Figure 4. Intermolecular interactions between β−hairpin of Htt36Q3H and aromatic residues in MBP. (A) The interaction between the amide backbone of Q398 in Htt36Q3H and Y155 in MBP. (B) The interactions between the amide backbones of H399 and Q400 in Htt36Q3H and W230 in MBP. (C) The interactions between the amide backbone of Q401 in Htt36Q3H and Y210 in MBP. On panels (A), (B) and (C) the interactions at different angles are shown for C1 molecule in crystal X1. The Gln (orange) and His (pink) residues are labeled on the stick diagram The interacting residues are numbered and the interactions are shown with a dotted arrow line with interaction distances indicated in angstroms (Å). The interaction distances were measured from the backbone of the residues in the Htt36Q3H β-strand to the center of the aromatic ring residues in MBP. The supportive electron density maps (2Fo-Fc) at 1σ are shown by a green mesh for Htt38Q3H and a white mesh for MBP.