The OPM database currently includes all unique structures of transmembrane protein complexes and selected monotopic, peripheral proteins and membrane-bound peptides from PDB with their calculated membrane boundaries. OPM explores orientations of quaternary complexes formed by a number of interacting proteins, rather than orientations of individual subunits or domains. Different crystal structures of the same protein, including mutants, conformational states, or complexes with different ligands are indicated as related PDB enries. Some NMR models, low-resolution structures and theoretical models are not included.
Coordinate files of the proteins with calculated membrane boundaries are available for downloading separately for each protein or for a whole dataset. The coordinate files differ from original PDB entries: