How to model DNA binding protein

How can I include the DNA structure when modelling a DNA binding protein? Can I just include the HETATM atoms using SET MODEL_TOPOLOGY = 1, HETATM_IO = on This doesn't seem to work, what else to need to include? Michael Buck ************************************************ Michael Buck NCSU Genetics mjbuck@unity.ncsu.edu Phone (919)515-5759 Fax (919)515-3355 http://www4.ncsu.edu/~mjbuck *************************************************