Nucleic Acid Standards
Ideal Geometries
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.