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Sarcoplasmic Reticulum Calcium Binding Proteins (SR Ca²⁺ Binding Proteins)
- Target
- SR Ca²⁺ Binding Proteins
- Molecular classification
- Calcium-binding protein
01
Overview
Sarcoplasmic reticulum (SR) calcium binding proteins are specialized proteins within the SR of muscle cells that bind and store calcium ions (Ca²⁺). These proteins are essential for regulating intracellular calcium levels, enabling proper muscle contraction and relaxation cycles. Key proteins include Calsequestrin (CASQ1/CASQ2), Sarcalumenin (SAR), and Histidine-rich Calcium-binding Protein (HRC). They function as buffers with high capacity and variable affinity, facilitating rapid changes in cytosolic Ca²⁺ without toxic accumulation. Dysfunction can contribute to myopathies or cardiomyopathies.
- Other names
- CalsequestrinCASQ1CASQ2SarcalumeninSARHistidine-rich Calcium-binding ProteinHRC
02
Biological functions
Calcium bufferingCalcium storageCalcium release regulationExcitation-contraction couplingMuscle contractionMuscle relaxation
03
Disease associations
MyopathyCardiomyopathy
04
Safety considerations
Dysregulation can lead to impaired excitation-contraction couplingAbnormal calcium storage/release dynamics
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