[wwPDB] Distribution of Electron Microscopy metadata in PDBx/mmCIF file format

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At the beginning of October 2023, the Electron Microscopy Data Bank (EMDB) will start distributing electron microscopy (EM) metadata for its entries in PDBx/mmCIF file format alongside the already available XML formatted files. The addition of PDBx/mmCIF files in the archive will bring parity between EMDB and PDB (EM experimental data vs 3D structures) in the way metadata is served while improving the consistency and interoperability between the two archives. EMDB entries released before October 2023 will have PDBx/mmCIF files added at a later date. The description of PDBx/mmCIF categories and items featured in EM metadata files can be found in the PDBx/mmCIF dictionary (https://mmcif.wwpdb.org/dictionaries/mmcif_pdbx_v50.dic/Groups/em_group.html). For an EMDB entry EMD-xxxxx, PDBx/mmCIF file name will be emd-xxxxx.cif.gz and it will be located in the entry's subfolder called metadata (EMD-xxxxx/metadata) in the wwPDB archive repositories:

EMDB: https://ftp.ebi.ac.uk/pub/databases/emdb/structures/
wwPDB: https://files.wwpdb.org/pub/emdb/structures/
RCSB PDB (US): https://files.rcsb.org/pub/emdb/structures/
PDBe (UK): https://ftp.ebi.ac.uk/pub/databases/emdb/structures/
PDBj (Japan): https://files.pdbj.org/pub/emdb/structures/

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Created: 2023-10-04