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. Author manuscript; available in PMC: 2010 Mar 16.
Published in final edited form as: Chem Biol Interact. 2008 Oct 21;178(1-3):165–170. doi: 10.1016/j.cbi.2008.10.016

Fig. 3. Kinetics of NADP+ binding to Kvβ2.

Fig. 3

A. Time-dependent changes in Kvβ2 fluorescence quenching upon addition of NADP+. NADP+ at the indicated concentrations was added at room temperature to the nucleotide-free Kvβ2 (0.21 μM) in a stirred quartz fluorimeter cuvette and the decrease in protein fluorescence (ex. 290 nm; em. 335 nm) was monitored for 250 s. Dots represent experimental points and lines are the best fits of a two-exponential equation (eq. 2) to the data. B, C. The fast (B) and slow (C) exponential constants are plotted against NADP+ concentration. Data are shown as mean ± standard error determined with at least 3 replicates. The line in panel B is the best fit of eq. 3–4 to the data. Because kslow showed no dependence on NADP+ concentration the line in panel C is the average of the data.