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Related Experiment Videos

Cooperative DNA binding and sequence discrimination by the Opaque2 bZIP factor

J A Yunes1, A L Vettore, M J da Silva

  • 1Centro de Biologia Molecular e Engenharia Genética, Universidade Estadual de Campinas, 13083-970, Campinas, SP, Brazil.

The Plant Cell
|November 13, 1998
PubMed
Summary

The maize Opaque2 (O2) protein binds cooperatively to two adjacent sites in the alpha-coixin promoter. This cooperative binding enhances gene expression, with one site being more critical for activity.

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Area of Science:

  • Molecular Biology
  • Plant Genetics
  • Transcription Factor Research

Background:

  • The maize Opaque2 (O2) protein is a transcription factor regulating endosperm gene expression.
  • O2 recognizes specific DNA sequences (cis-acting elements) in gene promoters.
  • Understanding O2 binding is crucial for maize endosperm development.

Purpose of the Study:

  • To analyze the O2 target region in the alpha-coixin gene promoter.
  • To investigate the binding mechanism and functional significance of O2 interaction with its target sites.
  • To elucidate the role of cooperative binding and site architecture in transcriptional regulation.

Main Methods:

  • Detailed analysis of the O2 target region in the alpha-coixin promoter.
  • Quantitative DNase footprint analysis to study O2 DNA binding.

Related Experiment Videos

  • Transient expression assays in tobacco protoplasts to assess enhancer activity.

    • Main Results:

    • The O2 target region contains two adjacent binding sites, O2u and O2d.
    • O2 binding to these sites follows a cooperative model.
    • The two sites act synergistically to enhance gene expression.
    • O2 binding at the O2u site is more critical for enhancer activity than O2d.

    Conclusions:

    • Cooperative DNA binding of O2 is essential for synergistic transcriptional activation.
    • The specific architecture of the O2-DNA complex influences interaction with the transcriptional machinery.
    • This study provides insights into the molecular mechanisms of O2-mediated gene regulation in maize.