Another possibility is the monomer library. Coot defaults to using the monomer library installed by CCP4, and CCP4 switched monomer libraries between 6.1 and 6.2. At least with RNA, Coot relies on its own internal rules for drawing bonds between residues and only uses the monomer library for drawing lines within a residue, but its possible things are different with proteins. You could compare the old MSE monomer library to the new one and see if anything's changed. The relevant files are lib/data/monomers/m/MSE.cif file in the old and the new CCP4 installation directories. Maybe a mean bond length got shortened, although it seems like something as common as MSE shouldn't have had any overly dramatic changes.

    - Kevin

On 7/23/2011 11:20 AM, Pedro M. Matias wrote:
Hi,

In your PDB file, are the coordinates of the MET residues ATOM or HETATM lines ? I suspect HETATM cards in a protein PDB file might have that effect in COOT.

Cheers,

Pedro.

At 20:43 22-07-2011, Shuilong Tong wrote:
Hi all,

I got broken bonds between MSE and neighboring residues in Coot 0.6.2 under CCP4 6.2.0. Coot worked well under CCP4 6.1.13, when I updated ccp4 6.1.13 to 6.2.0, the problem raised.

OS info: 64bit OpenSuSE11.3

Could anybody help me ?

Thank you!

shuilong

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