MMTF—An efficient file format for the transmission, visualization, and analysis of macromolecular structures
Fig 7
Comparison of the gzipped file sizes for the PDB archive (~127,000 entries) in PDBx/mmCIF, PDB, and MMTF formats as of March 2017.
About 500 large structures (> 99,999 atoms or > 62 chains) cannot be represented in the PDB format, however, they are available as split PDB files (.tar.gz files) and take up about 2.7 GB, which is included in the reported PDB file size. For MMTF, we report the size of the all atom representation (MMTF-full) and the reduced representation (MMTF-reduced).