Hi Marco,
You could use the 'combine' command. You could select two models in
chimeraX and which will write a single pdb file.  Look at the below link.

https://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/combine.html

Best,
Rajiv


On Tue, 27 Feb, 2024, 7:54 pm Marco Bravo, <mbrav...@ucr.edu> wrote:

> Hello all,
> Does anyone know how to save a superimposed pymol or chimerax session as a
> PDB file in correct format so that I can used it for ccp4 refmac? I am
> trying to superimpose a protein with DNA bound onto the same protein from a
> different species without the DNA. I just want the DNA from the protein-DNA
> complex to be superimposed onto the apo protein structure. I have done the
> superimposition and got rid of the protein from the original protein-DNA
> complex and now have the DNA with the apo protein structure. When I try to
> use this new PDB filer for refmac or even MR I get this error.  Refmac:
> Input coordinate file is not complete. Does anyone know how to properly do
> this ?
>
> Thank you
>
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