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. 2014 Jan 6;5:3009. doi: 10.1038/ncomms4009

Table 2. Affinity for melibiose and Na+.

  Melibiose displacement of D2G (IC50, mM) Na+ activation constant for D2G FRET (K0.5, mM)
WT MelBSt 2.65±0.80* 1.92±0.78
R295C 4.04±0.42 3.22±1.07
R141C 5.93±1.61 4.77±0.39
R363C 2.83±0.57 5.51±1.07

D2G, 2′-(N-dansyl)aminoalkyl-1-thio-β-D-galactopyranoside; FRET, fluorescence resonance energy transfer; MelBSt, Salmonella typhimurium melibiose permease; WT, wild type.

*s.e.m., n=2.