Rex: COOT->Extensions->Modeling...->Reorder Chains... But be forewarned that if the PDB file has insertion residue numbering this process will strip the insertion residue character from the ATOM records, so the file will end up with multiple residues with the same apparent residue number. Steven From: Mailing list for users of COOT Crystallographic Software [mailto:[log in to unmask]] On Behalf Of Rex Palmer Sent: Tuesday, January 20, 2015 11:54 AM To: [log in to unmask] Subject: Reordering chains in a pdb file My protein has 4 separate chains A,B,C and D but the pdb file has the chains in order C,D,A,B. Is there any existing software that would rearrange my pdb file as A,B,C,D? Rex Palmer http://www.bbk.ac.uk/biology/our-staff/emeritus-staff ________________________________ This message (including any attachments) may contain confidential, proprietary, privileged and/or private information. The information is intended to be for the use of the individual or entity designated above. If you are not the intended recipient of this message, please notify the sender immediately, and delete the message and any attachments. Any disclosure, reproduction, distribution or other use of this message or any attachments by an individual or entity other than the intended recipient is prohibited.