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Production, Crystallization, and Structure Determination of the IKK-binding Domain of NEMO
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Nebulin binding impedes mutant desmin filament assembly.

Laura K Baker1, David C Gillis, Sarika Sharma

  • 1Department of Veterinary Pathobiology, Texas A&M University, College Station, TX 77843-4467, USA.

Molecular Biology of the Cell
|April 26, 2013
PubMed
Summary
This summary is machine-generated.

Nebulin binding to desmin (DIFs) impacts muscle cell organization. Mutant desmin variants show delayed assembly and altered nebulin binding, potentially explaining desminopathy causes.

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Area of Science:

  • Muscle biology
  • Cellular biophysics
  • Protein interactions

Background:

  • Desmin intermediate filaments (DIFs) are crucial for myofiber organization in striated muscle.
  • The precise mechanisms of desmin assembly, sarcomere association, and their link to desminopathy remain unclear.

Purpose of the Study:

  • To investigate how nebulin binding affects the assembly kinetics of wild-type desmin and three desminopathy-associated mutants (S46F, E245D, T453I).
  • To explore the role of nebulin-desmin interactions in the molecular etiology of desminopathy.

Main Methods:

  • In vitro assembly kinetics assays of desmin and its mutants with nebulin.
  • Electron microscopy to visualize nebulin-desmin filament associations.
  • Live-cell imaging using fluorescence recovery after photobleaching (FRAP) to assess desmin dynamics.

Main Results:

  • Nebulin bound to both tetrameric desmin and mature filaments.
  • All three desmin mutants exhibited significantly delayed filament assembly kinetics when bound to nebulin.
  • Mutant desmin variants showed enhanced binding affinity and capacity for nebulin compared to wild-type desmin.
  • FRAP experiments revealed delayed dynamics for mutant desmin E245D in live cells.

Conclusions:

  • Nebulin binding to desmin mutants alters filament assembly and dynamics.
  • Mutant desmin may slow down desmin remodeling by retaining nebulin near Z-discs.
  • Deficiencies in nebulin-desmin association contribute to the molecular basis of desminopathy for certain mutants.