The Worldwide Protein Data Bank (wwPDB) consists of organizations that act as deposition, data processing
and distribution centers for PDB data.1
RCSB PDB (USA),
PDBe (Europe) and
and BMRB (USA).
The wwPDB's mission is to maintain a single PDB archive of macromolecular structural data
that is freely and publicly available to the global community.
Inclusion of Large Structures in the Main PDB Archive
The wwPDB recently combined entries that represent large structures (such as ribosomes) across multiple PDB files (SPLIT entries) into single files. These combined structures have been issued new PDB IDs and are represented in the archive in both PDBx/mmCIF and PDBML formats.
1. H.M. Berman, K. Henrick, H. Nakamura (2003):
Announcing the worldwide Protein Data Bank. Nature Structural Biology 10 (12), p. 980