The server assigns 18 conformers based on the values of their backbone torsion angles.
- Table defining the conformers is below and Cartesian coordinates of their representative samples can be downloaded.
- The conformers consist of three BI-forms, two BII-forms, three A-forms, three Z-forms, four mixed A/B forms, and three conformers with bases in the syn orientation.
- Conformationally extreme conformers are not assigned to any of the above; these steps formally represent the 19th conformer.
- More information about the conformers and the ways how the conformers were identified can be found in the paper by Svozil et al., Nucleic Acids Research, 36, 3690 (2008).
Please, read before you upload coordinates of your DNA:
- DNA steps are identified based on atom names as defined by the PDB format, version 3.1 or above (sugar atoms as O4' not O4*).
- Steps with non-standard or missing atoms that define torsions δ ... δ+1, χ, and χ+1 are not considered in the assignment process.
- Conformers are assigned for modified residues that contain standard names for atoms defining the step torsions between δ and δ+1 and χ and χ+1.