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Updated: Jan 27, 2026

Single-Molecule Imaging of Nuclear Transport

Single-Molecule Imaging of Nuclear Transport

Published on: June 9, 2010

SUN/KASH interactions facilitate force transmission across the nuclear envelope.

Hongyan Hao¹, Daniel A Starr¹

¹a Department of Molecular and Cellular Biology , University of California , Davis , CA USA.

Nucleus (Austin, Tex.)

|March 20, 2019

Summary

Linker of Nucleoskeleton and Cytoskeleton (LINC) complexes are crucial for nuclear positioning and cell migration. Specific KASH protein residues and disulfide bonds are vital for transmitting forces across the nuclear envelope.

Keywords:

LINC complex mechanical force transduction nuclear envelope nuclear positioning

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Area of Science:

Cell Biology
Biophysics
Structural Biology

Background:

The Linker of Nucleoskeleton and Cytoskeleton (LINC) complex connects the nucleus to the cytoskeleton.
LINC complexes are essential for nuclear positioning, cell migration, and chromosome dynamics.

Purpose of the Study:

To investigate the in vivo functions of conserved interfaces within LINC complexes.
To elucidate the role of specific SUN-KASH protein interactions in force transmission.

Main Methods:

Utilized Caenorhabditis elegans genetics.
Performed imaging in cultured NIH 3T3 fibroblasts.
Employed Molecular Dynamic simulations to study SUN-KASH interactions.

Main Results:

Identified conserved aromatic residues at the -7 position of KASH protein C-termini as important for force transmission.
Demonstrated the critical role of conserved disulfide bonds in LINC complexes for mechanical force transmission.
Suggested that helices preceding the SUN domain and longer coiled-coils contribute to force transmission across the nuclear envelope.

Conclusions:

Specific molecular interactions within LINC complexes are essential for transmitting mechanical forces.
Conserved structural features of LINC complexes facilitate cytoskeleton-nucleus communication.
Further research into LINC complex organization can reveal mechanisms of force transmission.