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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?
Thanks,
John

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