[Chimera-users] Problem related to the "Near" atom in the "Adjust Torsions" tool of UCSF chimera

Prathvi Singh prathvi at iitk.ac.in
Sat Dec 25 05:34:17 PST 2021

Hi Elaine,

I have one more query. I have a residue (its ID is #0:140.a) in a protein
model. I want to change the torsion angle between its backbone N, backbone
C-alpha, sidechain C-beta & sidechain C-gamma. In order to do that, I
execute the following command:

rotation 1 :140.a at CA,140.a at CB

The execution activates the torsion & lists it in the "Adjust Torsions"
tool. However, I have noticed that the "near" atom in the "Adjust Torsions"
tool is sometimes assigned to backbone N & other times is assigned to
backbone C. This is messing up my calculations. Is there a way to fix the
"near" atom to backbone N so that it does not change to backbone C?

Thanks again

Prathvi Singh,
Research Fellow,
Department of Biological Sciences & Bioengineering,
Indian Institute of Technology, Kanpur-208016
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