You can find the tool “Fixed Atoms” in the Refinement Toolbar (the side menu). 
Just click Fix Atom and then click the atom(s) you wish to fix. It won’t move 
in real space refinement or in regularisation.

> On 13 Mar 2018, at 19:46, Steve Chou <> wrote:
> Dear Coot developers and CCP4 list subscribers,
> The density of my map is not perfect. However, I know where a specific atom 
> should be located. Every time I did real space fitting, the atom and the 
> associated chemical groups in the whole ligand ran away. Is there a way to 
> fix the position of this atom, and let the force field drive the fitting of 
> the rest of the atoms in the ligand?
> Many thanks in advance!
> Steve
> -- 
> Steve Chou

Research Assistant Professor at UCIBIO@REQUIMTE-FCT-NOVA
Biologia Estrutural - Cristalografia de Raios-X (Gab 6.34)
Dep. Quimica, FCT-UNL
2829-516 Caparica
Phone: 00351212948300 (ext: Gab: 10940; Lab: 10962; X-ray Lab: 10915)
Fax: 00351212948550 <> <>

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