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mRNA Interactome Capture from Plant Protoplasts

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Protein--DNA interactions: reaching and recognizing the targets.

A G Cherstvy¹, A B Kolomeisky, A A Kornyshev

¹Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Strasse 38, D-01187 Dresden, Germany. a.cherstvy@fz-juelich.de

The Journal of Physical Chemistry. B

|March 25, 2008

Summary

Protein target search on DNA is faster than predicted due to a combination of 3D/1D motion and parallel scanning. Electrostatic interactions guide specific DNA sequence recognition and protein binding.

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Area of Science:

Molecular Biology
Biophysics
Biochemistry

Background:

Proteins binding to DNA targets often exhibit search speeds exceeding predictions based on 3D diffusion alone.
Recent single-molecule experiments indicate slow protein diffusion along DNA, creating a discrepancy with observed search efficiencies.

Purpose of the Study:

To investigate the physical-chemical mechanisms underlying protein target search and recognition on DNA.
To reconcile the observed rapid search times with experimental diffusion data.

Main Methods:

Developed a theoretical model analyzing the protein search process as sequential 3D and 1D diffusion cycles.
Incorporated protein-DNA binding energy and electrostatic interactions into the search model.
Derived analytical expressions for protein-DNA interaction potential wells.

Main Results:

Search time is influenced by 3D motion, 1D motion, and a correlation term.
Accelerated search occurs at intermediate protein-DNA binding energies, partly due to parallel scanning by multiple proteins.
Electrostatic complementarity between protein and DNA charge patterns facilitates specific target recognition and binding.

Conclusions:

The theoretical model explains the enhanced speed of protein-DNA target recognition.
Protein-DNA binding energy and electrostatic forces play crucial roles in efficient target localization.
The concept of a 'capturing well' provides a framework for understanding protein-DNA interactions and binding durations.