TAP/NXF1, the primary mRNA export receptor, specifically interacts with a neuronal RNA-binding protein HuD

Biochemical and Biophysical Research Communications
Kuniaki SaitoHiroshi Sakamoto

Abstract

Hu proteins are RNA-binding proteins that are implicated in the control of stabilization, nuclear export, and/or translation of specific mRNAs with AU-rich elements (AREs) in the 3'-untranslated region. Three neuron-specific Hu proteins (HuD, HuB, and HuC), but not a ubiquitously expressed Hu protein HuR, have an activity to induce neurite outgrowth when they are overexpressed in a rat neuronal cell line PC12. Here we show that TAP/NXF1, the primary export receptor for the bulk mRNA, is a specific binding partner for HuD. In vitro binding experiments using recombinant proteins revealed that the interaction between TAP and HuD is direct and that HuD can form a ternary complex together with both TAP and RNA. Interestingly, HuR does not interact with TAP. These results suggest that HuD acts as a novel adaptor protein to recruit TAP for efficient export of ARE-containing mRNAs in neuronal cells.

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Apr 16, 2013·Trends in Cell Biology·Biljana Culjkovic-Kraljacic, Katherine L B Borden
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