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Abstract
We previously reported that Numb, a protein localized to clathrin-coated vesicles, regulates the membrane expression of metabotropic glutamate receptor 5 (mGluR5) and is critical to social behaviors. However, the distinct actions of Numb isoforms on mGluR5 have not been investigated. Here, we showed that the expression patterns of Numb-p72 and Numb-p65, two important isoforms of Numb, were distinct in HEK293T cells. Numb-p72, but not Numb-p65, bound to mGluR5α, and enhanced mGluR5 membrane expression by inhibiting its internalization. Our results suggest that a complete structure is required for Numb to bind to mGluR5 and to modulate mGluR5 trafficking.
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