To change the occupancy you can: 1) edit the pdb file in your text editor of choice; - or - 2) in coot, click "measures" > "residue info" > click on the metal > set occupancy to 0.5. Note that in phenix.refine, you may want to *fix* the occupancy to 0.5 (as it sounds like the metal ion is on/near a crystallographic axis). This can be done (via the GUI) in the refinement settings tab > modify selection for [occupancies], and then define the metal ion in the "Fix Occupancies" section. HTH, Dave On Fri, 8 Jul 2016 at 12:47 Sharan Karade wrote:

Dear all,

I am refining the protein structure and i want add metal ion in the structure, the site is present in between protein chain and its symmetry mate. when i added metal and refined, it was showing the high B factor and symmetry related metal on the same site. i want to assign the occupancy half and refine but in coot i am unable to do. Is there any method to do this.

Thanks in Advance

-- Sharan C/O Dr. J V Pratap Senior Research Fellow, CSIR-Central Drug Research Institute, Lucknow

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