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Identification of Arabidopsis Transcriptional Regulators by Yeast One-Hybrid Screens Using a Transcription Factor ORFeome

  • Ghislain BretonEmail author
  • Steve A. Kay
  • José L. Pruneda-Paz
Protocol
Part of the Methods in Molecular Biology book series (MIMB, volume 1398)

Abstract

Genetic and molecular approaches revealed that the circadian clock network structure is comprised of several interlocked positive and negative transcriptional feedback loops. The network evolved to sense and integrate inputs from environmental cues to adjust daily rhythms in physiological processes. Compiling evidence indicates that part of this regulation happens at the transcriptional level through subtle adjustments in the expression of core clock genes. Thus, to better understand the network and identify the molecular mechanisms of clock input pathways, it is imperative to determine how core clock genes are regulated. For this purpose we developed reagents for an unbiased approach to identify transcription factors (TFs) interacting with the promoters of core clock genes. At the center of this approach lies the yeast one-hybrid (Y1H) assay in which a pool of proteins fused to the GAL4 transcriptional activation domain are tested for their ability to interact with a selected promoter fragment in yeast cells. Taking advantage of the fact that Arabidopsis TF genes are well annotated, we generated a comprehensive TF clone collection (TF ORFeome) and used it to replace the standard cDNA pool strategy traditionally used in Y1H screens. The use of this TF clone collection substantially accelerates the comprehensive discovery of promoter-specific DNA binding activities among all Arabidopsis TFs. Considering that this strategy can be extended to the study of the promoter interactome of any Arabidopsis gene, we developed a low throughput protocol that can be universally implemented to screen the ~2000 TF clone library.

Key words

Yeast one-hybrid Transcription factor ORFeome Circadian clock Cis-regulatory network Protein–DNA interaction β-galactosidase reporter Plant genomics 

Notes

Acknowledgements

We thank Katia Bonaldi and Dawn H. Nagel for critical reading of the manuscript. The research reported in this publication was supported by the National Institute of General Medical Sciences, NIH, under grants R01GM056006, R01GM067837, and RC2GM092412 to S. A. K. and R01GM056006 to J. L. P.-P. as a coinvestigator.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Ghislain Breton
    • 1
    Email author
  • Steve A. Kay
    • 2
  • José L. Pruneda-Paz
    • 3
    • 4
  1. 1.Department of Integrative Biology and PharmacologyUniversity of Texas Health Science Center at HoustonHoustonUSA
  2. 2.Molecular and Computational Biology SectionUniversity of Southern CaliforniaLos AngelesUSA
  3. 3.Division of Biological SciencesUniversity of California San DiegoLa JollaUSA
  4. 4.Center for ChronobiologyUniversity of California San DiegoLa JollaUSA

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