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Related Experiment Videos

Crystallographic characterization of a PHO4-DNA complex

T Hakoshima1, Y Teranishi, T Ohira

  • 1Faculty of Pharmaceutical Sciences, Osaka University, Japan.

Journal of Molecular Biology
|January 20, 1993
PubMed
Summary

Researchers crystallized the DNA-binding domain of yeast transcription factor PHO4 with DNA. This structural study provides insights into DNA-protein interactions and gene regulation mechanisms.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • Transcription factors regulate gene expression by binding to specific DNA sequences.
  • The yeast transcription factor PHO4 plays a crucial role in regulating genes involved in phosphate metabolism.
  • Understanding the structural basis of DNA-protein interactions is essential for deciphering gene regulation.

Purpose of the Study:

  • To obtain crystals of the DNA-binding domain of yeast transcription factor PHO4 in complex with cognate DNA sequences.
  • To facilitate X-ray diffraction studies for structural determination.
  • To provide insights into the molecular mechanisms of PHO4-DNA recognition.

Main Methods:

  • Complex formation between the DNA-binding domain of PHO4 and synthetic DNA fragments.

Related Experiment Videos

  • Crystallization using polyethylene glycol and calcium chloride solutions.
  • X-ray diffraction data collection using synchrotron radiation and a Weissenberg camera.

    • Main Results:

    • Crystals of the PHO4 DNA-binding domain complexed with a 17 base-pair DNA fragment were successfully obtained.
    • The crystals exhibit space groups P4(1)2(1)2 or P4(3)2(1)2 with specific unit cell dimensions.
    • Diffraction data were collected to 3 A resolution.

    Conclusions:

    • The successful crystallization and diffraction data collection enable the structural elucidation of the PHO4-DNA complex.
    • This structural information will enhance our understanding of transcription factor-DNA binding specificity.
    • The findings contribute to the broader knowledge of gene regulation in yeast.