Add charge: Could not come up with unique atom name in mega-residue

[chimerax-bug-report@…]

The following bug report has been submitted:
Platform:        Windows-10-10.0.19043
ChimeraX Version: 1.3 (2021-12-08 23:08:33 UTC)
Description
(Describe the actions that caused this problem to occur here)

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 6Z3W

Summary of feedback from opening 6Z3W fetched from pdb  
---  
note | Fetching compressed mmCIF 6z3w from
http://files.rcsb.org/download/6z3w.cif  
  
6z3w title:  
Human ER membrane protein complex [more info...]  
  
Chain information for 6z3w #1  
---  
Chain | Description | UniProt  
A | ER membrane protein complex subunit 1,ER membrane protein complex subunit
1,ER membrane protein complex subunit 1,ER membrane protein complex subunit 1
| EMC1_HUMAN  
B | ER membrane protein complex subunit 2 | EMC2_HUMAN  
C | ER membrane protein complex subunit 3 | EMC3_HUMAN  
D | ER membrane protein complex subunit 4 | EMC4_HUMAN  
E | Membrane magnesium transporter 1 | MMGT1_HUMAN  
F | ER membrane protein complex subunit 6 | EMC6_HUMAN  
G | ER membrane protein complex subunit 7 | EMC7_HUMAN  
H | ER membrane protein complex subunit 9 | EMC9_HUMAN  
I | ER membrane protein complex subunit 10 | EMC10_HUMAN  
  

> coulombic

Using Amber 20 recommended default charges and atom types for standard
residues  
Traceback (most recent call last):  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\toolbar\tool.py", line 205, in callback  
bundle_info.run_provider(session, name, session.toolbar,
display_name=display_name)  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\core\toolshed\info.py", line 381, in run_provider  
return api._api_caller.run_provider(api, session, name, mgr, **kw)  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\core\toolshed\\__init__.py", line 1284, in run_provider  
return cls._get_func(api, "run_provider")(session, name, mgr, **kw)  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\shortcuts\\__init__.py", line 52, in run_provider  
shortcuts.run_provider(session, name)  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\shortcuts\shortcuts.py", line 1334, in run_provider  
keyboard_shortcuts(session).try_shortcut(name)  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\shortcuts\shortcuts.py", line 390, in try_shortcut  
self.run_shortcut(keys)  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\shortcuts\shortcuts.py", line 408, in run_shortcut  
sc.run(self.session, status = self._enabled)  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\shortcuts\shortcuts.py", line 327, in run  
f(s)  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\shortcuts\shortcuts.py", line 61, in func_plus_tip  
func(cmd + " %s")(session)  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\shortcuts\shortcuts.py", line 569, in run_expanded_command  
run(session, cmd)  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\shortcuts\shortcuts.py", line 512, in run  
run_command(session, command, **kw)  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\core\commands\run.py", line 36, in run  
results = command.run(text, log=log, return_json=return_json)  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\core\commands\cli.py", line 2856, in run  
result = ci.function(session, **kw_args)  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\coulombic\cmd.py", line 90, in cmd_coulombic  
assign_charges(session, needs_assignment, his_scheme, charge_method,  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\coulombic\coulombic.py", line 99, in assign_charges  
add_charges(session, charged_residues, method=charge_method, status=status,  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\add_charge\charge.py", line 23, in add_charges  
uncharged_res_types = add_standard_charges(session, residues, status=status,
query_user=query_user,  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\add_charge\charge.py", line 186, in add_standard_charges  
fr = FakeRes(connected)  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\add_charge\charge.py", line 775, in __init__  
raise ValueError("Could not come up with unique atom name in mega-residue")  
ValueError: Could not come up with unique atom name in mega-residue  
  
ValueError: Could not come up with unique atom name in mega-residue  
  
File "C:\Program Files\ChimeraX 1.3\bin\lib\site-
packages\chimerax\add_charge\charge.py", line 775, in __init__  
raise ValueError("Could not come up with unique atom name in mega-residue")  
  
See log for complete Python traceback.  
  




