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Dual Fatty Acyl Modification Determines the Localization and Plasma Membrane Targeting of CBL/CIPK Ca^sup 2+^ Signaling Complexes in Arabidopsis(W)

Arabidopsis thaliana calcineurin B-like proteins (CBLs) interact specifically with a group of CBL-interacting protein kinases (CIPKs). CBL/CIPK complexes phosphorylate target proteins at the plasma membrane. Here, we report that dual lipid modification is required for CBL1 function and for locali zation of this calcium sensor at the plasma membrane. First, myristoylation targets CBL1 to the endoplasmic reticulum. Second, S-acylation is crucial for endoplasmic reticulum-toplasma membrane trafficking via a novel cellular targeting pathway that is insensitive to brefeldin A. We found that a 12-amino acid peptide of CBL1 is sufficient to mediate dual lipid modification and to confer plasma ...

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