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Related Experiment Videos

The CCAAT binding factor can mediate interactions between CONSTANS-like proteins and DNA.

Orna Ben-Naim1, Ravit Eshed, Anna Parnis

  • 1Department of Biology, Technion-Israel Institute of Technology, Haifa 32000, Israel.

The Plant Journal : for Cell and Molecular Biology
|April 21, 2006
PubMed
Summary

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Plant CONSTANS-Like (COL) proteins lack DNA-binding motifs. They interact with CCAAT binding factors (CBFs) to bind DNA, regulating gene expression and flowering time in plants.

Area of Science:

  • Plant molecular biology
  • Transcriptional regulation
  • Plant development

Background:

  • CONSTANS-Like (COL) proteins are plant-specific nuclear regulators controlling gene expression but lack DNA-binding domains.
  • The mechanism by which COL proteins are recruited to specific DNA cis-acting elements remains unclear.
  • COL proteins, such as Arabidopsis thaliana CONSTANS (AtCO), play crucial roles in developmental processes like flowering time control.

Purpose of the Study:

  • To investigate how COL proteins are targeted to specific DNA sequences.
  • To identify potential DNA-binding partners of COL proteins.
  • To elucidate the role of CCAAT binding factors (CBFs) in COL protein function.

Main Methods:

  • Protein-protein interaction screening and assays.

Related Experiment Videos

  • Analysis of the CCT domain's binding activity.
  • Chromatin immunoprecipitation (ChIP) to assess in vivo DNA binding.
  • Functional analysis of mutated COL and CBF proteins in Arabidopsis.

    • Main Results:

    • The CCT (CO, CO-like, TIMING OF CAB EXPRESSION 1) domain of both Tomato COL1 (TCOL1) and AtCO binds to the HAP5/NF-YC component of the trimeric CCAAT binding factor (CBF).
    • Chromatin immunoprecipitation confirmed that HAP5 recruits TCOL to CCAAT motifs in yeast promoters.
    • Expression of a tomato HAP5 gene reduced flowering time in Arabidopsis, and mutations in the CCT domain disrupted TCOL-HAP5 interaction and impaired AtCO function.

    Conclusions:

    • CCAAT binding factors (CBFs) likely recruit COL proteins to their DNA target motifs within plant cells.
    • This interaction is essential for the function of COL proteins in regulating gene expression and developmental processes, such as flowering time.
    • The findings reveal a novel mechanism for targeted gene regulation by plant-specific transcription factors.