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Structural Analysis of Different LINC Complexes Reveals Distinct Binding Modes.

Victor E Cruz1, F Esra Demircioglu1, Thomas U Schwartz1

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.

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|October 15, 2020
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Summary

Linker of nucleoskeleton and cytoskeleton (LINC) complexes connect the nucleus to the cytoskeleton. Structural analysis reveals distinct binding modes and conformations in SUN-KASH interactions, crucial for regulating the LINC network.

Keywords:
KASH proteinsSUN proteinsmechanotransductionnuclear envelopenucleo-cytoplasmic communication

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Area of Science:

  • Cell Biology
  • Structural Biology
  • Biochemistry

Background:

  • Linker of nucleoskeleton and cytoskeleton (LINC) complexes physically connect the nucleus to the cytoskeleton across the nuclear envelope.
  • LINC complexes are essential for mechanical force transmission during nuclear anchorage, migration, and meiotic chromosome pairing.
  • These complexes comprise KASH proteins (outer nuclear membrane) and SUN proteins (inner nuclear membrane), but their specific engagement mechanisms are unclear.

Purpose of the Study:

  • To investigate the molecular basis governing the engagement between SUN and KASH proteins within LINC complexes.
  • To elucidate the structural diversity of SUN-KASH interactions using high-resolution crystallography.

Main Methods:

  • High-resolution crystal structure determination of human SUN2 in complex with KASH-peptides from Nesprin3, Nesprin4, and KASH5.
  • Comparative structural analysis with previously determined SUN2-KASH1/2 complexes.

Main Results:

  • Observed distinct binding modes and at least two different conformations for the extended KASH-peptides.
  • Identified conserved core interactions between SUN proteins and KASH C-terminal residues.
  • Detailed analysis of critical interaction elements like the KASH-lid and cation loop, and a potential self-locked state for unbound SUN.

Conclusions:

  • Significant structural differences exist among various SUN-KASH complexes.
  • These variations likely play a key role in regulating the overall SUN-KASH network and LINC complex function.