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Related Experiment Videos

Structural studies on Pax-8 Prd domain/DNA complex.

M Campagnolo1, A Pesaresi, I Zelezetsky

  • 1Department of Chemical Sciences and Centre of Excellence in Biocrystallography, University of Trieste, Via L. Giorgieri 1, 34127 Trieste, Italy.

Journal of Biomolecular Structure & Dynamics
|February 23, 2007
PubMed
Summary
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Researchers analyzed the Pax-8 paired domain

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Pax-8 is a crucial transcription factor for thyroid follicular cell development.
  • It possesses paired and homeo DNA-binding domains.

Purpose of the Study:

  • To perform preliminary X-ray diffraction analysis of the mammalian Pax-8 paired domain.
  • To investigate its complex with the C-site of the thyroglobulin promoter.

Main Methods:

  • Crystallization of the Pax-8 paired domain with blunt-ended and sticky-ended DNA fragments using hanging-drop vapor diffusion.
  • X-ray diffraction analysis using synchrotron radiation.
  • Fluorescence experiments to assess protein-DNA sample homogeneity.

Main Results:

Related Experiment Videos

  • Crystals of Pax-8 complexed with DNA diffracted to 6.0 and 8.0 A resolution.
  • Crystallization was influenced by ionic strength, yielding transparent, large crystals.
  • Crystalline disorder was linked to low protein-DNA sample homogeneity.

Conclusions:

  • The study provides preliminary structural insights into the Pax-8 paired domain-DNA interaction.
  • Theoretical modeling suggests conserved protein-DNA interactions and a role for cysteine residues in redox control of DNA recognition.