Proteins frequently bind metals such as Zn2+.

a. Compare the energy of interaction of a Zn2+ ion with the peptide group in Q2 through ion-dipole interactions and through ion-induced dipole at a distance of 1.5. Take the polarizability volume of the peptide to be 2.00 x10-30 m3. Which is stronger at this distance?

***in Q2. The dipole moment of an individual peptide group is approximately 3.46 D.

b. Would your answer change if the distance between the groups were doubled, and why or why not?