Fig. 4: Analysis of TrkB activity and oligomerization for wild-type and single-point S441A/I mutants.

a, c, d Dose-dependent phosphorylation of Y516 and Y706/607. b, e, f Activation of ERK and AKT cascades before, 5 and 15 min after BDNF stimulation. Data are shown as mean values ± SD. n ≥ 3 biological replicates (each dot represents one independent replicate). Statistical significance is provided according to the independent two-sided t-test (*p < 0.05, **p < 0.01, ***p < 0.001, ****p < 0.0001, ns denotes that changes with respect to the wt are not significant, if not otherwise indicated). g Analysis of oligomerization of TrkB-ECTM-mEYFP constructs in cells by Number&Brightness (see Methods section for more details). Statistical significance is determined using a non-parametric one-way ANOVA (Kruskal-Wallis test) followed by Dunn’s multiple comparisons test. n ≥ 2 replicates and n ≥ 37 points for each construct. The box plots were constructed with the upper box limit being the 75th percentile, the lower box being the 25th percentile, and the whiskers representing a 95% confidence interval. The mean is the open point, and the median is the horizontal line in the box. Statistical analysis results are shown in Supplementary Table 1. Source data are provided as a Source Data file.