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Related Experiment Videos

Determining the DNA sequence elements required for binding integration host factor to two different target sites

L M Hales1, R I Gumport, J F Gardner

  • 1Department of Microbiology, University of Illinois, Urbana 61801.

Journal of Bacteriology
|May 1, 1994
PubMed
Summary
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Integration host factor (IHF) binding requires both a core consensus sequence and a dA+dT-rich element for some sites. The core sequence alone suffices for other sites, but the dA+dT-rich element enhances binding affinity.

Area of Science:

  • Molecular Biology
  • Genetics
  • Microbiology

Background:

  • Escherichia coli integration host factor (IHF) is a DNA-binding protein crucial for various genetic processes.
  • IHF binding sites are characterized by a consensus sequence (WATCAANNNNTTR) and often include a 5'-proximal dA+dT-rich region.
  • The relative importance of these two sequence elements for IHF binding is not fully understood.

Purpose of the Study:

  • To investigate the functional significance of the core consensus sequence and the dA+dT-rich element in IHF binding.
  • To determine the specific requirements for IHF binding at the H' and H1 sites within the attP region of bacteriophage lambda.
  • To elucidate how these sequence elements contribute to IHF's role in gene regulation.

Main Methods:

  • Utilized the bacteriophage P22-based challenge-phage system to assay IHF binding and function.

Related Experiment Videos

  • Constructed and analyzed mutants of the H' and H1 binding sites to assess the impact of sequence variations.
  • Isolated and sequenced mutants with altered IHF binding to identify critical bases within the consensus element.

    • Main Results:

    • IHF binding to the H' site requires both the core consensus and the dA+dT-rich element; the absence of the latter prevents IHF's repressor function.
    • The core consensus sequence alone is sufficient for IHF binding to the H1 site, which naturally lacks the upstream dA+dT-rich region.
    • Mutational analysis confirmed that changes within the core consensus element are primarily responsible for altered IHF binding to the H1 site.
    • The addition of a dA+dT-rich element upstream of the H1 core consensus significantly enhanced IHF binding affinity.

    Conclusions:

    • Both the core consensus sequence and the upstream dA+dT-rich element play distinct roles in IHF binding specificity and affinity.
    • The H' site requires both elements for functional IHF binding, highlighting context-dependent requirements.
    • The H1 site demonstrates that the core consensus is sufficient, but the dA+dT-rich region acts as an enhancer, increasing binding affinity.