On 3/17/14, 9:57 PM, Ankita Nagpal wrote: > I have just started using modeller with the help of tutorial example.In > the aligning step when iam aligning 1bdm with TvLDH IAM getting error > only 317 residue out of 318 contain atom of type CA .

That's not an error, it's a warning. It means exactly what it says - one of your residues doesn't have a CA (C-alpha) atom in it. If your residues are all supposed to be amino acids, this can be an indication of a problem. But if you have a ligand in there, most likely it won't have a CA atom so all is fine.

Ben Webb, Modeller Caretaker