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2015-10-19T01:04:43Z

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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 [http://mmcif.wwpdb.org/ 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 ==

* _atom_site.auth_atom_id (ID)
* _atom_site.auth_comp_id (resn)
* _atom_site.auth_seq_id (resi)
* _atom_site.auth_asym_id (chain)
* _atom_site.pdbx_pdb_ins_code (resi suffix)

== Examples ==

"auth" versus "label" asym_id of 1oky:

PyMOL>set cif_use_auth
PyMOL>fetch 1oky, authon, async=0
PyMOL>get_chains authon
cmd.get_chains: ['A']

PyMOL>set cif_use_auth, off
PyMOL>fetch 1oky, authoff, async=0
PyMOL>get_chains authoff
cmd.get_chains: ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K']

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