Table 5. Dissociation Constants of RibU Variants with RBF at 20°C.

RibU variants	Binding affinity, Kd (nM) (Mean ± SD)a
5MeW	1.2 ± 0.1 (n = 2)
W	1.8 ± 0.8 (n = 3)
5FW	5.4 ± 1.0 (n = 4)
5,7diFW	8.2 ± 0.9 (n = 3)
5,6,7triFW	24.9 ± 2.7 (n = 2)

^a“SD”, standard deviation.