Figure 5.

(a) Mapping of amide groups showing ¹H longitudinal relaxation enhancements (ΔR₁ ≥ 4 s⁻¹, red; 2 s⁻¹ ≤ ΔR₁ < 4 s⁻¹, orange). Data were obtained at 6.4 mM of O₂ concentration. Amide groups showing large relaxation enhancements (ΔR₁ ≥ 4 s⁻¹) are labeled with residue number. (b) Mapping of methyl groups showing ¹H longitudinal relaxation enhancements (ΔR₁ ≥ 10 s⁻¹, red; 4 s⁻¹ ≤ ΔR₁ < 10 s⁻¹, orange). Data were obtained at 3.8 mM of O₂ concentration. Methyl groups showing severe line-broadening are depicted by gray sticks. The picture was prepared using MOLMOL⁶².