Appu kumar wrote:
Dear all, Please guide me on right track in weired confusion. I have model structure(available in pdb) and a structure solved by molecular replacement as a dimer . Our structure does not giving correct tetramer by symmetry mates. Strangely when i am aligning our structure on model structure and generating symmetry mates of our structure to find the correct tetramer from dimer, i am getting the one which i want. Why the structure solved by us give tetramer on aligning with model structure. I do not know weather it is a right way to find the correct oligomeric state of protein or not. So please i reaquest you to suggest me with your valuable advice to overcome with this confusion. Thank you in advance Appu
After transforming your solution dimer back to the position in the structure from which you got the model, then applying NCS gives the proper tetramer? Is this using the cell and spacegroup of the original model, or your cell and space group? If the former, then it is not surprising but it doesn't tell you anything about the arrangement in your new structure.