Arabidopsis Pumilio protein APUM5 suppresses Cucumber mosaic virus infection via direct binding of viral RNAs

Sung Un Huh, Min Jung Kim, Kyung Hee Paek

Research output: Contribution to journalArticle

28 Citations (Scopus)


Posttranscriptional/translational regulation of gene expression is mediated by diverse RNA binding proteins and plays an important role in development and defense processes. Among the RNA-binding proteins, the mammalian Pumilio RNA-binding family (Puf) acts as posttranscriptional and translational repressors. An Arabidopsis Puf mutant, apum5-D , was isolated during a T-DNA insertional mutant screen for mutants with reduced susceptibility to Cucumber mosaic virus (CMV) infection. Interestingly, CMV RNA contained putative Pumilio-homology domain binding motifs in its 3′ untranslated region (UTR) and internal places in its genome. APUM5 directly bound to the 3′ UTR motifs and some internal binding motifs in CMV RNAs in vitro and in vivo. We showed that APUM5 acts as a translational repressor that regulates the 3′ UTR of CMV and affects CMV replication. This study uncovered a unique defense system that Arabidopsis APUM5 specifically regulates CMV infection by the direct binding of CMV RNAs.

Original languageEnglish
Pages (from-to)779-784
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number2
Publication statusPublished - 2013 Jan 8



  • Plant defense
  • Pumilio RNA binding protein
  • TuMV

ASJC Scopus subject areas

  • General

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