Depending on what exactly you are looking for, you may try PDBeMotif: http://www.ebi.ac.uk/pdbe-site/pdbemotif/ PISA: http://www.ebi.ac.uk/msd-srv/prot_int/pistart.html Eugene On Wed, May 12, 2010 at 6:02 PM, gauri misra <[log in to unmask]> wrote: > Hi, > Which free online servers are best for calculation of non covalent > interactions present in several pdb structures? > Thanks for any insights provided by the community members... > > Cheers > GM >