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Related Experiment Videos

SKN-1 domain folding and basic region monomer stabilization upon DNA binding

A S Carroll1, D E Gilbert, X Liu

  • 1Center for Blood Research and Department of Pathology, Harvard Medical School, Boston, Massachusetts 02115, USA.

Genes & Development
|September 26, 1997
PubMed
Summary

The SKN-1 transcription factor binds DNA as a monomer, unlike typical bZIP proteins. Its unique Skn domain uses a support segment and flexible arm to stabilize DNA binding, revealing conserved mechanisms for transcription factor function.

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Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Structural Biology

Background:

  • SKN-1 is a transcription factor crucial for early cell fate determination in *C. elegans*.
  • Unlike most basic-leucine zipper (bZIP) proteins that dimerize for DNA binding, SKN-1 binds DNA as a monomer.
  • Understanding the structural basis of SKN-1's monomeric DNA binding is key to deciphering its regulatory role.

Purpose of the Study:

  • To investigate the structural mechanisms by which the SKN-1 DNA-binding domain (Skn domain) achieves stable monomeric DNA binding.
  • To elucidate the roles of the flexible arm and support segment within the Skn domain in DNA interaction.

Main Methods:

  • Structural analysis of the Skn domain.
  • Investigation of protein-DNA interactions using biophysical techniques (implied).

Related Experiment Videos

  • Comparative analysis with bZIP protein DNA-binding mechanisms.

    • Main Results:

    • The Skn domain possesses a flexible arm and a support segment that stabilize monomeric DNA binding.
    • Off DNA, the support segment forms a molten globule structure of four alpha-helices.
    • On DNA, the basic region extends from a crucial alpha-helix within the support segment, anchoring the domain in the major groove.

    Conclusions:

    • The Skn domain utilizes a unique structural strategy involving a support segment for stable monomeric DNA binding.
    • Conserved mechanisms, such as helix extension and cooperative stability, are employed by SKN-1 and bZIP proteins to facilitate basic region DNA binding.
    • This study provides insights into the structural adaptations enabling SKN-1's function in early *C. elegans* development.