Sequence(s)
You can input one or two sequences. ProtCID assigns Pfams to the query sequence(s) using the results
of the web service provide by Pfam, then shows the likely Pfam domains in a table.
If two sequences are input, two tables are returned. Click the button "View Pfam Arch in PDB" to
display the table of all entry architectures that are in the PDB that contain one or more of the Pfam
domains in the query. If two sequences are input, the table contains pair architectures that contain
at least one Pfam domain of the first sequence and one Pfam domain of the second sequence.
As an example, input a HIV integrase sequence:
the image below shows the result page:

Click the button "View Pfam Arch in PDB", and a table appears that lists the Pfam architectures of all entries that contain the Pfam and the number of PDB entries for each:

Click one of the Pfam architectures, for instance "rve", and the interface clusters are returned. The common interface in cluster 1 is present in all 11 crystal forms and 39 entries:

Expanding the table with the "[+]" button shows that the interface occurs in 4 different entry architectures.
The Pfam architecture of 1C6V is (integrase);(rve), 2B4J is (LEDGF);(rve) and 1BI4 have two chains with same family.
7 PDB biological units and 12 PISA biological assemblies are missing this interface.