Why use PDB Correlator as a QC tool?

After an experiment on a Fida 1, you can use the PDB correlator as an orthogonal method of validating the state of your protein. If the Fida 1 results and the PDB correlator agrees, you then you have the oligomeric state of your protein confirmed. If it differs you know that your protein in solution behave differently compared to the crystal structure. Read more here.