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Inhibition of nonsense-mediated mRNA decay (NMD) by a new chemical molecule reveals the dynamic of NMD factors in P-bodies. Inhibition of nonsense-mediated mRNA decay (NMD) by a new chemical molecule reveals the dynamic of NMD factors in P-bodies: P-body components dynamics

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Durand, Sébastien | Cougot, Nicolas | Mahuteau-Betzer, Florence | Nguyen, Chi-Hung | Grierson, David, S. | Bertrand, Edouard | Tazi, Jamal | Lejeune, Fabrice

Edité par CCSD ; Rockefeller University Press -

International audience. In mammals, nonsense-mediated mRNA decay (NMD) is a quality control mechanism that degrades mRNAs harboring a premature termination codon, in order to prevent the synthesis of truncated proteins. To gain insight into NMD mechanism, we identified NMDI 1 (for nonsense-mediated mRNA decay inhibitor 1) as a small molecule inhibitor of the NMD pathway. We characterized the mode of action of this compound and demonstrated that it acts upstream of hUPF1. NMDI 1 induced the loss of interactions between hSMG5 and hUPF1 and the stabilization of hyperphosphorylated isoforms of hUPF1. Incubation of cells with NMDI 1 allowed us to demonstrate that NMD factors and mRNAs subject to NMD transit through processing bodies (P-bodies) as it is the case in yeast. The results suggest a model in which mRNA and NMD factors are sequentially recruited to P-bodies.

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