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Related Experiment Videos

A protein-DNA binding mechanism proceeds through multi-state or two-state parallel pathways.

Diego U Ferreiro1, Gonzalo de Prat-Gay

  • 1Instituto Leloir, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and CONICET. Patricias Argentinas 435, (1405), Buenos Aires, Argentina.

Journal of Molecular Biology
|July 24, 2003
PubMed
Summary

The papillomavirus E2 protein

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • Papillomavirus E2 protein's C-terminal domain is crucial for DNA binding.
  • Understanding its DNA-binding mechanism is key to viral replication control.

Purpose of the Study:

  • To elucidate the detailed DNA-binding mechanism of the dimeric papillomavirus E2 protein C-terminal domain.
  • To identify intermediate steps and energetic contributions in protein-DNA complex formation.

Main Methods:

  • Utilized double-jump stopped-flow experiments.
  • Investigated sequential multi-step reaction kinetics and conformational changes.
  • Analyzed solvent exclusion and surface area burial at the protein-DNA interface.

Main Results:

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  • Identified two parallel pathways for DNA binding.
  • Demonstrated initial non-specific encounter complex formation followed by conformational rearrangement.
  • Characterized a late-stage solvent exclusion step crucial for direct base readout and complex consolidation.

Conclusions:

  • The papillomavirus E2 protein utilizes parallel pathways for DNA binding, involving initial non-specific interactions followed by specific recognition.
  • A multi-step mechanism includes conformational changes and solvent exclusion, leading to stable complex formation and DNA base readout.