[Chimera-users] Reassign chain ID letters

Elaine Meng meng at cgl.ucsf.edu
Mon Oct 21 13:16:47 PDT 2019

Hi Ahmad,
Sorry, there is no option to reassign chain IDs randomly.  There is a “changechains” command and a “Change Chain IDs” GUI where you have to specify the current chain ID and the new chain ID:


Actually, Chimera may not even understand number chain IDs, but I don’t have an example to try right now.  The documentation currently says that chain IDs are alphabetical characters.

Elaine C. Meng, Ph.D.
UCSF Chimera(X) team
Department of Pharmaceutical Chemistry
University of California, San Francisco

> On Oct 21, 2019, at 9:40 AM, Ahmad Khalifa <underoath006 at gmail.com> wrote:
> Hello,
> I have a structure with multiple chain IDs, some of them include number chain IDs and same letter small case and capital case chain IDs.
> I want to reassign the chain ID's randomly so that they are letters first then numbers, capital case then small case. How can I do that?! 
> Best regards. 

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