There is a button for doing this - add OXT, which if I recall is hidden in the "other modelling tools" menu.
Tony. Sent from my iPhone On 17 Feb 2012, at 10:26, "Hubing Lou" <[email protected]> wrote: > Dear all, > > I have a structure solved by molecular replacement. The C-terminus at > the end of the chain shows as CO, not COOH. How do I make it into COOH > in COOT? I tried to place an O in the relevant position, but seems not > working this way. > > Thanks, > > Hubing
