Interactions of the developmental regulator ABI3 with proteins identified from developing Arabidopsis seeds

Authors

  • Smita Kurup,

    1. IACR-Long Ashton Research Station, Department of Agricultural Sciences, University of Bristol, Long Ashton, Bristol BS41 9AF, UK, and
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  • Huw D. Jones,

    1. Biochemistry and Physiology Department, IACR-Rothamsted, Harpenden, Herts AL5 2JQ, UK
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  • Michael John Holdsworth

    Corresponding author
    1. IACR-Long Ashton Research Station, Department of Agricultural Sciences, University of Bristol, Long Ashton, Bristol BS41 9AF, UK, and
      *For correspondence (fax +44 1275 394281; e-mail mike.holdsworth@bbsrc.ac.uk).
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*For correspondence (fax +44 1275 394281; e-mail mike.holdsworth@bbsrc.ac.uk).

Summary

The ABI3 locus is a major regulator of embryo development in Arabidopsis and is essential for the simultaneous activation of the maturation pathway, as well as repression of germination and seedling development. We used a two-hybrid screen in yeast in order to identify proteins that interact with ABI3. Four ABI3-interacting proteins (AIPs) were identified which showed specific in vivo and in vitro interactions with the C-terminal region of ABI3 that contains the B2 and B3 domains, previously shown to have DNA binding activity. The expression characteristics of the genes encoding the AIPs have also been analysed in wild-type and abi3, lec1 and fus3 embryo mutants. This analysis demonstrated differential expression of these genes during normal embryo development and in the mutant lines. All the AIPs show homology to existing transcription factors and therefore they may function with ABI3 within the network of transcriptional regulators that control embryo development in Arabidopsis.

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