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Hello, I'm refining a structure containing DNA and noticed that the C5 methyl group of Thymidine isn't being held planar with the rest of the ring. Looking at the restraints file Td.cif, I see that C5M isn't included in the list of planarity constraints. I added the following as the last line in the file: Td plan C5M 0.020 After refining the structure with C5M listed as part of the planar ring, all the C5-Methyls in my structure now appear planar with the rest of the ring. Should Td.cif be changed to include C5M in the list of planar atoms? Thanks, Morri -- Morri Feldman (415) 514-0575 Shokat Lab UCSF Biophysics Program
