To explore the interactions within or between proteins in a complex structure please check out the webserver link given in,
PIC: Protein Interactions Calculator, Nucleic Acids Research, 2007, Vol. 35, Web Server issue W473–W476. PMID:17584791
[or google Protein Interactions Calculator]
Protein Interactions Calculator (PIC) is a webserver which is used to explore interactions within a protein or between proteins in a complex. All the interactions and bonds can be seen in a single site and also the identified interactions/bonds between residues can be visualized using a RasMol and Jmol interface. The input should be in the Protein data bank(.pdb) format.