Figure 5
(a) Saturation binding curve of purified EmrE in detergent solution. Kd values were determined by nonlinear regression using a single-site model as indicated by the linearity of the Scatchard plot (inset). (b) Determination of the ratio of TPP+ binding to EmrE. The concentration of EmrE in the experiment was determined by amino-acid analysis to be 80.5 µM and the intersection between the linear portions of the graph occurs at a TPP+ concentration of 40 µM. The negligible increase in binding at 2.8 mM EmrE implies that there are no significant amounts of misfolded EmrE present in the purified sample. Reprinted from Tate et al. (2003), with permission from Elsevier. |