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The interaction between fibronectin and DNA.

A Siddiqa1, S R Ayad, P Dickinson

  • 1Department of Biochemistry and Molecular Biology, School of Biological Sciences, Medical School, University of Manchester, U.K.

Anticancer Research
|March 1, 1989
PubMed
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Bovine plasma fibronectin has a single DNA binding domain. This protein preferentially binds to eukaryotic DNA promoter regions, suggesting a regulatory role in its own gene.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Fibronectin (Fn) is an extracellular matrix protein involved in various cellular processes.
  • The DNA-binding properties of fibronectin are not fully understood.
  • Investigating fibronectin's DNA interaction can reveal novel regulatory mechanisms.

Purpose of the Study:

  • To elucidate the DNA binding domain structure of bovine plasma fibronectin.
  • To determine the nature and specificity of fibronectin-DNA interactions.
  • To explore the potential regulatory function of fibronectin binding to its own gene.

Main Methods:

  • Limited proteolytic cleavage and Western blotting to identify DNA binding fragments.
  • Time-course digestion with cathepsin D to analyze fragment sizes.

Related Experiment Videos

  • Dot blotting with labeled DNA (chicken fibronectin gene fragments, lambda DNA) to assess binding specificity.
  • Heat denaturation to investigate the ionic nature of the interaction.

    • Main Results:

    • A single DNA binding domain of approximately 18 kDa was identified in fibronectin.
    • Fibronectin-DNA interaction is not ionic, as heat denaturation abolished binding.
    • Fibronectin showed preferential binding to eukaryotic DNA (chicken fibronectin gene promoter region) over prokaryotic DNA (lambda DNA).
    • Binding was significantly higher to a promoter-containing fragment compared to a non-promoter fragment of the chicken fibronectin gene.

    Conclusions:

    • Bovine plasma fibronectin possesses a distinct DNA binding domain.
    • Fibronectin exhibits sequence-specific DNA binding, favoring eukaryotic promoter regions.
    • These findings suggest a potential role for fibronectin in regulating its own gene expression.