#15654 closed defect (fixed)

Residue 1-letter code reported as X while PDB reports it as K

Reported by: goddard@… Owned by: Greg Couch
Priority: normal Milestone:
Component: Input/Output Version:
Keywords: Cc: Eric Pettersen
Blocked By: Blocking:
Notify when closed: Platform: all
Project: ChimeraX

Description

The following bug report has been submitted:
Platform:        macOS-14.5-arm64-arm-64bit
ChimeraX Version: 1.9.dev202407140612 (2024-07-14 06:12:12 UTC)
Description
ChimeraX sequence viewer reports the 1-letter code for residue 39 of PDB 6uyy as X while the PDB reports it as K.  The 3-letter code is ALY and it is a modified residue with base type lysine (K).  It appears we are not getting that information when reading the mmCIF file.

Log:
UCSF ChimeraX version: 1.9.dev202407140612 (2024-07-14)  
© 2016-2024 Regents of the University of California. All rights reserved.  
How to cite UCSF ChimeraX  

> open 6uyy

6uyy title:  
Crystal structure of K39-acetylated SUMO1 in complex with phosphorylated DAXX
[more info...]  
  
Chain information for 6uyy #1  
---  
Chain | Description | UniProt  
A | Small ubiquitin-related modifier 1 | SUMO1_HUMAN 17-97  
B | phosphorylated DAXX |   
  
Non-standard residues in 6uyy #1  
---  
ALY — N(6)-acetyllysine  
  
18 atoms have alternate locations. Control/examine alternate locations with
Altloc Explorer [start tool...] or the altlocs command.  

> ui tool show "Show Sequence Viewer"

> sequence chain /A

Alignment identifier is 1/A  

> select /A:39

26 atoms, 25 bonds, 1 residue, 1 model selected  

> select /A:39

26 atoms, 25 bonds, 1 residue, 1 model selected  




OpenGL version: 4.1 Metal - 88.1
OpenGL renderer: Apple M2 Ultra
OpenGL vendor: Apple

Python: 3.11.4
Locale: UTF-8
Qt version: PyQt6 6.6.1, Qt 6.6.1
Qt runtime version: 6.6.3
Qt platform: cocoa
Hardware:

    Hardware Overview:

      Model Name: Mac Studio
      Model Identifier: Mac14,14
      Model Number: Z1800003VLL/A
      Chip: Apple M2 Ultra
      Total Number of Cores: 24 (16 performance and 8 efficiency)
      Memory: 64 GB
      System Firmware Version: 10151.121.1
      OS Loader Version: 10151.121.1

Software:

    System Software Overview:

      System Version: macOS 14.5 (23F79)
      Kernel Version: Darwin 23.5.0
      Time since boot: 34 days, 23 hours, 24 minutes

Graphics/Displays:

    Apple M2 Ultra:

      Chipset Model: Apple M2 Ultra
      Type: GPU
      Bus: Built-In
      Total Number of Cores: 60
      Vendor: Apple (0x106b)
      Metal Support: Metal 3
      Displays:
        PHL 278B1:
          Resolution: 3840 x 2160 (2160p/4K UHD 1 - Ultra High Definition)
          UI Looks like: 1920 x 1080 @ 60.00Hz
          Main Display: Yes
          Mirror: Off
          Online: Yes
          Rotation: Supported


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Change History (6)

comment:1 by Tom Goddard, 15 months ago

Cc: Eric Pettersen added
Component: UnassignedInput/Output
Owner: set to Greg Couch
Platform: all
Project: ChimeraX
Status: newassigned
Summary: ChimeraX bug report submissionResidue 1-letter code reported as X while PDB reports it as K

This bug only effects the mmCIF file reader. If the PDB format file is read then it correctly identifies residue 39 as having 1-letter code K instead of X.

comment:2 by Greg Couch, 15 months ago

The bug comes from the fact that the 6uyy.cif file includes the residue template information (chem_comp, chem_comp_bond, chem_comp_atom). So the mmCIF reader is using the contents of those tables instead of downloading the residue template. And chem_comp.one_letter_code is missing from the mmCIF file.

There is other missing information in the template that we want, so I'll flip the code to only use the file's information when it can't get a template.

comment:3 by Greg Couch, 15 months ago

It appears to be a bit more complicated. Using the fetched residue template does make it so Sequence::protein3to1("ALY") returns 'K' instead of 'X'. But it still showing up as 'X' in the sequence.

comment:4 by Eric Pettersen, 15 months ago

I don't know what the execution flow of your code is, but you need to call Sequence::assign_rname3to1 before you call structure.set_input_seq_info, if you aren't already.

comment:5 by Greg Couch, 15 months ago

Yup, that's the bug. I have to untangle some logic to fix it.

comment:6 by Greg Couch, 15 months ago

Resolution: fixed
Status: assignedclosed

Add prefetching of all residue templates so one-letter code is known ahead of time.

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