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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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The yeast hnRNP-like protein Hrp1/Nab4 marks a transcript for nonsense-mediated mRNA decay.

The nonsense-mediated mRNA decay (NMD) pathway monitors premature translation termination and degrades aberrant mRNAs. In yeast, it has been proposed that a surveillance complex searches 3' of a nonsense codon for a downstream sequence element (DSE) associated with RNA-binding proteins. An interaction between the complex and the DSE-binding protein(s) triggers NMD. Here we describe the identification and characterization of the Hrp1/Nab4 protein as a DSE- binding factor that activates NMD. Mutations in HRP1 stabilize nonsense-containing transcripts without affecting the decay of wild-type mRNAs. Hrp1p binds specifically to a DSE-containing RNA and interacts with Upf1p, a component of the surveillance complex. A mutation in HRP1 that stabilizes nonsense-containing mRNAs abolishes its affinity for the DSE and fails to interact with Upf1p. We present a model describing how Hrp1p marks a transcript for rapid decay.[1]

References

  1. The yeast hnRNP-like protein Hrp1/Nab4 marks a transcript for nonsense-mediated mRNA decay. González, C.I., Ruiz-Echevarría, M.J., Vasudevan, S., Henry, M.F., Peltz, S.W. Mol. Cell (2000) [Pubmed]
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