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The Srx-Prx interface in complex with ATP and Mg2+. A, stereoview of a simulated-annealing, omit |Fo − Fc| electron density map (gray) contoured at 3σ in the active site of Srx (cyan) and the substrate Prx (dark green). The ATP molecule and Mg2+ ion are colored as described previously; water molecules are shown as red spheres. B, hydrogen-bonding interactions (yellow dashed lines) between the ATP molecule, Mg2+ ion, Srx, and Prx.
