Inhibition of nonsense-mediated mRNA decay (NMD) by a new chemical molecule reveals the dynamic of NMD factors in P-bodies |
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Authors: | Durand Sébastien Cougot Nicolas Mahuteau-Betzer Florence Nguyen Chi-Hung Grierson David S Bertrand Edouard Tazi Jamal Lejeune Fabrice |
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Institution: | Centre National de la Recherche Scientifique, Institut de Génétique Moléculaire de Montpellier, Université de Montpellier, Montpellier F-34293, France. |
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Abstract: | In mammals, nonsense-mediated mRNA decay (NMD) is a quality-control mechanism that degrades mRNA harboring a premature termination codon to prevent the synthesis of truncated proteins. To gain insight into the NMD mechanism, we identified NMD inhibitor 1 (NMDI 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 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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