The 5-amino-acid fragment in the β-barrel core of the C-terminal domain. Closeup view of the interactions of the 5-amino-acid fragment with the neighboring residues in the β-barrel structure. Only three residues (Thr241, Lys242, and Val243) are shown. The last two C-terminal residues (Gly244 and Asn245) are invisible due to the poor electron density map. The residues belonging to the 5-amino-acid fragment (magenta), the interacting residues from β13 (gray), and the interacting residues from β10 (blue) are shown in the stick models. The dashed lines and red ovals indicate the hydrogen bonds and water molecules, respectively.