When loading
mmCIF structure files, the
cif_use_auth setting (default: on) controls whether the
auth_* fields are used or not.
New in PyMOL 1.7.8
With the PDBx/mmCIF format, the PDB introduced new residue and chain numbering schemes. The numbering which is found in PDB files is available in mmCIF files from the auth_* fields. The new numbering, which for example has no insertion codes and strictly increments residue numbers, is available from the label_* fields. For compatibility with PDB files, PyMOL by default will read the auth_* fields (if available, with fallback to label_* fields).
Note that _atom_site.label_asym_id is always loaded into the segi field, independant of the cif_use_auth setting.
Note that non-polymer molecules (e.g. water) are not enumerated by _atom_site.label_seq_id and will appear as a single residue in PyMOL (sequence viewer, when making selections, etc.) with cif_use_auth=off.
== Currently affected fields ..→