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Related Experiment Videos

Detection and purification of sequence-specific DNA binding protein

K C Majumdar1, S Shetty, R Wadhwa

  • 1Centre for Cellular and Molecular Biology, Hyderabad, India.

Analytical Biochemistry
|October 1, 1996
PubMed
Summary

A new slot-blot assay identifies DNA-binding proteins. This method, combined with DNA affinity chromatography, enables rapid purification of sequence-specific DNA-binding proteins like Bkm-binding protein (BBP).

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Identifying and purifying DNA-binding proteins is crucial for understanding gene regulation.
  • Sequence-specific DNA-binding proteins play key roles in various biological processes.
  • Existing methods can be time-consuming and complex.

Purpose of the Study:

  • To develop a simple and rapid assay for identifying DNA-binding proteins.
  • To establish an efficient purification scheme for sequence-specific DNA-binding proteins.
  • To characterize the Bkm-binding protein (BBP) which binds GATA repeats.

Main Methods:

  • Slot-blot apparatus used for loading protein fractions onto a nitrocellulose membrane.
  • Incubation with a 32P-labeled DNA probe and excess non-specific DNA.

Related Experiment Videos

  • Washing with increasing NaCl concentrations to optimize signal and purification via DNA affinity column using GATA repeats.

    • Main Results:

    • A straightforward slot-blot binding assay was established for identifying DNA-binding proteins.
    • A rapid purification protocol was developed using ammonium sulfate precipitation and a GATA repeat DNA-Sepharose affinity column.
    • Successful purification of the sex and tissue-specific Bkm-binding protein (BBP) was achieved.

    Conclusions:

    • The described slot-blot assay is effective for screening DNA-binding proteins.
    • The purification scheme is efficient for isolating sequence-specific DNA-binding proteins.
    • These methods facilitate routine screening and purification of DNA-binding proteins in molecular biology research.