Table 1: Apparent Rate Constants (k)a for Binding Reactions between H272F-based Variants and Haloalkane Ligands as Determined by FP

Variant k(TMR-ligand) k(FAM-ligand)
HT2 3.0 x 106 1.6 x 104
HT3 4.0 x 106 2.9 x 104
HT6 1.1 x 107 6.7 x 105
HT7 1.9 x 107 2.0 x 106

a Rate constants (M-1sec-1 at 25 °C) were calculated from the second-order rate equation (see reference 24).