Figure 7From: The role of the Zn(II) binding domain in the mechanism of E. coli DNA topoisomerase IModel for removal of a negative supercoil by E. coli DNA topoisomerase I. Subdomains I, II, III, IV found in the crystal structure of Top67 (4) are illustrated schematically along with the potential site for ZD domain (Z). G-strand: DNA strand cleaved to provide "DNA Gate". T-strand: DNA strand to be transported through the "DNA Gate".Back to article page