Dear Guenter,

Yes, it is similar to adding bond/angle restraints described here:

https://phenix-online.org/documentation/reference/refinement.html#definition-of-custom-bonds-and-angles

The only difference is you would use planarity restraints scope as below (from the bottom of the doc page):

planarity
- action = *add delete change
- atom_selection = None
- sigma = None

You will have to combine all atoms you want to a single selection, like "Chain X and resid Z and (name A or name B or name C or name D)", where Z is residue id (a number).

Best regards,

Oleg Sobolev.

On Fri, May 27, 2022 at 4:48 AM Guenter Fritz <guenter.fritz.phenix.ccp4@gmail.com> wrote:

Dear all,

is it possible to define custom planar restraints, let's say atoms
A,B,C,D from residue Z should stay in a plane.

Best regards,

Guenter

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