MARCKS (Myristoylated alanine-rich protein kinase C substrate) is a major PKC substrate that is distributed in various cell types. MARCKS has been implicated in cell motility, cell adhesion, phagocytosis, membrane traffic and mitogenesis. PKC phosphorylates Ser152, 156 and 163 of MARCKS, which regulates MARCKS's calcium/calmodulin binding activity and filamentous (F)-actin cross-linking activity. In addition, phosphorylation by PKC results in translocation of MARCKS from membrane to cytoplasm.