GaussView can open PDB files with a variety of options, including:

• Load one or more structures from a multistructure PDB file
• Add hydrogens
• Load biological unit or asymmetric unit

PDB data can be viewed via the Atom List Editor, PDB Residue Editor and PDB Secondary Structure Editor accessible from the Edit menu.

The protonation states of residues can be easily edited in the PDB Residue Editor.

PDB data loaded from a PDB file can be saved to a Gaussian job file.  Gaussian will pass PDB information in a Gaussian job file to the corresponding log and chk files and this data will automatically be loaded by GaussView.

GaussView can write a PDB file for any molecule.  If the molecule contains PDB residue and secondary structure data, then this will automatically written to the PDB file.