OpenGL version: 3.3.0 NVIDIA 512.13
OpenGL renderer: NVIDIA GeForce RTX 3070/PCIe/SSE2
OpenGL vendor: NVIDIA Corporation
Manufacturer: Dell Inc.
Model: XPS 8940
OS: Microsoft Windows 10 Pro (Build 19043)
Memory: 33,941,618,688
MaxProcessMemory: 137,438,953,344
CPU: 16 11th Gen Intel(R) Core(TM) i7-11700 @ 2.50GHz
OSLanguage: en-US
Locale: ('en_US', 'cp1252')
PyQt5 5.15.2, Qt 5.15.2
Installed Packages:
    alabaster: 0.7.12
    appdirs: 1.4.4
    Babel: 2.9.1
    backcall: 0.2.0
    blockdiag: 2.0.1
    certifi: 2021.10.8
    cftime: 1.5.1.1
    charset-normalizer: 2.0.9
    ChimeraX-AddCharge: 1.2.2
    ChimeraX-AddH: 2.1.11
    ChimeraX-AlignmentAlgorithms: 2.0
    ChimeraX-AlignmentHdrs: 3.2
    ChimeraX-AlignmentMatrices: 2.0
    ChimeraX-Alignments: 2.2.3
    ChimeraX-AlphaFold: 1.0
    ChimeraX-AltlocExplorer: 1.0.1
    ChimeraX-AmberInfo: 1.0
    ChimeraX-Arrays: 1.0
    ChimeraX-Atomic: 1.31
    ChimeraX-AtomicLibrary: 4.2
    ChimeraX-AtomSearch: 2.0
    ChimeraX-AtomSearchLibrary: 1.0
    ChimeraX-AxesPlanes: 2.0
    ChimeraX-BasicActions: 1.1
    ChimeraX-BILD: 1.0
    ChimeraX-BlastProtein: 2.0
    ChimeraX-BondRot: 2.0
    ChimeraX-BugReporter: 1.0
    ChimeraX-BuildStructure: 2.6.1
    ChimeraX-Bumps: 1.0
    ChimeraX-BundleBuilder: 1.1
    ChimeraX-ButtonPanel: 1.0
    ChimeraX-CageBuilder: 1.0
    ChimeraX-CellPack: 1.0
    ChimeraX-Centroids: 1.2
    ChimeraX-ChemGroup: 2.0
    ChimeraX-Clashes: 2.2.2
    ChimeraX-ColorActions: 1.0
    ChimeraX-ColorGlobe: 1.0
    ChimeraX-ColorKey: 1.5
    ChimeraX-CommandLine: 1.1.5
    ChimeraX-ConnectStructure: 2.0
    ChimeraX-Contacts: 1.0
    ChimeraX-Core: 1.3
    ChimeraX-CoreFormats: 1.1
    ChimeraX-coulombic: 1.3.2
    ChimeraX-Crosslinks: 1.0
    ChimeraX-Crystal: 1.0
    ChimeraX-CrystalContacts: 1.0
    ChimeraX-DataFormats: 1.2.2
    ChimeraX-Dicom: 1.0
    ChimeraX-DistMonitor: 1.1.5
    ChimeraX-DistUI: 1.0
    ChimeraX-Dssp: 2.0
    ChimeraX-EMDB-SFF: 1.0
    ChimeraX-ExperimentalCommands: 1.0
    ChimeraX-FileHistory: 1.0
    ChimeraX-FunctionKey: 1.0
    ChimeraX-Geometry: 1.1
    ChimeraX-gltf: 1.0
    ChimeraX-Graphics: 1.1
    ChimeraX-Hbonds: 2.1.2
    ChimeraX-Help: 1.2
    ChimeraX-HKCage: 1.3
    ChimeraX-IHM: 1.1
    ChimeraX-ImageFormats: 1.2
    ChimeraX-IMOD: 1.0
    ChimeraX-IO: 1.0.1
    ChimeraX-ItemsInspection: 1.0
    ChimeraX-Label: 1.1
    ChimeraX-ListInfo: 1.1.1
    ChimeraX-Log: 1.1.4
    ChimeraX-LookingGlass: 1.1
