Structural basis of the PNRC2-mediated link between mRNA surveillance and decapping

Tingfeng Lai, Hana Cho, Zhou Liu, Matthew W. Bowler, Shunfu Piao, Roy Parker, Yoon Ki Kim, Haiwei Song

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56 Citations (Scopus)


Nonsense-mediated mRNA decay (NMD) is an important mRNA surveillance system, and human PNRC2 protein mediates the link between mRNA surveillance and decapping. However, the mechanism by which PNRC2 interacts with the mRNA surveillance machinery and stimulates NMD is unknown. Here, we present the crystal structure of Dcp1a in complex with PNRC2. The proline-rich region of PNRC2 is bound to the EVH1 domain of Dcp1a, while its NR-box mediates the interaction with the hyperphosphorylated Upf1. The mode of PNRC2 interaction with Dcp1a is distinct from those observed in other EVH1/proline-rich ligands interactions. Disruption of the interaction of PNRC2 with Dcp1a abolishes its P-body localization and ability to promote mRNA degradation when tethered to mRNAs. PNRC2 acts in synergy with Dcp1a to stimulate the decapping activity of Dcp2 by bridging the interaction between Dcp1a and Dcp2, suggesting that PNRC2 is a decapping coactivator in addition to its adaptor role in NMD.

Original languageEnglish
Pages (from-to)2025-2037
Number of pages13
Issue number12
Publication statusPublished - 2012 Dec 5

Bibliographical note

Funding Information:
We thank Dr. Jens Lykke-Andersen for plasmids used in the tethering experiments. This work is supported by the Agency for Science, Technology and Research in Singapore (to H.S.) and partly by Zhejiang Provincial Natural Science Foundation of China (Grant no. LZ12C05001).

ASJC Scopus subject areas

  • Structural Biology
  • Molecular Biology


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