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(A) Ribbon representation of the AtuE trimer. Each subunit is shown in a different color. The proposed catalytic residue Glu139 is shown in each subunit in sphere representation. (B) Chain A of the trimer. The N- and C-terminal domains are shown in yellow and blue, respectively. Secondary structure elements are labeled. Glu139 is depicted as a stick. The figure was created with the Chimera (version 1.10) program (34).
