Figure 3 - full size

 

Figure 3.
FIGURE 3. The conserved disulfide bond and Ca^2+-binding region in the P domain. A, the Ca^2+-binding loop is stabilized by the conserved disulfide bond between Cys-270 and Cys-283. B, the 2F^o - F^c electron density is contoured at 1 at the region between Asp-282 and His-284. The Asp-282–Cys-283 peptide bond is in the normal trans configuration (arrow). C, the 2F^o - F^c electron density is contoured at 1.7 at the calcium-binding site. The Ca^2+ is shown as a yellow sphere.

The above figure is reprinted by permission from the ASBMB: J Biol Chem (2007, 282, 3889-3895) copyright 2007.