We are working on a protein that is predicted to contain a zinc finger (ZnF). Could someone share your experience working with ZnF proteins? Should we add Zn during expression in E. coli? If so, which chemicals (ZnCl2, Zn(OAc)2, etc.) and how much? For purification, do we have to add Zn in the lysis buffer and how much? Is it okay to use Nickle column? What are other cautions we should be aware of? Thank you very much! _Gang