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Figure 3.
Fig. 3. Tube representation of the tertiary structures of
M3 (blue) and streptavidin (magenta) complexes with BNA (shown
in black). The L3,4 loop in both molecules is shown in gold. In
streptavidin, the loop is in the closed conformation, thus
burying the BNA ligand almost completely. In M3, where the loop
has three more residues, L3,4 adopts an open conformation. Note
the flipping of the amide bond of the ligand and the altered
conformation of the p-nitroanilide group.
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