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Related Experiment Videos

The solution structure of a specific GAGA factor-DNA complex reveals a modular binding mode

J G Omichinski1, P V Pedone, G Felsenfeld

  • 1Laboratories of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, USA.

Nature Structural Biology
|February 1, 1997
PubMed
Summary

The GAGA factor

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • The GAGA factor is a transcription factor involved in gene regulation.
  • Understanding its DNA binding mechanism is crucial for comprehending gene expression.
  • Chromatin remodeling plays a significant role in cellular processes.

Purpose of the Study:

  • To determine the structure of the GAGA factor DNA binding domain (GAGA-DBD) complex.
  • To elucidate the molecular interactions between GAGA-DBD and its consensus binding site.
  • To explore the implications of this structure for chromatin remodeling.

Main Methods:

  • Nuclear magnetic resonance (NMR) spectroscopy was employed to determine the complex structure.
  • Detailed structural analysis of the GAGA-DBD and its interaction with the oligonucleotide.

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Main Results:

  • The GAGA-DBD structure features a single Cys2-His2 zinc finger core and two basic regions (BR1 and BR2).
  • The zinc finger core binds the major groove, recognizing the first three GAG bases.
  • BR2 interacts in the major groove, recognizing the final G, while BR1 binds the minor groove, recognizing the fourth position's A.
  • This single-finger mechanism differs from other zinc finger proteins requiring multiple repeats for high-affinity binding.

Conclusions:

  • The GAGA-DBD utilizes a unique structural mechanism involving a single zinc finger and flanking basic regions for DNA binding.
  • This structural insight provides a basis for understanding GAGA factor's role in gene regulation and chromatin remodeling.
  • The findings contribute to the broader knowledge of transcription factor-DNA interactions and their functional consequences.