Ryanodine receptors: structure, expression, molecular details, and function in calcium release

Area of Science:

• Biochemistry
• Molecular Biology
• Physiology

Background:

• Ryanodine receptors (RyRs) are critical Ca(2+) release channels in the sarcoplasmic/endoplasmic reticulum membrane.
• They play a vital role in excitation-contraction coupling in cardiac and skeletal muscle.
• RyRs are the largest known ion channels, existing as three mammalian isoforms (RyR1-3).

Purpose of the Study:

• To review current understanding of RyR structure, function, and regulation.
• To explore the role of RyRs in associated human disorders.
• To assess the current state of research on RyR-related diseases.

Main Methods:

• Literature review of current concepts in RyR research.
• Analysis of structural and functional properties of RyRs.
• Examination of genetic mutations linked to RyR-associated disorders.

Main Results:

• RyRs are homotetrameric proteins regulated by phosphorylation, redox, ions, and small proteins.
• The cytoplasmic domain interacts with modulators, while the carboxy-terminal forms the pore.
• Mutations in RyR2 cause catecholaminergic polymorphic ventricular tachycardia; RyR1 mutations cause central core disease and malignant hyperthermia.

Conclusions:

• RyRs are complex molecular machines essential for muscle function.
• Dysregulation and mutations in RyRs lead to significant human pathologies.
• Further research into RyR structure-function is crucial for understanding and treating associated diseases.