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The structure, function, and cellular regulation of ryanodine-sensitive Ca2+ release channels
V Shoshan-Barmatz1, R H Ashley
1Department of Life Sciences, Ben-Gurion University, Beer-Sheva, Israel.
International Review of Cytology
|July 17, 1998
Summary
Ryanodine receptors are crucial intracellular calcium release channels involved in cellular functions across many tissues. This review explores their structure, function, and modulation, highlighting their role in health and disease.
Area of Science:
- Molecular Biology
- Cell Biology
- Biochemistry
Background:
- Calcium (Ca2+) signaling is fundamental to eukaryotic cell function.
- Inositol 1,2,5-trisphosphate and ryanodine receptors are key intracellular Ca2+ release channels.
- Ryanodine receptors are vital for excitation-contraction coupling in muscle and play roles in non-contractile tissues.
Purpose of the Study:
- To review ryanodine receptor structure-function relationships.
- To examine molecular mechanisms of ryanodine receptor modulation.
- To discuss the relevance of ryanodine receptors in cellular functions and diseases.
Main Methods:
- Analysis of ryanodine receptor structure and function.
- Investigation of cellular-level channel modulation.
- Review of evidence for gene expression and transcription regulation.
Main Results:
- Identified three homologous ryanodine receptor isoforms, large proteins forming tetramers.
- Described distinct activation mechanisms: electromechanical coupling (isoform 1) and ligand/Ca2+-induced release.
- Highlighted the influence of associated proteins like calmodulin and immunophilins on channel function.
Conclusions:
- Ryanodine receptors are complex, highly regulated channels essential for diverse cellular processes.
- Understanding their structure-function dynamics is key to comprehending their roles in health and disease.
- Further research into ryanodine receptor modulation and gene regulation is warranted.