[chimerax-users] Secondary structure display - pdb and cif

[Marta Perez Illana]

Hi Stephan

I am not an expert at all but I think I was having similar problems as 
you are mentioning...

In our case uploading the file to the pdb validation/deposition systems 
and getting back either of  the generated files was nicely fixing our 
problems... Maybe you have already tried this simple thing or maybe is 
worthy to give it a trial

  * (validation is quicker: upload summary "converted file name")
  * (deposition requires to fill in stuff with whole sequence: re-upload
    files "converted file name")

(Although the pdb_ extract tool was not useful for us right now as 
somehow some weird stuff in the loops was appearing...)

Regards

Marta

P.D. Also working here with huge molecules

On 04/03/2020 09:58, Tetter Stephan wrote:
>
> Dear  all,
>
>
> I am having an issue with secondary structure display. I am real-space 
> refining a set of 120 chains in phenix. Of these, only 10 are unique, 
> the rest is symmetry-related. Thus, I define secondary structure 
> elements for the 10 unique chains only. The output pdb file header 
> contains the secondary structure elements as imposed during 
> refinement. Displaying this pdb file in ChimeraX shows the right 
> secondary structure. The mmcif file instead, whether I use the phenix 
> output or generate it from the pdb myself, displays different, 
> non-sensical structures. Secondary structure is shown in loop regions, 
> and some actual strands and helices not recognized at all. This 
> artifact is only shown for the 10 subunits with secondary structure 
> definitions, the other subunits show no secondary structure at all, 
> thus something is read in, but not correctly, apparently. Any idea 
> what the problem could be? Could the size of the complex be an issue?
>
>
> The attachments show the lines from the two file types concerning 
> secondary structure definitions.
>
>
> Kind regards,
>
>
> Stephan
>
>
>
>
>
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