Figure 8. Intra- and Inter-chain Salt Bridge (Asp23-Lys28).

Structure A shows an intra-chain salt bridge between Asp23 and Lys28 in Zn(Aβ) at 200 ns. Structure B shows an inter-chain salt bridge between Asp23 and Lys28 in Zn(Aβ)₂ with Zn bridging at Glu11 and His13 at 200 ns. Gray spheres are Zn. Zn-binding residues (A: Glu11, His6, 13, 14; B:Glu11 and His13) are represented in licorice where red, blue and cyan represent oxygen, nitrogen and carbon respectively. Peptide backbones are shown in cartoon style where cyan indicates turn, white is coil, purple is alpha-helix, blue is 3₁₀ helix, and yellow is β-sheet.