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2 results for “JIP3”
Doublecortin and JIP3 are neural-specific counteracting regulators of dynein-mediated retrograde trafficking
Mutations in the microtubule (MT)-binding protein doublecortin (DCX) or in the MT-based molecular motor dynein result in lissencephaly. However, a functional link between DCX and dynein has not been defined. Here, we demonstrate that DCX negatively regulates dynein-mediated retrograde transport by reducing dynein's association with MTs and by disrupting the composition of the dynein motor complex. Previous work showed an increased binding of the adaptor protein C-Jun-amino-terminal kinase-interacting protein 3 (JIP3) to dynein in the absence of DCX. Using purified components, we demonstrate that JIP3 forms an active motor complex with dynein and its cofactor dynactin with two dyneins per complex. DCX competes with the binding of the second dynein, resulting in a velocity reduction of the complex. We conclude that DCX negatively regulates dynein-mediated retrograde transport through two critical interactions by regulating dynein binding to MTs and by regulating the association of JIP3 to the dynein motor complex.
Doublecortin and JIP3 are neural-specific counteracting regulators of dynein-mediated retrograde trafficking
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