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Related Experiment Videos

Desmin-containing intermediate filaments: structural analysis using monoclonal antibodies.

M J Allen1, P Johnson

  • 1Department of Chemistry, Ohio University, Athens 45701.

The International Journal of Biochemistry
|January 1, 1989
PubMed
Summary

Researchers developed monoclonal antibodies targeting desmin filaments. These antibodies revealed a helical structure and supported a staggered assembly model for desmin intermediate filaments.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Structural Biology

Background:

  • Desmin is a crucial intermediate filament protein in muscle cells.
  • Understanding desmin assembly is vital for muscle development and disease research.

Purpose of the Study:

  • To generate antibodies against specific desmin regions.
  • To investigate the structural organization of desmin intermediate filaments.
  • To elucidate the model of desmin filament assembly.

Main Methods:

  • Raising monoclonal antibodies against N- and C-terminal desmin sequences.
  • Immunofluorescence microscopy to visualize antibody binding to desmin filaments.
  • Consecutive antibody labeling experiments.

Main Results:

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  • Monoclonal antibodies specifically decorated desmin intermediate filaments in a helical pattern.
  • Four antibody molecules were observed per turn of the helix.
  • Both N- and C-terminal antibodies could label the filaments consecutively, indicating accessible epitopes along the filament structure.
  • The helical decoration pattern and consecutive labeling support a staggered, overlapping alignment of protofilaments.

Conclusions:

  • The study provides strong evidence for a specific helical arrangement of desmin intermediate filaments.
  • The findings support a model where tetrameric protofilaments align in a staggered, partially overlapping manner.
  • This research advances the understanding of intermediate filament structure and assembly mechanisms.