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. 2014 May 14;5:187. doi: 10.3389/fpls.2014.00187

Figure 10.

Figure 10

Key regulatory residues at the C-terminus of Arabidopsis SOS1 (AtSOS1) are conserved in Physcomitrella homologs. The full-length protein sequence alignment is shown on top with the zoomed in region indicated by a shaded box. Arabidopsis CIPK24 (SOS2) phosphorylates the serine (S) residue marked in red in AtSOS1 and facilitates binding by a 14-3-3 protein. In Arabidopsis, these mechanisms are critical to plant sodium tolerance. Strong sequence conservation suggest similar mechanisms may be in place in Physcomitrella, though the cognate CBL-CIPK pair is currently unknown.