[Chimera-users] calculating radius of gyration

[Simon.Chapman]

Thank you for the prompt reply Elaine. I hadn't spotted this link even though I had rummaged through Chimera help.

The scripts look very useful. But I'm not sure where they woud be run..these don't look like Chimera command line instructions?  The first line seems very unfamiliar...perhaps "Pett" might elucidate? Or one of your colleagues if you are also uncertain about their use?

Best wishes

Simon




________________________________
From: Elaine Meng <meng at cgl.ucsf.edu>
Sent: 14 December 2021 20:29
To: Simon.Chapman <simon.chapman at open.ac.uk>
Cc: Chimera <chimera-users at cgl.ucsf.edu>
Subject: calculating radius of gyration

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> On Dec 14, 2021, at 11:10 AM, Simon.Chapman <simon.chapman at open.ac.uk> wrote:
>
> Hello again Elaine. All going very well with Chimera, and I've introduced the software to some more of mt students.
>
> But, is there a way to plot radius of gyration from the simualtion data? I would have thought somehow the RMSD over time should allow that?
>
> Best wishes

Hi Simon,
Thanks for introducing others to Chimera!

I'm not the expert on this topic, so I had to consult with others to answer this question.  Just as a reminder, it's recommended to send questions to chimera-users at cgl.ucsf.edu (CC'd here) unless what you are sending needs to remain private.  I don't know everything (surprise!) or I might not understand your question as well as somebody else does.

RMSD compares different sets of coordinates, so I don't think that gets you anything like the radius of gyration of a single set of coordinates.

There are some scripts to calculate radius of gyration on the Chimera Python Scripts page:
<https://plato.cgl.ucsf.edu/trac/chimera/wiki/Scripts>

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


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