I was successfully able to change a few atom types using the setattr command.

I checked to see that the atoms I changed were correct (by selecting the atoms and then then clicking the IDATM type option.)

I saved the .pdb file

When I opened up the saved .pdb file and checked the atom types, they had reverted back to their original type. 

Is there a specific way to save files after using setattr command?

Regards,

Juliette Cao

University of Houston