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Plant Molecular Biology

, Volume 62, Issue 4–5, pp 637–653 | Cite as

Systematic identification of factors involved in post-transcriptional processes in wheat grain

  • Sergiy LopatoEmail author
  • Ljudmilla Borisjuk
  • Andrew S. Milligan
  • Neil Shirley
  • Natalia Bazanova
  • Peter Langridge
Article

Abstract

Post-transcriptional processing of primary transcripts can significantly affect both the quantity and the structure of mature mRNAs and the corresponding protein products. It is an important mechanism of gene regulation in animals, yeast and plants. Here we have investigated the interactive networks of pre-mRNA processing factors in the developing grain of wheat (Triticum aestivum), one of the world’s major food staples. As a first step we isolated a homologue of the plant specific AtRSZ33 splicing factor, which has been shown to be involved in the early stages of embryo development in Arabidopsis. Real-time PCR showed that the wheat gene, designated TaRSZ38, is expressed mainly in young, developing organs (flowers, root, stem), and expression peaks in immature grain. In situ hybridization and immunodetection revealed preferential abundance of TaRSZ38 in mitotically active tissues of the major storage organ of the grain, the endosperm. The protein encoded by TaRSZ38 was subsequently used as a starting bait in a two-hybrid screen to identify additional factors in grain that are involved in pre-mRNA processing. Most of the identified proteins showed high homology to known splicing factors and splicing related proteins, supporting a role for TaRSZ38 in spliceosome formation and 5′ site selection. Several clones were selected as baits in further yeast two-hybrid screens. In total, cDNAs for 16 proteins were isolated. Among these proteins, TaRSZ22, TaSRp30, TaU1-70K, and the large and small subunits of TaU2AF, are wheat homologues of known plant splicing factors. Several, additional proteins are novel for plants and show homology to known pre-mRNA splicing, splicing related and mRNA export factors from yeast and mammals.

Keywords

Grain development Pre-mRNA processing factors Protein–protein interaction Splicing Yeast two-hybrid system 

Abbreviations

AD

Activation domain

BD

Binding domain

DAP

Days after pollination

dbEST

GenBank expressed sequence tag database

GUS

β-Glucuronidase

NEB

Nuclei extraction buffer

NLS

Nuclear localization signal

NMD

Nonsense mediated decay

RRM

RNA recognition motif

RSZproteins

Arginine/serine proteins with one or two zinc fingers

SCL proteins

SC35-like proteins

SD domains

Serine/aspartic acid rich domains

snRNPs

Small nuclear ribonucleoprotein particles

SR domains

Serine/arginine rich domains

TRN-SR

Transportin-SR

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Notes

Acknowledgments

We thank Ursula Langridge for assistance with growing plants in the glasshouse. This work was supported by the Australian Grain Research and Development Corporation (grant no. UA00083 to P.L.).

Supplementary material

11103_2006_9046_MOESM1_ESM.doc (332 kb)
Supplementary material
11103_2006_9046_MOESM2_ESM.doc (50 kb)
Supplementary material

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Copyright information

© Springer Science+Business Media B.V. 2006

Authors and Affiliations

  • Sergiy Lopato
    • 1
    Email author
  • Ljudmilla Borisjuk
    • 2
  • Andrew S. Milligan
    • 1
  • Neil Shirley
    • 1
  • Natalia Bazanova
    • 1
  • Peter Langridge
    • 1
  1. 1.Australian Centre for Plant Functional GenomicsThe University of AdelaideGlen OsmondAustralia
  2. 2.Institut fur Pflanzengenetik und KulturpflanzenforschungGaterslebenGermany

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