Multifunctional rna binding protein ostudor-sn in storage protein mrna transport and localization

Hong Li Chou, Li Tian, Toshihiro Kumamaru, Shigeki Hamada, Thomas W. Okita

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)


The multifunctional RNA-binding protein Tudor-SN plays multiple roles in transcriptional and posttranscriptional processes due to its modular domain structure, consisting of four tandem Staphylococcus nuclease (SN)-like domains (4SN), followed by a carboxyl-terminal Tudor domain, followed by a fifth partial SN sequence (Tsn). In plants, it confers stress tolerance, is a component of stress granules and P-bodies, and may participate in stabilizing and localizing RNAs to specific subdomains of the cortical-endoplasmic reticulum in developing rice (Oryza sativa) endosperm. Here, we show that, in addition to the intact rice OsTudor-SN protein, the 4SN and Tsn modules exist as independent polypeptides, which collectively may coassemble to form a complex population of homodimer and heteroduplex species. The 4SN and Tsn modules exhibit different roles in RNA binding and as a protein scaffold for stress-associated proteins and RNA-binding proteins. Despite their distinct individual properties, mutations in both the 4SN and Tsn modules mislocalize storage protein mRNAs to the cortical endoplasmic reticulum. These results indicate that the two modular peptide regions of OsTudor-SN confer different cellular properties but cooperate in mRNA localization, a process linking its multiple functions in the nucleus and cytoplasm.

Original languageEnglish
Pages (from-to)1608-1623
Number of pages16
JournalPlant physiology
Issue number4
Publication statusPublished - Dec 2017

All Science Journal Classification (ASJC) codes

  • Physiology
  • Genetics
  • Plant Science


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