Fig. 2. Conserved amino acid residues in the AtlA-gl, SagB, and AtlE substrate binding sites.

In the white ribbon structure, the catalytic glutamates (E116, E121, and E138) are shown as red sticks, the YA(S/T)D regions as blue sticks, and the conserved aromatic residues (Y191, F185, and Y201) as pink sticks. Note that S226 has a double conformation in the AtlE crystal.