CRMP-4 is a cytosolic phosphoprotein known to regulate cytoskeletal dynamics and is a known physiological substrate of GSK3. It has been shown to promote F-actin bundling. Furthermore, CRMP4, but not other CRMP family members, binds to RhoA, an important regulator of cell cycle progression and cytokinesis. These observations show that CRMP4 plays a role in regulating microtubule dynamics during mitosis (1). CRMP4 also influences neurite outgrowth (2). Thus, CRMP4 is involved in semaphorin-induced growth cone collapse and axonal guidance in developing neurons (3).
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