Dear Yu,

Since I don’t know what S2 and S3 richer state is… I don’t know if this is going to help. 
but, you can open, select and save pdb chains in chimera command line and view only the selected subunits:

Example:
1) View only the selected chain
~display
~ribbon
disp :.A-B

2) saving only selected PDB files 
open 6DHO 
select :.A-B
write selected 0 test.pdb 

then follow step 1.

if you don’t like cif file formats you can convert them in Phenix package (PDB tools).

Hope this helps,
David 

On Nov 24, 2018, at 11:28 AM, Yu Guo <yg2@kth.se> wrote:

Dear Sir/Madam,
         I am using Chimara to display large proteins. It is very nice. 6DHO(PDB structure, see attachment) is a very recent PSII structure consisting both S2 and S3(richer) states, which are highly overlapped in the raw data. I am urgently wondering how can I separate S3 out from the S2/S3 mixture by Chimera, especially the OEY​ cluster and all its ligands? Thank you very much!
Best wishes

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