[ccp4bb]: bond parameters - na

[Celeste MacElrevey]

Hello,   I was wondering if anyone could direct me to the source reference for nucleic acid bond lengths used in the dna.dic file, or any other nucleic acid parameter files referenced during refinement in CCP4 (Refmac, etc.).  I am comparing parameters between O, CNS and CCP4, most of which vary above and beyond the esd.  The most current reference I can find is that used in CNS: Berman, HM (1996) ActaCryst D52, 57-64 - based on an averaging of high res. structures from CambridgeSD and NucleicAcidDB.  Any suggestons are highly appreciated.   Sincerely, Celeste     Celeste M. MacElrevey, Doctoral Candidate Department of Biochemistry and Biophysics, Box 712 University of Rochester, School of Medicine and Dentistry 601 Elmwood Ave. Rochester, NY 14642 (585) 276-0346