Tile plots showing NOE cross-peaks between nonexchangeable protons of DNA and IQ protons in the NarIIQ1 and NarIIQ2 duplexes. (A) NOE cross-peaks for the NarIIQ1 duplex: (a) C20 H2′ → IQ H9A, (b) C20 H2″ → IQ H9A, (c) G22 H5′ → IQ H9A, (d) C20 H3′ → IQ H9A, (e) C21 H4′ → IQ H9A, (f) C21 H1′ → IQ H9A, (g) C20 H1′ → IQ H9A, (h) C20 H8 → IQ H9A, (i) G17 H8 → IQ H9A, (j) G22 H1′ → IQ H4A, (k) G22 H1′ → IQ H5A, (l) X4 H1′ → IQ CH3, (m) G5 H1′ → IQ CH , (n) G5 H5′ → IQ CH3, (o) G22 N1H → IQ CH3, and (p) G5 N1H → IQ CH3. (B) NOE cross-peaks for the NarIIQ2 duplex: (a) G19 H2″ → IQ H9A, (b) G19 H3′ → IQ H9A, (c) G19 H1′ → IQ H9A, (d) C20 H1′ → IQ H9A, (e) C21 H6 → IQ H9A, (f) G19 H8 → IQ H9A, (g) C21 H1′ → IQ H4A, (h) C20 H2′ → IQ H5A, (i) C20 H2″ → IQ H5A, (j) G19 H2″ → IQ H8A, (k) C21 H4′ → IQ H5A, (l) C21 H5 → IQ H5A, (m) C21 H1′ → IQ H5A, (n) G19 H8 → IQ H8A, (o) X5 H1′ → IQ CH3, (p) C6 H1′ → IQ CH3, (q) C21 H1′ → IQ CH3, (r) C6 H4′ → IQ CH3, (s) G4 N1H → IQ CH3, and (t) G19 N1H → IQ CH3.