Three orthogonal view of TnBgl3B (PDB code 2X40) (A), KmBgI1 (PDB code 3ABZ) (B), AaBgI1 (PDB code 4IIB) (C), and superposition of ab initio dummy atom model (gray surface) (D); rigid body model (domains and hinge, respectively, schematic, and dummy atoms). Color patterns are as follows: N-terminal domain (blue); β-sandwich domain (green); PA14 domain (yellow); FnIII-like fold domain (red); first linker (cyan), and second linker (orange); rigid body model hinge 2. The models are rotated from upper models in relation to axis x and y by 90°.