Extended Data Fig. 8. Positively selected residues on the FLS2 concave surface are located near the flg22 C-terminus or SERK3.
a, dN/dS of each FLS2 concave-surface residue in relation to its minimal distance to flg22. The top part are the marginal density distributions of minimal distances for residues under positive selection (dN/dS > 1, blue) versus purifying/neutral selection (dN/dS ≤ 1, gray). The bottom part presents a scatter plot of all FLS2 concave-surface residues, color-coded by whether dN/dS ≤ 1 (gray) or dN/dS > 1 and closest to flg22 (blue). b, dN/dS of each FLS2 concave-surface residue in relation to its minimal distance to SERK3. The top part are the marginal density distributions of minimal distances for residues under positive selection (dN/dS > 1, gold) versus purifying/neutral selection (dN/dS ≤ 1, gray). The bottom part presents a scatter plot of all FLS2 concave-surface residues, color-coded by whether dN/dS ≤ 1 (gray) or dN/dS > 1 and closest to flg22 (gold). Residues with a high probability (BEB probability > 0.95) of being under positive selection are shown in red. LRRs 10–20, corresponding to the flg22 C-terminus and SERK3-binding region, are outlined in black. The dashed red line at dN/dS = 1 indicates the threshold between purifying/neutral and diversifying selection. Distances are shown in Å. dN/dS for each residue was calculated as described in (Fig. 6a), then mapped onto the structural models shown in (Fig. 6f–h). Minimal atom–atom distances between each FLS2 residue and flg22/SERK3 were extracted from the same structural models.
