FIGURE 6.
Binding of the δ-subunit to the N terminus of the α-subunit. Shown is the binding of a 22-residue peptide corresponding to the N-terminal region of the α-subunit to the δ-subunit as deduced by NMR (65). The helical peptide (gray) nestles between two helices (blue and orange) on δ. The naturally occurring δ-Trp-28 provided an excellent optical probe.