text: user960: I looked up existing databases but ones like iPPI-DB or enter link description here either provide non-peptide inhibitors or only sequences. I need structures of proteins bound to other proteins, the latter of which is an inhibitor of the former, and the complex has a structure deposited in the PDB database. Here's an example: PDB:3U1J
  In case there is no existing database in literature, it'd be great even if I can screen for such PDB entries using some code, but I can't come up with an algorithm for it. Thank you!
  
  user266: The quickest way to screen the PDB database is Advanced Search from either RCSB or PDBe.
  Since you need entries with 2+ proteins you can set the number of protein chains to at least 2 in the RCSB search.  Or you can select "protein/protein complex" in Assembly composition in the PDBe search.
  It's less clear how to search for inhibitors. If you'd look for the "inhibitor" word in the molecule names you'd get (together with the previous criterium) 1200+ entries.
  
  
original_text: 960: <p>I looked up existing databases but ones like <a href="http://www.ippidb.cdithem.fr/" rel="nofollow noreferrer">iPPI-DB</a> or <a href="https://www.ebi.ac.uk/merops/inhibitors/" rel="nofollow noreferrer">enter link description here</a> either provide non-peptide inhibitors or only sequences. I need structures of proteins bound to other proteins, the latter of which is an inhibitor of the former, and the complex has a structure deposited in the PDB database. Here's an example: <a href="https://www.rcsb.org/structure/3U1J" rel="nofollow noreferrer">PDB:3U1J</a></p>
  
  <p>In case there is no existing database in literature, it'd be great even if I can screen for such PDB entries using some code, but I can't come up with an algorithm for it. Thank you!</p>
   266: <p>The quickest way to screen the PDB database is <em>Advanced Search</em> from either <a href="http://www.rcsb.org/" rel="nofollow noreferrer">RCSB</a> or <a href="https://www.ebi.ac.uk/pdbe/" rel="nofollow noreferrer">PDBe</a>.</p>
  
  <p>Since you need entries with 2+ proteins you can set the number of protein chains to at least 2 in the RCSB search.  Or you can select "protein/protein complex" in <em>Assembly composition</em> in the PDBe search.</p>
  
  <p>It's less clear how to search for inhibitors. If you'd look for the "inhibitor" word in the molecule names you'd get (together with the previous criterium) 1200+ entries.</p>
  
  <p><a href="https://i.stack.imgur.com/O8mu5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/O8mu5.png" alt="RCSB advanced search"></a></p>
  