Figure 5.

Three typical buildup curves of the symmetrical reconversion ratio of eq 1, with their best-fit curves and the structure of ubiquitin. Filled red circles and the solid red line correspond to the C′C^α pair of glutamine Q31 observed through the NH^N pair of aspartate D32 (σ_CR = (10.9 ± 0.12 × 10⁻² s⁻¹). Blue crosses and the dashed blue line correspond to the C′C^α pair of leucine L8 observed through the signal of threonine T9 (σ_CR = (9.07 ± 0.09) × 10⁻² s⁻¹). Filled green squares and the dotted green line correspond to the C^αC′ pair of arginine R74 observed through the signal of glycine G75 (σ_CR = (2.33 × 0.02) × 10⁻² s⁻¹). The structure of ubiquitin³⁹ was generated with MOLMOL.⁴⁰