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Related Experiment Video

Updated: Jul 19, 2025

Proteome-wide Quantification of Labeling Homogeneity at the Single Molecule Level
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Published on: April 19, 2019

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Quantification of macromolecule crowding at single-molecule level.

Ting Liang1, Chao Yang1, Xiaoya Song1

  • 1College of Physics, Guizhou University, Guiyang 550025, China.

Physical Review. E
|August 16, 2023
PubMed
Summary
This summary is machine-generated.

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Macromolecule crowding influences cellular processes. Researchers used magnetic tweezers and a DNA model to show polyethylene glycol (PEG) interactions with DNA hairpins are primarily due to excluded volume effects.

Area of Science:

  • Biophysics
  • Molecular Biology
  • Biochemistry

Background:

  • Macromolecule crowding significantly impacts cellular biochemical processes.
  • Excluded volume effects are expected to promote macromolecular complexation, but this conflicts with recent findings on synthetic polymer-nucleic acid interactions.

Purpose of the Study:

  • To resolve discrepancies in understanding macromolecule crowding effects on nucleic acids.
  • To systematically study the kinetics and thermodynamics of DNA hairpin folding in a crowded environment.

Main Methods:

  • High-resolution magnetic tweezers were combined with an extended crowder-oxDNA model.
  • The interaction between crowders (polyethylene glycol) and a DNA hairpin was investigated.

Main Results:

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  • A linear dependence of DNA hairpin critical force on polyethylene glycol (PEG) concentration was observed.
  • Results align with the crowder-oxDNA model, indicating excluded volume effects dominate PEG-DNA hairpin interactions, unlike dextran interactions.
  • The folding rate dependence on PEG molecular weight differed from previous fluorescence resonance energy transfer studies.

Conclusions:

  • Excluded volume effects are the primary drivers of polyethylene glycol interactions with DNA hairpins.
  • The study provides a method to detect inert synthetic molecule-DNA hairpin interactions for mimicking cellular environments.