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Fig. 4. Effects of UNC-78 and UNC-60B on actin turnover as measured by nucleotide exchange. (A) F-actin (5 µM) was mixed with UNC-78 and/or UNC-60B as indicated in the figure in the presence of 40 µM
ATP, and the fluorescence (arbitrary units) of
ATP was monitored over time. (B) The data were fitted to exponential curves and the rates of increase in the fluorescence (
F/second) were calculated and plotted as a function of concentration of UNC-60B. Data shown are mean±s.d. of four experiments.