Dear Cristina,

In CCP4 you've got two options that use the modern approach (Acedrg):

(1) CCP4i2 -> Ligands -> Make Covalent Link.

(2) Coot -> Calculate -> Modules -> CCP4. This will make a "CCP4" menu appear 
that contains the option: Make Link via Acedrg.

Hopefully it's pretty self-explanatory from there - you'll end up with a CIF 
dictionary containing the link description, which you can then pass to your 
refinement program. Both of these options require the latest version of CCP4 
(7.1).

Regards,
Rob


> On 2 Jul 2020, at 15:59, Cristina Machon <cms...@ibmb.csic.es> wrote:
> 
> Dear all,
> 
> I am writing regarding a problem we are facing with the refinement of a 
> structure. We would really appreciate it if anybody could suggest how to set 
> up geometrical restraints for a protein-DNA covalent bond in Refmac or 
> Phenix? 
> 
> Thanks in advance,
> 
> Best wishes,
> 
> Cristina
> 
> 
> -- 
> Cristina Machón Sobrado, PhD
> Instituto de Biología Molecular Barcelona-CSIC
> Parc Científic de Barcelona
> c/ Baldiri Reixac 10
> 08028 Barcelona
> Spain
> 
> Phone: +34934034957
> 
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