for researcher M.S.Chang
these tools might help.

ex:
String http://string.embl.de/
input sequence, get "predict functional associations proteins/genes"
supported by microarray, textmining, Co-occurrence, etc.

IntAct http://www.ebi.ac.uk/intact/index.html
input gene, it will give you proteins interact with the given gene.
supported by Experiments.

InterDom
input sequence, it will give you putative domain interactions
for example, it will give you some domains which has complexes with domain in given sequence (derived from PDB), or has protein interactions with domain in given sequence (derived from DIP).