Hi George,

perhaps there are several instances of atom name N in your model. You need to be more specific, for example:

chain A and resseq 123 and name N

This selects atom N in residue number 123 in chain A. If there are alternative conformation, you need to be even more specific:

chain A and resseq 123 and name N and altloc B

Pavel

Hi, 

I was trying to restrain the N-CA-C angle to 110.0

I updated the .def file as follows:

 angle {
      action = *add 
      atom_selection_1 = name N
      atom_selection_2 = name CA
      atom_selection_3 = name C
      angle_ideal = 110.0
      sigma = 2

I got the following:
Sorry: More than one atom selected: "name N"
  Number of selected atoms: 86

I tried using N in quotes and it doesn't work either but the example in the website had this(below), what am I doing wrong?
resname ALA and (name ca or name c or name n or name o)
Thank you

          

          

        

      

      

      

      

      
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