Current version: OL24 DNA force field (OL24 DNA force field, including OL3 RNA force field)

Refinements on top of ff99 force field:


DNA
χOL3 refinement of glycosidic torsion chi (replaces χOL4 used in OL15 and OL21) [4]
εζOL1 refinement of eps/zeta torsions [7]
βOL1 refinement of beta torsion [8]
αγOL21 refinement of alpha/gamma torsions [16]
POL24 refinement of sugar pucker [18]
RNA
χOL3 correction for RNA glycosidic torsion chi [4,5]

AMBER:

ff-DNA-OL24 may be downloaded here

Parameters may be read into tLEaP using command: tleap -s -f leap-ff-nucleic-OL24.in

Files are prepared for use with AMBER16/AmberTools16 (and newer). Note that all downloaded files should be placed in the current directory (from which tLEaP was launched) or you should define the path to these in leap-ff-nucleic-OL24.in