Dear All: Thanks for the overwhelming suggestions. I had in fact used SSBOND. However, there were other sugestions which are listed below.
ssbond: http://eagle.mmid.med.ualberta.ca/forms/ssbond.html disulfide by design: http://www.ehscenter.org/dbd/ http://www.predictprotein.org/ - have not checked yet http://contact.ics.uci.edu/bridge.html - DIPro Some useful references were also provided Sowdhamini R, Srinivasan N, Shoichet B, Santi DV, Ramakrishnan C, Balaram P. Protein Eng. 1989 Nov;3(2):95-103 There is also a sequel to this paper in 2003. Thanks again Subbu
