FIGURE 3.

Distribution of backbone root-mean-square deviations of the major protomer structural regions from their configurations in the initial 3OTF structure, as observed in the context of the apo-monomer (black), holo-monomer (red), apo-tetramer (green), and holo-tetramer (blue) states of the HCN4 IR. a, root-mean-square deviations for the entire HCN4 IR; b, root-mean-square deviations for the tetramerization domain (TD), computed with structure overlay at the β-core; c, root-mean-square deviations for the CBD. d–f, distributions of root-mean-square deviations from the initial 3OTF structure computed for the major CBD α-subdomain structural regions: d, the PBC; e, the αB–αC region; and f, the N3A (i.e. αE′–αA region); all computed with structure overlay at the β-core. The color code is as in Fig. 1c. All boxplots were constructed using Origin 9.1 (OriginLab Corp.), based on the r.m.s.d. data from all protomers and replicates for the respective states. The statistics reported in each boxplot are as follows: the middle, bottom, and top lines of the central box represent the median, 25th percentile, and 75th percentile of the data set, respectively; the whiskers represent additional data falling within 1.5*IQR above the 75th percentile or below the 25th percentile (where IQR is the difference between the 75th and 25th percentiles); □ represents the mean of the data set; and the two × symbols represent the 1st and 99th percentiles of the data set.