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Related Experiment Videos

Molecular tools to elucidate problems in excitation-contraction coupling.

D H MacLennan1

  • 1Banting and Best Department of Medical Research, Charles H. Best Institute, University of Toronto, Ontario, Canada.

Biophysical Journal
|December 1, 1990
PubMed
Summary

Molecular genetics revealed insights into calcium transport by Ca2(+)-ATPase and identified the RYR1 gene linked to malignant hyperthermia, a neuromuscular disorder.

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ATP binding residues of sarcoplasmic reticulum Ca2+-ATPase.

Annals of the New York Academy of Sciences·2003
Same author

Ryanodine sensitizes the cardiac Ca(2+) release channel (ryanodine receptor isoform 2) to Ca(2+) activation and dissociates as the channel is closed by Ca(2+) depletion.

Proceedings of the National Academy of Sciences of the United States of America·2001
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Mutations to Gly2370, Gly2373 or Gly2375 in malignant hyperthermia domain 2 decrease caffeine and cresol sensitivity of the rabbit skeletal-muscle Ca2+-release channel (ryanodine receptor isoform 1).

The Biochemical journal·2001
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Phospholamban domain IB forms an interaction site with the loop between transmembrane helices M6 and M7 of sarco(endo)plasmic reticulum Ca2+ ATPases.

Proceedings of the National Academy of Sciences of the United States of America·2001
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Functional characterization of mutants in the predicted pore region of the rabbit cardiac muscle Ca(2+) release channel (ryanodine receptor isoform 2).

The Journal of biological chemistry·2001
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Superinhibition of sarcoplasmic reticulum function by phospholamban induces cardiac contractile failure.

The Journal of biological chemistry·2001

Area of Science:

  • Biophysics
  • Molecular Genetics
  • Biochemistry

Background:

  • Sarcoplasmic reticulum proteins are crucial for muscle function.
  • Understanding their mechanisms is key to addressing neuromuscular diseases.
  • Molecular genetic techniques offer powerful tools for biological dissection.

Purpose of the Study:

  • To review the application of molecular genetics in studying sarcoplasmic reticulum proteins.
  • To elucidate the mechanism of Ca2+ transport by Ca2(+)-ATPase.
  • To identify genetic factors predisposing to malignant hyperthermia.

Main Methods:

  • Site-directed mutagenesis was employed to investigate the Ca2(+)-ATPase mechanism.
  • Cloning and genetic linkage analysis were used to identify the Ca2+ release channel (RYR1) gene.

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  • Research focused on understanding the predisposition to malignant hyperthermia.

    • Main Results:

    • Site-directed mutagenesis provided insights into Ca2+ transport mechanisms.
    • The RYR1 gene was identified as a candidate gene for malignant hyperthermia predisposition.
    • This research bridges molecular mechanisms with disease predisposition.

    Conclusions:

    • Molecular genetic approaches are effective for dissecting complex biological problems.
    • Understanding sarcoplasmic reticulum protein function is vital for neuromuscular disease research.
    • The RYR1 gene is implicated in the pathogenesis of malignant hyperthermia.