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(A) Cartoon representation of the dimeric and monomeric βLg structures (PDB code 1BEB, chains A and B). The α-helices are colored red, the β-strands are green, and loops and turns are white. (B) Schematic representation of βLg topology (color code as in panel A). The I strand is involved in the dimer formation, whereas strands A–H fold into two β-sheets (strands AN-D and E-H-AC, where AN and AC respectively denote the N- and C-terminal portions of strand A, which suffers a 90° bend).
