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Atomic force microscopy of the myosin molecule

P Hallett1, G Offer, M J Miles

  • 1H. H. Wills Physics Laboratory, University of Bristol, United Kingdom.

Biophysical Journal
|April 1, 1995
PubMed
Summary

Atomic force microscopy (AFM) visualized rabbit skeletal muscle myosin structure. The glycerol-mica technique effectively prepares fibrous proteins for scanning probe microscopy analysis.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Molecular Motors

Background:

  • Myosin is a crucial protein for muscle contraction.
  • Understanding myosin's structure is key to muscle function.
  • Previous structural studies often relied on electron microscopy.

Purpose of the Study:

  • To investigate the structure of rabbit skeletal muscle myosin.
  • To evaluate the glycerol-mica technique for protein preparation.
  • To utilize atomic force microscopy (AFM) for high-resolution imaging.

Main Methods:

  • Rabbit skeletal muscle myosin was deposited onto mica from glycerol solution.
  • Contact mode AFM was employed with the sample immersed in propanol.
  • Imaging and force application were used to analyze molecular structure.

Main Results:

  • Myosin molecules displayed a characteristic two-headed structure with a long tail.
  • The average tail length measured 155 +/- 5 nm, consistent with prior research.
  • Applied force allowed for local separation of the alpha-helical coiled-coil tail strands.

Conclusions:

  • The glycerol-mica technique is suitable for preparing fibrous proteins for scanning probe microscopy.
  • AFM provides valuable insights into myosin's molecular architecture.
  • The study confirms and refines structural observations of myosin previously made with electron microscopy.

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