The question was: "Can anyone tell me how to do move_fragment on my ligand ? My inhibitor atoms don't move; O always says:
"IP4 (my inhibitor name) has no dictionary".
Could somebody teach me how to do this ?"
I wouldn't use move_fragment unless all else fails (the same is true for move_atom). Try the following instead:
in this fashion, you keep good bond lengths, angles and most dihedrals plus the stereo-chemistry will be retained (with move_fragment you could easily change an R into an S stereo-isomer without intending to do so !)
Alwyn added: "O has a database that describes how atoms within a particular residue type are too be treated by move_frag. If the residue type is AXR it might look like the following
rsr_dict_axr t 3 70 c1 c2 c3 c4 c5 c6 c7 c8 c9
clicking on C5 would then let you move the 3 atoms C4,C5,C6. Look at the distributed rsr_dict.o files"