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The ARTT loop deformations. (A) The ARTT loop from the C3-Q212A-free structure (form II, mol X) is superimposed on those of the C3-Q212A-free and C3-Q212A-NAD structures (form I, mol B/C/D). (B) The ARTT loop from the C3E21N-free and C3E21N-NAD structures (form III, mol E) are superimposed on top of each other and on top of the C3wt-free-I structure (mol A). The NAD is shown for clarity.
