Hi James,
Is this somehow a modified version of 5byl?  I don't get this error with 5byl in the 1.2.5 release, though I am using Mac and not Linux (shouldn't matter AFAIK).  At any rate, try getting the daily build and trying that.  It has some fixes related to adding hydrogens to structures with alt locs.

--Eric

Eric Pettersen
UCSF Computer Graphics Lab


On Jul 27, 2021, at 9:54 PM, James Loy via ChimeraX-users <chimerax-users@cgl.ucsf.edu> wrote:

Hi folks-

I'm trying to add hydrogens to an mmCIF file (5byl) using the addh command. However, every time I try, I encounter the following error:

Traceback (most recent call last):
  File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/ChimeraX_main.py", line 712, in init
    run(sess, cmd)
  File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/core/commands/run.py", line 36, in run
    results = command.run(text, log=log, return_json=return_json)
  File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/core/commands/cli.py", line 2852, in run
    result = ci.function(session, **kw_args)
  File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/addh/cmd.py", line 63, in cmd_addh
    add_h_func(session, structures, template=template, in_isolation=in_isolation, **prot_schemes)
  File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/addh/cmd.py", line 170, in hbond_add_hydrogens
    add_hydrogens(session, atoms, type_info_for_atom, naming_schemas, hydrogen_totals,
  File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/addh/hbond.py", line 214, in add_hydrogens
    _attach_hydrogens(atom, altloc_hpos_info, bonding_info)
  File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/addh/hbond.py", line 895, in _attach_hydrogens
    add_altloc_hyds(atom, altloc_hpos_info, invert, bonding_info, total_hydrogens, naming_schema)
  File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/addh/cmd.py", line 862, in add_altloc_hyds
    h = new_hydrogen(atom, i+1, total_hydrogens, naming_schema,
  File "/usr/lib/ucsf-chimerax/lib/python3.8/site-packages/chimerax/addh/cmd.py", line 882, in new_hydrogen
    metal_pos = metal.get_alt_loc_coord(alt_loc)
  File "atomic_cpp/cymol.pyx", line 587, in chimerax.atomic.cymol.CyAtom.get_alt_loc_coord
ValueError: Atom /A MG 702 MG has no alt loc B



I'm using ucsf-chimerax_1.2.5-1_amd64.deb installed on Ubuntu 20.04. I've done some digging, and I cannot figure out what is going on. Any help would be appreciated.

Thanks in advance!
-James
--
James Loy, Ph. D.
614.915.9792
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