The following two tables include structures with 6 or more base pairs given sigma2(straight line) is smaller than the corresponding values of the competing models.

• Table 1: Structures with a straight-line helical axis. Sigma2 of a straight line is significantly smaller (> 0.2) than sigma2 of the next best model. This Table includes 177 structures.
  • Table 1a: listed by number of base pairs (bp) (HTML | TXT)
  • Table 1b: listed by sigma2 (straight line) (s(2)) (HTML | TXT)

• Table 2: Structures with a straight-line helical axis. Sigma2 of a straight line is only slightly smaller (< 0.2) than for the next best model(s)). This Table includes 136 structures.
  • Table 2a: listed by number of base pairs (bp) (HTML | TXT)
  • Table 2b: listed listed by sigma2 (straight line) (s(2)) (HTML | TXT)

For structures with 6 base pairs the straight line is the only geometrical model that can be fitted. In these cases sigma2 (straight line) has to be analyzed in order to decide whether or not a straight line is really a good description of the helical axis. Three duplex structures with straight helical axes are shown below as examples. More detailed visual and other information for all structures can be obtained from the links given in the Tables.

Abbreviations

Nucleic Acid Bending Classification Home Page