Nucleic Acid Standards
Orthogonal coordinates for DNA and RNA monomers derived from the standard distances and angles that are described by Gelbin et al. (Geometric Parameters in Nucleic Acids: Sugar and Phosphate Constituents. Anke Gelbin, Bohdan Schneider, Lester Clowney, Shu-Hsin Hsieh, Wilma K. Olson, and Helen M. Berman. (1996), J. Am. Chem. Soc., 118, 519-529.) and Clowney et al. (Geometric Parameters in Nucleic Acids: Nitrogenous Bases. Lester Clowney, Shri C. Jain, A. R. Srinivasan, John Westbrook, Wilma K. Olson, and Helen M. Berman. (1996), J. Am. Chem. Soc., 118, 509-518.)
The coordinates were derived by optimizing the valence and torsion angles with respect to the standard values in the X-PLOR files . The root mean square devations for bond distances were <0.001 angstroms; for bond angles, <0.3 degrees; and for dihedral angles, <0.8 degrees.