Figure 3.

A histidine-rich dehydrin from Arabidopsis thaliana HISTIDINE-RICH DEHYDRIN OF 11 KDA (HIRD11) (At1g54410) interacts with the Arabidopsis leucine-rich repeat receptor-like kinase (LRR-RLK) PHLOEM INTERCALATED WITH XYLEM-LIKE 1 (AtPXL1; AT1G08590). Plasma membrane-localized AtPXL1 phosphorylates (P) cytoplasmically localized (or plasma membrane associated?) HIRD11. At least, a sub-population of HIRD11 associates with the plasma membrane or AtPXL1 on the plasma membrane. The aP in a yellow circle represents the autocatalyzed phosphate group that is present on most LRR-RLK proteins, though this remains to be defined for this particular enzyme as present or as the phosphate group that gets transferred to the substrate.