FIGURE 3.

NMR structures of A3A‐TC DNA complexes. (a) The bundle of 20 structures of A3A^S‐DNA^S complex with the lowest energies. (b) The bundle of 20 structures of A3A^NS‐DNA^NS complex with the lowest energies. (c) One structure of A3A^S‐DNA^S complex. (d) One structure of A3A^NS‐DNA^NS complex. In (a, b) and (c, d), DNA (in orange) and A3A_4M (in cyan or pink) were displayed in ribbon and cartoon modes, respectively. The N‐ and C‐termini, the loops 1, 3, 5 and 7, the helices α1, α2, α3, α4, α5 and α6 of A3A_4M, and 5′‐ and 3′‐ ends of DNA were labeled, respectively. The grey balls represented zinc ions