FIGURE 5.

Chemical shift changes Δδ of (A) d3′EBS1 proton resonances upon binding of IBS1 and (B) upon addition of 3 mM Mg²⁺ for protons in the loop region of d3′EBS1 (left) and of d3′EBS1•IBS1 (right). Chemical shift changes for aromatic protons are given in the top panels and the ones of H1′ sugar protons in the bottom panels. Coloring of the boxes corresponds to that of the secondary structures in Figure 1, B and C.