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Ciao Luca, you can mask the Zn density using the function "Mask molecule by atom selection" available in the Extesions Menu. Roberto Quoting Luca Pellegrini <[log in to unmask]>: > Hi, > > We're trying to model a Zn-binding loop at 2.5A, and when we do Real Space > Refine Zone, Coot keeps pulling the Cys side chains into the density blob > of the zinc. Is there a way to set up a S-Zn distance restraint? > > thanks, > > Luca > -- Dr. Roberto Steiner Randall Division of Cell and Molecular Biophysics New Hunt's House King's College London Guy's Campus London, SE1 1UL Phone +44 (0)20-7848-8216 Fax +44 (0)20-7848-6435 e-mail [log in to unmask]