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Related Concept Videos

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Electricity is generated by either electrons or ions flowing through a solution or a conducting medium. This flow of electrons or specifically electrical charge is defined as an electric current. When electrons move through a wire, they generate an electric current. It can be recalled  that in a redox reaction, electrons are lost and gained. In the spontaneous redox reaction of zinc  with copper, when zinc is immersed in a copper ion solution, a transfer of electrons from one substance to...
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Probing The Structure And Dynamics Of Nucleosomes Using Atomic Force Microscopy Imaging
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Force-dependent structural dynamics of the giant nesprin-2.

Fei Shang1,2,3, Yuhang Zhang1,2,3, Jiaqing Ye1,2,3

  • 1Department of Physics, College of Physical Science and Technology, State Key Laboratory for Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361005, China.

Proceedings of the National Academy of Sciences of the United States of America
|January 23, 2026
PubMed
Summary

Nesprin-2 giant acts as a molecular absorber, maintaining forces on cell structures. Its spectrin repeat domains unfold and refold under pN forces, regulating cell mechanics and protein interactions.

Keywords:
forcemechanobiologynesprinssingle-molecule manipulationspectrin repeats

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Area of Science:

  • Cell Biology
  • Biophysics
  • Structural Biology

Background:

  • Nesprins link the cytoskeleton to the nucleus, experiencing physiological forces.
  • The mechanical dynamics of nesprins under force are not well understood.

Purpose of the Study:

  • To investigate the force dynamics of spectrin repeat (SR) domains in giant nesprin-2.
  • To explore nesprin-2's role in nucleoskeleton-cytoskeleton mechanotransduction.

Main Methods:

  • Magnetic tweezers-based single-molecule manipulation.
  • Molecular dynamics simulations.
  • AlphaFold structural predictions.

Main Results:

  • Nesprin-2's SR domains exhibit distinct unfolding and refolding dynamics at the pN scale.
  • Nesprin-2 functions as a molecular absorber, stabilizing forces within a few pN over large displacements.
  • pN-level forces modulate nesprin-protein interactions through domain dynamics.

Conclusions:

  • Giant nesprin-2 possesses significant mechanical characteristics crucial for cellular force transmission.
  • Understanding nesprin-2's mechanical properties provides insight into mechanotransduction pathways.