Problem swapping pseudo symmetric side chains

[nxb318@…]

The following bug report has been submitted:
Platform:        Linux-5.4.0-89-generic-x86_64-with-glibc2.31
ChimeraX Version: 1.3 (2021-12-08 23:08:33 UTC)
Description
Externally generated a small, branched glycan (NAG-NAG-Man-Man--Man) and added it to the PDB file of my protein (contains all the Amino acid residues, no chain breaks). Then I have saved the glycan +protein as a single mol2 file, opened it in Chimera and added a N-glycosidic bond that was missing between Asp and glycan. Saved as a signle PDB, opened in Chimerax 1.3 together with my cryoEM map to try and minimize the structure. Isolde runs into this error. Ill delete the plugin and reinstall it again. Kindly let me know if glycan simulation is supported.

Thank You very much

Log:
UCSF ChimeraX version: 1.3 (2021-12-08)  
© 2016-2021 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open /mnt/data0/Data_processing/FROM_EXX/cls1_relion/G2-3m-dom-cls1_glyc.pdb

Chain information for G2-3m-dom-cls1_glyc.pdb #1  
---  
Chain | Description  
A B C D | No description available  
  

> open /mnt/data0/Data_processing/FROM_EXX/cls1_relion/run_class001-zflip.mrc

Opened run_class001-zflip.mrc as #2, grid size 420,420,420, pixel 1.06, shown
at level 0.00802, step 2, values float32  

> volume #2 step 1

> volume #2 level 0.01434

> volume #2 level 0.01229

> ui tool show ISOLDE

> set selectionWidth 4

ISOLDE: Checking and correcting nomenclature for (pseudo)symmetric side
chains...  
Traceback (most recent call last):  
File "/usr/lib/ucsf-chimerax/lib/python3.9/site-
packages/chimerax/core/toolshed/info.py", line 554, in start_tool  
ti = api._api_caller.start_tool(api, session, self, tool_info)  
File "/usr/lib/ucsf-chimerax/lib/python3.9/site-
packages/chimerax/core/toolshed/__init__.py", line 1264, in start_tool  
return cls._get_func(api, "start_tool")(session, ti.name)  
File "/home/user/.local/share/ChimeraX/1.3/site-
packages/chimerax/isolde/__init__.py", line 155, in start_tool  
return tools.get_singleton(session, ISOLDE_ToolUI, 'ISOLDE', create=True)  
File "/usr/lib/ucsf-chimerax/lib/python3.9/site-
packages/chimerax/core/tools.py", line 193, in get_singleton  
tinst = tool_class(session, tool_name, **kw)  
File "/home/user/.local/share/ChimeraX/1.3/site-
packages/chimerax/isolde/tool.py", line 186, in __init__  
self.isolde = isolde.Isolde(self)  
File "/home/user/.local/share/ChimeraX/1.3/site-
packages/chimerax/isolde/isolde.py", line 317, in __init__  
self._start_gui(gui)  
File "/home/user/.local/share/ChimeraX/1.3/site-
packages/chimerax/isolde/isolde.py", line 482, in _start_gui  
self._update_model_list(None, None, force=True)  
File "/home/user/.local/share/ChimeraX/1.3/site-
packages/chimerax/isolde/isolde.py", line 1050, in _update_model_list  
self._change_selected_model(model=current_model)  
File "/home/user/.local/share/ChimeraX/1.3/site-
packages/chimerax/isolde/isolde.py", line 2525, in _change_selected_model  
correct_pseudosymmetric_sidechain_atoms(session, m.residues)  
File "/home/user/.local/share/ChimeraX/1.3/site-
packages/chimerax/isolde/atomic/util.py", line 28, in
correct_pseudosymmetric_sidechain_atoms  
if flip_if_necessary(r, ('CD','NE','CZ',('NH2','NH1'))):  
File "/home/user/.local/share/ChimeraX/1.3/site-
packages/chimerax/isolde/atomic/util.py", line 66, in flip_if_necessary  
if swap_equivalent_atoms(residue):  
File "/home/user/.local/share/ChimeraX/1.3/site-
packages/chimerax/isolde/atomic/util.py", line 118, in swap_equivalent_atoms  
pair[0].coords, pair[1].coords = pair[1].coords, pair[0].coords  
File "/usr/lib/ucsf-chimerax/lib/python3.9/site-
packages/chimerax/atomic/molc.py", line 210, in set_prop  
raise ValueError('Values array length %d does not match objects array length
%d'  
ValueError: Values array length 2 does not match objects array length 1  
  
During handling of the above exception, another exception occurred:  
  
Traceback (most recent call last):  
File "/usr/lib/ucsf-chimerax/lib/python3.9/site-packages/chimerax/ui/gui.py",
line 1659, in <lambda>  
run(ses, "ui tool show %s" % StringArg.unparse(tool_name)))  
File "/usr/lib/ucsf-chimerax/lib/python3.9/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/python3.9/site-
packages/chimerax/core/commands/cli.py", line 2856, in run  
result = ci.function(session, **kw_args)  
File "/usr/lib/ucsf-chimerax/lib/python3.9/site-packages/chimerax/ui/cmd.py",
line 219, in ui_tool_show  
bi.start_tool(session, name)  
File "/usr/lib/ucsf-chimerax/lib/python3.9/site-
packages/chimerax/core/toolshed/info.py", line 559, in start_tool  
raise ToolshedError(  
chimerax.core.toolshed.ToolshedError: start_tool() failed for tool ISOLDE in
bundle ChimeraX-ISOLDE:  
Values array length 2 does not match objects array length 1  
  
chimerax.core.toolshed.ToolshedError: start_tool() failed for tool ISOLDE in
bundle ChimeraX-ISOLDE:  
Values array length 2 does not match objects array length 1  
  
File "/usr/lib/ucsf-chimerax/lib/python3.9/site-
packages/chimerax/core/toolshed/info.py", line 559, in start_tool  
raise ToolshedError(  
  
See log for complete Python traceback.  
  




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OpenGL renderer: NVIDIA T600/PCIe/SSE2
OpenGL vendor: NVIDIA Corporation
Manufacturer: System manufacturer
Model: System Product Name
OS: Linux Mint 20.2 uma
Architecture: 64bit ELF
Virutal Machine: none
CPU: 20 Intel(R) Core(TM) i9-10900X CPU @ 3.70GHz
Cache Size: 19712 KB
Memory:
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	Mem:           31Gi        14Gi       2.2Gi       420Mi        14Gi        15Gi
	Swap:         8.0Gi        25Mi       8.0Gi

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	65:00.0 VGA compatible controller [0300]: NVIDIA Corporation TU117GL [T600] [10de:1fb1] (rev a1)	
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[Eric Pettersen]

Reported by Nebojsa Bogdanovic

[Tristan Croll]

Hmm... I'm honestly struggling to see how this failure mode could happen. Would you mind sharing a copy of the coordinates so I can diagnose properly?