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The plant symbiotic kinase CCaMK integrates calcium binding and calmodulin-dependent regulation. Its activation can connect nuclear calcium signaling to symbiotic developmental programs.

A kinase with an intrinsic calcium-sensing regulatory region. Calcium binding can relieve autoinhibition and couple calcium signaling to substrate phosphorylation.

The divalent cation ${\mathrm{Ca}}^{2+}$. Changes in its free intracellular concentration participate in calcium signaling; total cellular calcium includes substantial bound and sequestered pools.

A plant kinase recruited and regulated by a calcineurin B-like protein. The separate sensor and kinase provide a modular route from calcium signaling to regulation of transport and other targets.