes the latest versions of each entry via next generation archive (NextGen) accessible at https://files-nextgen.wwpdb.org and its mirrors in the USA, UK and Japan.
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This enriched PDB archive provides annotation from external database resources in the metadata that is in addition to what is in the structure model files in the PDB main archive, https://files.wwpdb.org. For example, the sequence annotation from external resources such as UniProt, SCOP2 and Pfam are provided at atom, residue, and chain levels: _pdbx_sifts_unp_segments and _pdbx_sifts_xref_db_segments for each segment, _pdbx_sifts_xref_db at residue level, and _atom_site at the atom level.
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These directories are grouped under a 2-character hash from the two penultimate characters of the PDB code (last character minus 2 and last character minus 1). For example, the hash would be "ab" for PDB entry "pdb_00001abc"):
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File names in the NextGen archive conform to a similar naming scheme as versioned archive with a tag “enrich” to identify the source of PDB archives:
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