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Transcriptional activation of the maize endosperm transfer cell-specific gene BETL1 by ZmMRP-1 is enhanced by two C2H2 zinc finger-containing proteins

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Abstract

ZmMRP-1 is a single MYB-domain transcription factor specifically expressed in the transfer cell layer of the maize endosperm, where it directly regulates the expression of a number of transfer cell specific genes and very likely contributes to the regulation of the transfer cell differentiation process. It is still a matter of debate, however, how this type of transcription factors interact with the promoter sequences they regulate. In this work we have investigated the existence of proteins interacting with ZmMRP-1 in the transfer cell nuclei. In a yeast double-hybrid screen we identified two related maize proteins, ZmMRPI-1 and ZmMRPI-2 belonging to the C2H2 zinc finger protein family, which interact with ZmMRP-1 and modulate its activity on transfer cell specific promoters. Two ZmMRPI orthologous genes were also identified in the rice and Arabidopsis genomes. The expression pattern in maize and Arabidopsis suggest a role for these proteins in gene regulation at the exchange surfaces where ZmMRP-1 is expressed providing the first indication of their function. We show that this previously uncharacterized family of proteins encodes nuclear proteins that interact with MYB-related transcription factors through their C-terminal conserved domain.

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Abbreviations

ANOVA:

Analysis of variance

DAP:

Days after pollination

DMSO:

Dimethyl sulfoxide

EMSA:

Electrophoretic mobility shift assay

GFP:

Green fluorescent protein

GUS:

Beta-glucuronidase

mCherry:

mCherry fluorescent protein

MS:

Murashige and Skoog

PEG:

Polyethylene glycol

ZmMRP-1:

Zea mays MYB-related protein 1

ZmMRPI-1:

ZmMRP-1 interactor-1

ZmMRPI-2:

ZmMRP-1 interactor-2

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Acknowledgments

We thank Dr. R.D. Thompson (INRA Unité Mixte de Recherches en Génétique et Ecophysiologie des légumineuses à graines, Dijon, France) for his generous donation of a cDNA library. This work was supported by Spanish Ministerio de Educación y Ciencia (BIO2003-03721 and BIO2006-14190 to G. Hueros).

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Correspondence to Gregorio Hueros.

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Royo, J., Gómez, E., Barrero, C. et al. Transcriptional activation of the maize endosperm transfer cell-specific gene BETL1 by ZmMRP-1 is enhanced by two C2H2 zinc finger-containing proteins. Planta 230, 807–818 (2009). https://doi.org/10.1007/s00425-009-0987-2

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