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DNA binding proteins explore multiple local configurations during docking via rapid rebinding.

Mahipal Ganji1, Margreet Docter1, Stuart F J Le Grice2

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Protein flipping, a key DNA-binding mechanism, is more efficient with stronger protein-DNA interactions. This study reveals that proteins explore configurations via rapid re-binding events, not full dissociation.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Structural Biology

Background:

  • DNA-binding proteins must efficiently locate and bind target sites.
  • Protein flipping allows exploration of local configurations but its mechanism is unclear.
  • HIV-1 reverse transcriptase (RT) serves as a model for studying protein flipping.

Purpose of the Study:

  • To elucidate the mechanism of protein flipping at the single-molecule level.
  • To investigate the influence of salt concentration and macromolecular crowding on flipping efficiency.
  • To understand how protein-DNA binding strength affects flipping dynamics.

Main Methods:

  • Single-molecule experiments using HIV-1 reverse transcriptase (RT).
  • Manipulation of salt concentration to alter protein-DNA binding affinity.
  • Macromolecular crowding to modulate binding interactions.
  • Analysis of flipping kinetics, including rate and probability.

Main Results:

  • Increased salt concentration weakened RT-DNA binding.
  • Increased macromolecular crowding strengthened RT-DNA binding.
  • Protein flipping efficiency correlated positively with RT-DNA binding strength.

Conclusions:

  • Protein flipping is more efficient when protein-DNA binding is stronger.
  • The findings support a model of rapid re-binding events ('short hops') for configuration exploration.
  • This mechanism allows proteins to explore DNA configurations without complete dissociation.