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Journal of Plant Research

, Volume 125, Issue 5, pp 679–692 | Cite as

The Arabidopsis thaliana SET-domain-containing protein ASHH1/SDG26 interacts with itself and with distinct histone lysine methyltransferases

  • María del Pilar Valencia-Morales
  • José Alberto Camas-Reyes
  • José Luis Cabrera-Ponce
  • Raúl Alvarez-Venegas
Regular Paper

Abstract

Polycomb group (PcG) and trithorax group (trxG) proteins are key regulators of homeotic genes and have central roles in cell proliferation, growth and development. In animals, PcG and trxG proteins form higher order protein complexes that contain SET domain proteins with histone methyltransferase activity, and are responsible for the different types of lysine methylation at the N-terminal tails of the core histone proteins. However, whether H3K4 methyltransferase complexes exist in Arabidopsis thaliana remains unknown. Here, we make use of the yeast two-hybrid system and the bimolecular fluorescence complementation assay to provide evidence for the self-association of the Arabidopsis thaliana SET-domain-containing protein SET DOMAIN GROUP 26 (SDG26), also known as ABSENT, SMALL, OR HOMEOTIC DISCS 1 HOMOLOG 1 (ASHH1). In addition, we show that the ASHH1 protein associates with SET-domain-containing sequences from two distinct histone lysine methyltransferases, the ARABIDOPSIS HOMOLOG OF TRITHORAX-1 (ATX1) and ASHH2 proteins. Furthermore, after screening a cDNA library we found that ASHH1 interacts with two proteins from the heat shock protein 40 kDa (Hsp40/DnaJ) superfamily, thus connecting the epigenetic network with a system sensing external cues. Our findings suggest that trxG complexes in Arabidopsis thaliana could involve different sets of histone lysine methyltransferases, and that these complexes may be engaged in multiple developmental processes in Arabidopsis.

Keywords

ASHH1 Arabidopsis Trithorax-group SET-domain Histone methyltransferases 

Notes

Acknowledgments

We thank Laura Aguilar-Henonin and Plinio Guzmán-Villate for their helpful advice during the Y2HS assays. These studies were supported by CONACYT, grant CB-2006/55028 to RA-V.

Supplementary material

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Supplementary material 1 (DOCX 1,372 kb)
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Supplementary material 2 (DOCX 15 kb)
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Supplementary material 3 (DOC 32 kb)
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Supplementary material 4 (DOCX 22 kb)

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Copyright information

© The Botanical Society of Japan and Springer 2012

Authors and Affiliations

  • María del Pilar Valencia-Morales
    • 1
  • José Alberto Camas-Reyes
    • 1
  • José Luis Cabrera-Ponce
    • 1
  • Raúl Alvarez-Venegas
    • 1
  1. 1.Departamento de Ingeniería GenéticaCINVESTAV Unidad IrapuatoIrapuatoMexico

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