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The missing residues/atoms in the PDB file can be found out and  fixed in Schrödinger program's Prime module refinement.It will automatically detect the missing atoms in a residue and will fix it. After fixing it can energy minimize it.For missing portions of residue it can build the missing portions using homology model.The other option for fixing missing atoms is to use the following server:
http://lorentz.immstr.pasteur.fr/pdb/frozen_submission.php


-Debayan Dey
 
On Wed, May 30, 2012 at 5:20 PM, sreetama das <[log in to unmask]> wrote:
Dear All,
              I have a PDB file which does not have the REMARKS cards 465 (for missing residues) and 470 (for missing atoms). This is not a deposited PDB file. Is there any program to figure out the missing residues and atoms (some programs complain about missing atoms) ? Or do I have to check in any particular file generated during the processing of the diffraction data? The S2C program from Prof. Dunbrack's Lab does not show any option of uploading pdb files (this solution was mentioned to a previous query on the BB).
            Thanks in advance,
sreetama


--
Debayan Dey
Research Fellow
Dept. of Physics,
Biocrystallography and Computational Biology Laboratory
Indian Institute of Science
 India