Mechanism of mRNA deadenylation: Evidence for a molecular interplay between translation termination factor eRF3 and mRNA deadenylases

Yuji Funakoshi, Yusuke Doi, Nao Hosoda, Naoyuki Uchida, Masanori Osawa, Ichio Shimada, Masafumi Tsujimoto, Tsutomu Suzuki, Toshiaki Katada, Shin Ichi Hoshino

研究成果: Article査読

122 被引用数 (Scopus)

抄録

In eukaryotes, shortening of the 3′-poly(A) tail is the rate-limiting step in the degradation of most mRNAs, and two major mRNA deadenylase complexes - Caf1-Ccr4 and Pan2-Pan3 - play central roles in this process, referred to as deadenylation. However, the molecular mechanism triggering deadenylation remains elusive. Previously, we demonstrated that eukaryotic releasing factor eRF3 mediates deadenylation and decay of mRNA in a manner coupled to translation termination. Here, we report the mechanism of mRNA deadenylation. The eRF3-mediated deadenylation is catalyzed by both Caf1-Ccr4 and Pan2-Pan3. Interestingly, translation termination complexes eRF1-eRF3, Pan2-Pan3, and Caf1-Ccr4 competitively interact with polyadenylate-binding protein PABPC1. In each complex, eRF3, Pan3, and Tob, respectively, mediate PABPC1 binding, and a combination of a PAM2 motif and a PABC domain is commonly utilized for their contacts. A translation-dependent exchange of eRF1-eRF3 for the deadenylase occurs on PABPC1. Consequently, PABPC1 binding leads to the activation of Pan2-Pan3 and Caf1-Ccr4. From these results, we suggest a mechanism of mRNA deadenylation by Pan2-Pan3 and Caf1-Ccr4 in cooperation with eRF3 and PABPC1.

本文言語English
ページ(範囲)3135-3148
ページ数14
ジャーナルGenes and Development
21
23
DOI
出版ステータスPublished - 2007 12 1
外部発表はい

ASJC Scopus subject areas

  • Genetics
  • Developmental Biology

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