simple model for flexible ligand!



  Hi,
    I want to develop a simple flexible model for my ligands - not all atom
  model. This is to study steric interactions between that model and
  all atom protein. I came accross the 'rod modeling of DNA' - is there
  anything for large/long flexible ligands? Any suggestion/pointer would
  be highly appreciated.
                  Pradipta
  Dr. Pradipta Bandyopadhyay
  Dept. of Pharmaceutical Chemistry
  University of California, San Francisco (UCSF)