Figure 5.

Impact of additional labels on the relaxation time constants measured for the labeled oscillators at ∼1588 and 1608 cm⁻¹. The relaxation time constants for the single‐labeled residues (indicated by dashed boxes) are altered by interaction with an additional ¹³C=O. For the double‐labeled variants (indicated by solid boxes), smaller time constants are observed upon detection at ∼1588 cm⁻¹ (black, Leu4 and Val20, respectively), whereas the opposite effect occurs at ∼1608 cm⁻¹ (gray, Leu13).