Plant Molecular Biology

, Volume 85, Issue 4, pp 381-394

First online:

Characterization of RNA binding protein RBP-P reveals a possible role in rice glutelin gene expression and RNA localization

  • Kelly A. DoroshenkAffiliated withInstitute of Biological Chemistry, Washington State University
  • , Li TianAffiliated withInstitute of Biological Chemistry, Washington State University
  • , Andrew J. CroftsAffiliated withInstitute of Biological Chemistry, Washington State UniversityInternational Liberal Arts Program, Akita International University
  • , Toshihiro KumamaruAffiliated withFaculty of Agriculture, Kyushu University
  • , Thomas W. OkitaAffiliated withInstitute of Biological Chemistry, Washington State University Email author 

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RNA binding proteins (RBPs) play an important role in mRNA metabolism including synthesis, maturation, transport, localization, and stability. In developing rice seeds, RNAs that code for the major storage proteins are transported to specific domains of the cortical endoplasmic reticulum (ER) by a regulated mechanism requiring RNA cis-localization elements, or zipcodes. Putative trans-acting RBPs that recognize prolamine RNA zipcodes required for restricted localization to protein body-ER have previously been identified. Here, we describe the identification of RBP-P using a Northwestern blot approach as an RBP that recognizes and binds to glutelin zipcode RNA, which is required for proper RNA localization to cisternal-ER. RBP-P protein expression coincides with that of glutelin during seed maturation and is localized to both the nucleus and cytosol. RNA-immunoprecipitation and subsequent RT-PCR analysis further demonstrated that RBP-P interacts with glutelin RNAs. In vitro RNA–protein UV-crosslinking assays showed that recombinant RBP-P binds strongly to glutelin mRNA, and in particular, 3′ UTR and zipcode RNA. RBP-P also exhibited strong binding activity to a glutelin intron sequence, suggesting that RBP-P might participate in mRNA splicing. Overall, these results support a multifunctional role for RBP-P in glutelin mRNA metabolism, perhaps in nuclear pre-mRNA splicing and cytosolic localization to the cisternal-ER.


Rice RNA binding protein RNA localization Zipcode Storage protein Glutelin