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Updated: Jun 23, 2025

An Optimized Protocol for Electrophoretic Mobility Shift Assay Using Infrared Fluorescent Dye-labeled Oligonucleotides
Published on: November 29, 2016
Probing the modulation in facilitated diffusion guided by DNA-protein interactions in target search processes.
Diljith Thonnekottu1, Debarati Chatterjee2,1
1Department of Physics, Indian Institute of Technology Palakkad, Kerala 678623, India.
Facilitated diffusion, a mix of 1D sliding and 3D movement, speeds up how proteins find DNA sequences. This study quantizes search dynamics, revealing DNA flexibility and target location impact protein search efficiency.
Area of Science:
- Biophysics
- Molecular Biology
- Genetics
Background:
- Gene regulation and editing depend on proteins locating specific DNA sequences.
- Facilitated diffusion, combining 1D sliding and 3D movement, is crucial for rapid target searching by proteins.
Purpose of the Study:
- To investigate how DNA properties and target location affect protein search dynamics.
- To quantify the rate and statistics of target search processes using first passage time (FPT) calculations.
Main Methods:
- Utilized Brownian dynamics simulations with a coarse-grained model of a diffusing protein on DNA.
- Employed first passage time (FPT) calculations to analyze search dynamics.
Main Results:
- Characterized the influence of DNA rigidity/flexibility and target position on protein search efficiency.
- Highlighted the significant role of DNA chain dynamics in facilitated diffusion mechanisms.
Conclusions:
- Theoretical analysis provides insights into the complex mechanisms of facilitated diffusion.
- Understanding these dynamics is key for gene regulation and editing technologies.
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