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Structure-specific binding of the proto-oncogene protein DEK to DNA

Tanja Waldmann1, Martina Baack, Nicole Richter

  • 1University of Konstanz, Department of Biology, D-78457 Konstanz, Germany.

Nucleic Acids Research
|November 25, 2003
PubMed

Insights

The DEK protein binds DNA, preferring supercoiled structures and DNA junctions. This protein influences DNA topology and aids in DNA molecule interactions, classifying it as an architectural protein.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • The DEK protein is a proto-oncogene.
  • DEK is associated with chromatin throughout the cell cycle.
  • DEK influences DNA topology by introducing positive supercoils.

Purpose of the Study:

  • To investigate the sequence and structure specificities of DEK-DNA interactions.
  • To characterize the DNA-binding preferences of the DEK protein.
  • To understand DEK's role in DNA topology and intermolecular DNA reactions.

Main Methods:

  • DNA supercoiling assays.
  • DNA binding studies with supercoiled DNA and four-way junctions.
  • Enzyme assays measuring DEK's effect on topoisomerase II and DNA ligase activity.

Main Results:

  • DEK binding to DNA is not sequence-specific.
  • DEK shows a preference for supercoiled DNA and four-way junction DNA.
  • DEK stimulates intermolecular DNA catenation and ligation in the presence of relevant enzymes.

Conclusions:

  • DEK functions as a DNA architectural protein.
  • DEK's DNA binding properties are crucial for its cellular functions.
  • DEK plays a role in organizing and manipulating DNA structure.

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