[chimerax-users] Replacing regular residues with unusual ones

[Eric Pettersen]

Hi Noor,
	No, swapaa cannot do that.  However, you could use the "Build Structure" tool (in the Structure Editing category) to modify a normal arginine into 2MR.  You would select the NH1 and change it to be trigonal with three bonds (which will add two hydrogens), then select a hydrogen and change it to be a tetrahedral carbon named CQ1 with 4 bonds (i.e. a methyl group).   Do a similar sequence with the NH2.  Before you make any changes, ensure that the "Residue Name" section of the tool is set to "Change modified residue's name to 2MR".

--Eric

	Eric Pettersen
	UCSF Computer Graphics Lab

> On Feb 9, 2021, at 5:29 PM, anaa2 <anaa2 at mrc-mbu.cam.ac.uk> wrote:
> 
> Hi,
> 
> In ChimeraX can a regular residue be replaced with an unusual one using the swapaa function(pdb code 2MR)?
> 
> Best wishes,
> Noor
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