“Bioinformatics.org” hosts a nice GUI-based PDB file editor. The program is written in Java and can run on MS-Win, Linux and Mac OS. Some snapshopts are showing here. I think this is a very friendly program for users who don’t know how to use shell script to change/reset PDB parameters (e.g. chain ID, beginning number of first residue/atom, remove of heavy atom/water..etc..)
Protein Data Bank (PDB) file editor: web address (http://www.bioinformatics.org/pdbeditor/wiki/Main/HomePage)
Snapshot 1: target protein coordinate is loaded.
Snapshot 2: the editor window, I reset the beginning residue at 30, and the new ChaiInID is “C”
snapshot 3: the result of new coordinate