    ChimeraX-Maestro: 1.8.1
    ChimeraX-Map: 1.1
    ChimeraX-MapData: 2.0
    ChimeraX-MapEraser: 1.0
    ChimeraX-MapFilter: 2.0
    ChimeraX-MapFit: 2.0
    ChimeraX-MapSeries: 2.1
    ChimeraX-Markers: 1.0
    ChimeraX-Mask: 1.0
    ChimeraX-MatchMaker: 2.0.4
    ChimeraX-MDcrds: 2.6
    ChimeraX-MedicalToolbar: 1.0.1
    ChimeraX-Meeting: 1.0
    ChimeraX-MLP: 1.1
    ChimeraX-mmCIF: 2.4
    ChimeraX-MMTF: 2.1
    ChimeraX-Modeller: 1.2.6
    ChimeraX-ModelPanel: 1.2.1
    ChimeraX-ModelSeries: 1.0
    ChimeraX-Mol2: 2.0
    ChimeraX-Morph: 1.0
    ChimeraX-MouseModes: 1.1
    ChimeraX-Movie: 1.0
    ChimeraX-Neuron: 1.0
    ChimeraX-Nucleotides: 2.0.2
    ChimeraX-OpenCommand: 1.7
    ChimeraX-PDB: 2.6.5
    ChimeraX-PDBBio: 1.0
    ChimeraX-PDBLibrary: 1.0.2
    ChimeraX-PDBMatrices: 1.0
    ChimeraX-PickBlobs: 1.0
    ChimeraX-Positions: 1.0
    ChimeraX-PresetMgr: 1.0.1
    ChimeraX-PubChem: 2.1
    ChimeraX-ReadPbonds: 1.0.1
    ChimeraX-Registration: 1.1
    ChimeraX-RemoteControl: 1.0
    ChimeraX-ResidueFit: 1.0
    ChimeraX-RestServer: 1.1
    ChimeraX-RNALayout: 1.0
    ChimeraX-RotamerLibMgr: 2.0.1
    ChimeraX-RotamerLibsDunbrack: 2.0
    ChimeraX-RotamerLibsDynameomics: 2.0
    ChimeraX-RotamerLibsRichardson: 2.0
    ChimeraX-SaveCommand: 1.5
    ChimeraX-SchemeMgr: 1.0
    ChimeraX-SDF: 2.0
    ChimeraX-Segger: 1.0
    ChimeraX-Segment: 1.0
    ChimeraX-SelInspector: 1.0
    ChimeraX-SeqView: 2.4.6
    ChimeraX-Shape: 1.0.1
    ChimeraX-Shell: 1.0
    ChimeraX-Shortcuts: 1.1
    ChimeraX-ShowAttr: 1.0
    ChimeraX-ShowSequences: 1.0
    ChimeraX-SideView: 1.0
    ChimeraX-Smiles: 2.1
    ChimeraX-SmoothLines: 1.0
    ChimeraX-SpaceNavigator: 1.0
    ChimeraX-StdCommands: 1.6.1
    ChimeraX-STL: 1.0
    ChimeraX-Storm: 1.0
    ChimeraX-Struts: 1.0
    ChimeraX-Surface: 1.0
    ChimeraX-SwapAA: 2.0
    ChimeraX-SwapRes: 2.1
    ChimeraX-TapeMeasure: 1.0
    ChimeraX-Test: 1.0
    ChimeraX-Toolbar: 1.1
    ChimeraX-ToolshedUtils: 1.2
    ChimeraX-Tug: 1.0
    ChimeraX-UI: 1.13.7
    ChimeraX-uniprot: 2.2
    ChimeraX-UnitCell: 1.0
    ChimeraX-ViewDockX: 1.0.1
    ChimeraX-VIPERdb: 1.0
    ChimeraX-Vive: 1.1
    ChimeraX-VolumeMenu: 1.0
    ChimeraX-VTK: 1.0
    ChimeraX-WavefrontOBJ: 1.0
    ChimeraX-WebCam: 1.0
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[Eric Pettersen]

Already fixed by treating UNK as ALA. This structure is hopeless anyway since there are no side chains.