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Related Experiment Videos

Changes in myosin structure and function in response to glycation.

B Ramamurthy1, P Höök, A D Jones

  • 1Noll Physiological Research Center, University Park, Pennsylvania 16802, USA.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|November 2, 2001
PubMed
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Nonenzymatic glycosylation (glycation) alters skeletal muscle myosin structure and function. This protein modification reduces myosin

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Physiology

Background:

  • Nonenzymatic glycosylation (glycation) is a crucial post-translational modification impacting extracellular protein structure and function.
  • The glycation effects on intracellular proteins, like skeletal muscle myosin, remain less understood despite their vital roles.

Purpose of the Study:

  • To investigate the impact of glycation on the structural and functional properties of skeletal muscle myosin.
  • To elucidate the mechanisms by which glycation affects myosin mechanics.

Main Methods:

  • Skeletal muscle myosin was incubated with glucose.
  • Structural modifications were analyzed using MALDI mass spectrometry.
  • Functional changes were assessed via a single-fiber in vitro motility assay.

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Main Results:

  • Glycation induced structural alterations in myosin, including cross-linking and loss of specific proteolysis products.
  • A significant reduction in in vitro motility speed was observed post-glycation.
  • Motility speed was fully restored by hydroxylamine hydrochloride, indicating reversible Schiff base formation.

Conclusions:

  • Glycation significantly impacts both the structure and function of skeletal muscle myosin.
  • These findings offer insights into muscle function impairment in aging and diabetes.