Interacts with ADO2/LKP2, CPK11 and CPK4. Weak interaction with CPK12 and no interactions with CPK1, CPK5 or CPK26. A number of isoforms are produced. According to EST sequences. Expressed in seedlings, roots, leaves, stems, flowers and siliques. By drought stress, but not by abscisic acid. The NLS/NES region (98-121) is necessary and sufficient for interaction with CPK11. Phosphorylated within the NLS/NES region. Belongs to the Di19 family.