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An enthalpic storage device for the chemical energy of ATP. (A) Structural superimposition of the nucleotide-free and ATP- and ADP-bound forms. For simplicity, only the structure of the ATP-bound form is shown as ribbons. Helix 6 of the nucleotide-free state is shown in green, for the ATP-bound state in red and for the ADP-bound state in blue. (B) 90° rotation in the plane with respect to panel A.
