FIGURE 10.

(Top) Side groups of the K3 dimer. Only the labeled residues (Ala₁₀ and Ala₁₇ of one chain, and Ala₁₀ and Ala₁₄ of the other) as well as the lysine side chains are shown. The ¹³C and ¹⁹F labels are shown as black and green balls, respectively, and the amino nitrogens as blue balls. The approximate tilt angle of the two helices is 20°. (Bottom) Surface representation of the K3 dimer. The amino-terminus of the peptide and the terminal amino groups of the protruding lysine side chains are blue.