Sandbox Reserved 1069: Difference between revisions

<scene name='69/694236/Site_c/1'>Binding Site C</scene> has vastly opposite properties from what is seen in binding site A. It is located on the TM2-TM3 loop on the cytoplasmic membrane and between the two C-terminus domain interfaces. Here, there is a binuclear coordination of Zn²⁺ between the <scene name='69/694236/Asp285/3'>Asp285</scene> residue that bridges the Zn²⁺ ions together and the four coordinating residues (<scene name='69/694236/His232/2'>His232</scene>, <scene name='69/694236/His248/1'>His248</scene>, <scene name='69/694236/His283/1'>His283</scene> and <scene name='69/694236/His261/1'>His261</scene>). The Asp285 residue is conserved, meaning it does not have outer shell constraints. However, the four histidine residues all have outer shell constraints. These constraints consist of hydrogen bonds to the residues surrounding the binding site. These hydrogen bonds can form bidentate bonds, which means that the hydrogen bond attaches to a metal in two places. These bonds in turn create an extensive network of interactions at the CTD interface, and it is these interactions that allow for stability and strengthening of the CTD-CTD association.