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Hi, Bernhard and Yury: I did change Cys to CSX or CSO with older version of Coot. And the program replace the residue inner the chain. With present Coot-0.7, it seems to be complicated to replace a residue. Thank you for your suggestions. Uma On Wed, Sep 11, 2013 at 4:40 PM, Bernhard Lechtenberg < [log in to unmask]> wrote: > Hi Uma, > > when I do the same procedure (in OSX, but the problem seems to be the > same), the new residue is stored in a new chain with residue number 1. So > you would need to renumber the residue and change the chain ID back to the > original chain ID. It's annoyingly complicated, but it works for me. > > Hope that helps, > Bernhard > > > > On Sep 11, 2013, at 12:56 PM, Uma Ratu <[log in to unmask]> wrote: > > Hello, > > I try to replace one of cysteine residue to CSX using Win-coot. > > Here is how I did: > Extensions > Modelling > Replace Residue... and enter the three letter > code. > > The program place the CSX residue, but with break bond. The new residue is > no longer linked with other residue and not in the chain. > > I then try to replace with other residues, such as ALA. The results are > the same: the new residues all with break bond. > How could I put the replaced residue back to the main-chain? > > I use Win-coot-0.7. > > Thank you > > Uma > > > >