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Related Experiment Videos

DnaA protein/DNA interaction. Modulation of the recognition sequence.

C Schaefer1, W Messer

  • 1Max-Planck-Institut für molekulare Genetik, Abt. Trautner, Berlin, Federal Republic of Germany.

Molecular & General Genetics : MGG
|April 1, 1991
PubMed
Summary
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Researchers studied DNA replication initiation by analyzing DnaA protein binding to dnaA boxes. They found specific dnaA box sequences in oriC have the highest affinity, leading to a refined consensus sequence for DnaA protein binding.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The DnaA protein is crucial for initiating DNA replication in bacteria.
  • DnaA protein binds to specific DNA sequences called dnaA boxes, primarily within the origin of replication (oriC).
  • The binding affinity of DnaA to dnaA boxes influences the regulation of DNA replication initiation.

Purpose of the Study:

  • To investigate the in vivo binding affinities of various dnaA boxes to the DnaA protein.
  • To determine the functional significance of different dnaA box sequences in regulating transcription termination.
  • To derive a new, more accurate consensus sequence for dnaA boxes based on their binding properties.

Main Methods:

  • Assessing DnaA protein/dnaA box complex interactions by monitoring transcription termination.

Related Experiment Videos

  • Quantifying DnaA protein binding affinities in vivo using different dnaA box sequences.
  • Measuring the rate of transcription distal to dnaA boxes via reporter gene (galK) expression.
  • Mutating a known dnaA box sequence at eight positions to create variants with altered properties.

    • Main Results:

    • The dnaA boxes 5'-TTATACACA and 5'-TTATCCAAA, located in oriC, exhibited the strongest binding affinity for the DnaA protein.
    • The study identified varying affinities of different dnaA boxes to the DnaA protein.
    • Mutational analysis of the 5'-TTTTCCACA dnaA box provided insights into sequence-dependent binding.

    Conclusions:

    • The binding affinity of dnaA boxes to the DnaA protein is sequence-dependent and can be quantified in vivo.
    • Specific dnaA box sequences within oriC are critical for high-affinity DnaA binding.
    • A refined consensus sequence, 5'-(T/C)(T/C)(A/T/C)T(A/C)C(A/G)(A/C/T(A/C), better represents the functional dnaA box sequences crucial for DNA replication initiation.