Comparison of structures
of various Big domains (invasin, 1CWV; intimin, 1F00; BC Big_3, 2KPN; SP Big_3, 2L7Y), highlighting folding
patterns and secondary structures. A set of structures illustrates
the relationship between the position of the C and C′ loop
and the length of sheet 2. The Greek key structure of invasin, intimin,
and LigB-12 is colored yellow. Note the lack of the Greek key structure
due to the absence of D and E β-strands in Big_3 domains. The
length of the D–E loop is highly variable among Lig domains.
An alignment of sequences for the illustrated structures can be found
in the Supporting Information (Figure S3).