Figure 7

Iron decreases the kinetic rates for the binding of APP IRE mRNA to IRP1. Representative kinetic data show the time-dependent decrease in fluorescence intensity caused by binding of APP mRNA and APP mRNA-Fe2+ with IRP1. APP mRNA and IRP1 concentration were 500 nM and 100 nM (final), and the Fe2+ concentration was 50 μM (final). The solid line represents the fitted curve for a single-exponential function. The residual for the exponential fits is shown in lower panels.