Hydrogen bonding interactions between the two calcium binding loops of the N terminal domain of calmodulin. Hydrogen bonds are indicated by black dotted lines. Two crystallographic waters are shown as stars. The two calcium ions are shown as spheres. The molecular structure was rendered in Insight (MSI, San Diego) using PDB coordinates 1CLL.
This figure appeared as figure 6 in the book chapter:
Nelson, M.R., Chazin W.J., "Calmodulin as a calcium sensor" in
Calmodulin and Signal Transduction (1998) L.J. Van Eldik and
D.M. Watterson, eds. Academic Press, San Diego, pp. 17-64.
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