The scripts in fortran90 for calculating helix handedness using the chirality index can be downloaded from this GitHub repository.
In the tar archive you will find separate scripts for calculating:
- the chirality indexes for a protein structure in pdb format (file chirality.f90). The chirality indexes easily detects left-handed helixes of Poly-Proline II with respect to the right-handed helixes as alpha-helixes.
- The chirality indexes for a nucleic acid structure in pdb format (file chirality_nucleic.f90). A, B and Z form are identified.
- The chirality indexes for any macromolecule coordinates in NAMD dcd format (chirality_dcd.f90).
- A documentation file with all the detailed steps.
Please feel free to send any emails for any kind of queries or suggestions to improve these scripts to apietropaolo”at”unicz.it