Dear all,

I am trying to create distance restraints in a model based on an example script from the modeller manual named model-addrsr.py . I am following the exact same syntax of this script, yet I need to change the numbering of my residues (since my restraints are for a model that starts at residue 2 and not 1) so I add another restraint to renumber it (self.rename_segments), however, when I try to use my new script (listed at the bottom of this mail), I get an error message that the atom I listed OG1:132A:A does not exist: 'No such atom: OG1:132A:A', does anyone know what am I doing wrong here?

Thank you, Doran

My script:

# Homology modeling by the automodel class from modeller import * # Load standard Modeller classes from modeller.automodel import * # Load the automodel class

log.verbose() # request verbose output env = environ(rand_seed = -500) # create a new MODELLER environment to build this model in env.io.atom_files_directory = './:' # directories for input atom files env.io.hetatm = True # read HETATM records (for Na ions)

################################ # define the modeling parameters class mymodel(automodel): def special_restraints(self, aln): self.rename_segments (segment_ids=('A'),renumber_residues=(2)) rsr = self.restraints at = self.atoms rsr.add(forms.gaussian(group=physical.xy_distance,feature=features.distance(at['OG1:132A:A'],at['NA:310A:A']),mean=2.4, stdev=0.1))

def user_after_single_model(self): self.rename_segments (segment_ids=('A'),renumber_residues=(2))

a = mymodel(env, alnfile = 'file.pir', # alignment filename knowns = ('No_anis'), # codes of the templates sequence = ('target')) # code of the target in the pir file

a.starting_model= 1 # index of the first model a.ending_model = 1 # index of the last model # (determines how many models to calculate) a.deviation = 2.0 # Deviation in models #a.md_level = refine.very_slow a.make() # do the actual homology modeling