Thanks Joseph and Thomas for your replies. When I use the "as cartoon" commands, all my molecule disappear. My *pdb file could be the problem as it is a *cif crystal structure file (converted with mercury) from the cambridge crystal data.
Hi Baptiste,are you sure? What happens if you try this:
I have a small helical pseudopeptide with mixed alpha and beta amino-acids. How can I make a cartoon representation of this helix with Pymol? For the moment, I have selected the peptide backbone atoms and tried the "alter" command to force pymol to recognize the helix but it do not work.
alter all, ss='H'
MPI for Developmental Biology