Sandbox Reserved 1063: Difference between revisions
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=== Binding Site 1 === | === Binding Site 1 === | ||
<scene name='69/694230/Binding_site_1/1'>Binding site 1</scene> consists of a distorted tetrahedral geometry around Zn(II). The four amino acids involved in zinc binding are E24 Oe1, H42 Nd1, H108 Ne2, and H112 Ne2. Binding site 1 is the only binding site that plays a significant role in the protein's regulatory function. The ability of binding site 1 to coordinate to the Zn(II) ion is pH dependent. At pH 6 the binding affinity for the Zn(II) ion is 10^9 - 10^10 M^-1, but at pH 8 the binding affinity increases to 10^12 M^-1. This is due to the charges on the histidines of the binding site. At pH 8, the histidines are positively charged and can interact with the negatively charged Zn(II) ion | <scene name='69/694230/Binding_site_1/1'>Binding site 1</scene> consists of a distorted tetrahedral geometry around Zn(II). The four amino acids involved in zinc binding are E24 Oe1, H42 Nd1, H108 Ne2, and H112 Ne2. Binding site 1 is the only binding site that plays a significant role in the protein's regulatory function. The ability of binding site 1 to coordinate to the Zn(II) ion is pH dependent. At pH 6 the binding affinity for the Zn(II) ion is 10^9 - 10^10 M^-1, but at pH 8 the binding affinity increases to 10^12 M^-1. This is due to the charges on the histidines of the binding site. At pH 8, the histidines are positively charged and can interact with the negatively charged Zn(II) ion. However, at pH 6 the histidines are neutrally charged and will not coordinate as well with Zn(II). | ||
=== Binding Site 2 === | === Binding Site 2 === | ||
<scene name='69/694230/Binding_site_2/1'>Binding site 2</scene> consists of a highly distorted tetrahedral geometry around the zinc ion. There are three amino acids involved in the binding of the zinc ion (C30, E41, and E107) as well as a water molecule. If a C30A AdcR missense is present in binding site 2, it will have no effect on the ability of the protein to bind DNA. Therefore, binding site 2 has no significant role in DNA binding. | <scene name='69/694230/Binding_site_2/1'>Binding site 2</scene> consists of a highly distorted tetrahedral geometry around the zinc ion. There are three amino acids involved in the binding of the zinc ion (C30, E41, and E107) as well as a water molecule. If a C30A AdcR missense is present in binding site 2, it will have no effect on the ability of the protein to bind DNA. Therefore, binding site 2 has no significant role in DNA binding. | ||