protein structure visualisation - (Apr/29/2014 )

Can somebody recommend me a software which can assembly, stick a predicted pretein in a homotrimer form, which may be the naturel form of that protein. The structure is predicted in monomer form and it is in a pdb file format but and I want to visualize correctly, in trimer for which may be the naturel form of that protein.

Thanks for every helps and tips. 

maybe one of the software packages linked on this expasy page?

Thanks for the quick and useful answer. That portal is a really good starting point.

Sorry for the late reply. You can use the MakeMultimer server (or download the Python script for a local run) to generate a PDB with biologically relevant composition - providing that the PDB file in question contains the BIOMT transformation matrix.

Link: http://watcut.uwaterloo.ca/tools/makemultimer/