You will need to make sure that the group of the AME is "peptide" (or "L-peptide").  If you tell Coot that it's a non-polymer, it will believe you.

I guess this should be added to the FAQ.  Thanks.

Paul.

On 20/09/13 23:22, Ursula Schulze-Gahmen wrote:
Thanks Nigel,

All I need now is a cif file for acetyl-methionine.  How do I get to this? And should the cif file be for the free amino acid or for the residue in the peptide chain?

Ursula


On Fri, Sep 20, 2013 at 1:15 PM, Nigel Moriarty <[email protected]> wrote:
To have the refinement link the residues you should use the parameter intra_chain=True and check the bonds in the .geo file.

Paul Emsley will likely answer that Coot question.

Nigel


On Fri, Sep 20, 2013 at 12:06 PM, Ursula Schulze-Gahmen <[email protected]> wrote:
I am trying to include a N-terminal acetylated methionine in my model.
I replaced my methionine with a AME residue from the pdb data bank and
included a link command to connect the C from AME with the N of the
second residue. The AME is defined as HETATM. When I try to regularize
this structure in Coot it doesn't recognize that the 1. and 2. residue
should stay connected. What or how do I need to define this residue or
the connection so that I can model in Coot and refine in Phenix?

Ursula
--
Ursula Schulze-Gahmen, Ph.D.
Assistant Researcher
UC Berkeley, QB3
356 Stanley Hall #3220
Berkeley, CA 94720-3220
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Nigel W. Moriarty
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Lawrence Berkeley National Laboratory
Berkeley, CA 94720-8235
Phone : 510-486-5709     Email : [email protected]
Fax   : 510-486-5909       Web  : CCI.LBL.gov

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--
Ursula Schulze-Gahmen, Ph.D.
Assistant Researcher
UC Berkeley, QB3
356 Stanley Hall #3220
Berkeley, CA 94720-3220


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