Abstract
PROTEIN kinase C (PKC) transduces receptor-mediated signals by phosphorylating membrane-bound substrates which then act as effectors of specific cellular responses1. The myristoylated alanine-rich C kinase substrate (MARCKS) is a specific PKC substrate which has been implicated in macrophage activation, neurosecretion and growth factor-dependent mitogenesis2–5. Myristoylation of MARCKS is required for effective binding to the plasma membrane6 where it colocalizes with PKC7. Here we report that PKC-dependent phosphorylation displaces MARCKS from the membrane and that its subsequent dephosphorylation is accompanied by its reassociation with the membrane. This cycle of phosphorylation-dependent membrane attachment and detachment of a myristoylated protein represents a novel mechanism of reversible membrane targeting. As MARCKS is a calmodulin- and actin-binding protein (ref. 8, and J. Hartwig et al., manuscript submitted), the cycle of membrane attachment/detachment represents a mechanism through which PKC might reversibly regulate actin–membrane interaction.
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Thelen, M., Rosen, A., Nairn, A. et al. Regulation by phosphorylation of reversible association of a myristoylated protein kinase C substrate with the plasma membrane. Nature 351, 320–322 (1991). https://doi.org/10.1038/351320a0
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DOI: https://doi.org/10.1038/351320a0
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