# Delete chains from a protein

We have a docking target protein with multiple chains (A,B and C). However, I just need chain A. How can I delete the 2 other chains from the docking target protein.

• Hi @ibio_rep1, sorry to be persistent but please remember to accept one of the answers below. I didn't know about the pdb tools and its useful trick to know. It is important for the momentum of the site. Both respondees are serious structural bioinformaticians. – M__ Aug 17 '20 at 17:03

If the tag r is incorrect, the easiest way is to download and install PyMOL: https://pymol.org/2/
Drap and drop your pdb file and type remove not chain A. Then save molecule via the menu as pdb or type save some_file_name.pdb (will be in your home root folder).
pdb_selchain -A prot.pdb > prot_A.pdb