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Structural basis for lamin assembly at the molecular level.

Jinsook Ahn1, Inseong Jo1, So-Mi Kang2

  • 1Department of Agricultural Biotechnology, Center for Food Safety and Toxicology, Center for Food and Bioconvergence, and Research Institute for Agriculture and Life Sciences, CALS, Seoul National University, Seoul, 08826, Korea.

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|August 23, 2019
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Nuclear lamins, essential for nuclear structure, have poorly understood assembly mechanisms. This study reveals their molecular assembly through high-resolution structures and cross-linking, clarifying their function and potential disease links.

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Area of Science:

  • Cell Biology
  • Structural Biology
  • Biochemistry

Background:

  • Nuclear lamins are intermediate filaments crucial for nuclear structure and function.
  • Existing lamin assembly models lack molecular-level detail.
  • Understanding lamin assembly is key to deciphering nuclear organization and related diseases.

Purpose of the Study:

  • To elucidate the molecular mechanism of lamin assembly.
  • To provide high-resolution structural insights into lamin interactions.
  • To establish a molecular basis for lamin assembly applicable to other intermediate filaments.

Main Methods:

  • X-ray crystallography of a human lamin fragment at 3.2 Å resolution.
  • Chemical cross-linking coupled with mass spectrometry (MS) analysis.
  • Structural analysis to determine dimer arrangement and interactions.

Main Results:

  • The crystal structure reveals an anti-parallel arrangement of two coiled-coil dimers.
  • Chemical cross-linking and MS identified interactions between lamin dimers.
  • A molecular mechanism for lamin assembly was proposed based on structural and interaction data.

Conclusions:

  • The proposed mechanism explains lamin assembly and is consistent with native state models.
  • Findings provide insights into pathological mutations affecting lamin function.
  • The study offers a molecular foundation for understanding intermediate filament assembly.