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Putting in a heteroatom

I have modeled a large protein (1058 residues) based on the Xray structure of a homologous protein. The homologous protein (1EUL) has two Calcium ions, while the homologue I have modeled should have one Calcium ion, in the position corresponding to one of the Calciums in 1EUL. I can't figure out how to introduce this Calcium ion into my model. Can anyone advise me?


John T. Penniston, Ph.D.
Dept. of Biochemistry and Molecular Biology
Guggenheim 16, Mayo Clinic
200 First St. SW
Rochester, MN 55905 USA