Hi Sheena, ChimeraX does not distinguish protein helix subtypes, they are all just "helix". The only choices of the ss_type attribute are helix,strand,coil: <https://rbvi.ucsf.edu/chimerax/docs/user/attributes.html#residue> Currently ChimeraX (and Chimera) lose some of the secondary structure information when they write out PDB files, e.g. non-alpha HELIX types, sheet membership of strands, etc. Sorry about that. You would have to copy the original HELIX record and use it to replace the one in the written-out file. I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Chimera(X) team Department of Pharmaceutical Chemistry University of California, San Francisco

On May 3, 2021, at 3:01 PM, Sheena Vasquez <vasquezs@mit.edu> wrote:

Hi everyone,

I was wondering if there's a way to reassign alpha-helices to 3.10 helices in chimeraX? I've been using the setattr /A:###-### res ss_type 1 command, but it seems as if there's only the option to assign alpha helices (ss_type 1). If I try ss_type 5 (5 is the assigned number for 3.10 helices in the pdb), the helix is lost. Any help with this is greatly appreciated!

Take care, Sheena _______________________________________________ ChimeraX-users mailing list ChimeraX-users@cgl.ucsf.edu Manage subscription: https://www.rbvi.ucsf.edu/mailman/listinfo/chimerax-users