FUNCTION: Calsequestrin is a high-capacity, moderate affinity, calcium-binding protein and thus acts as an internal calcium store in muscle. Calcium ions are bound by clusters of acidic residues at the protein surface, especially at the interface between subunits. Can bind around 60 Ca(2+) ions. Reg...
FUNCTION: Calsequestrin is a high-capacity, moderate affinity, calcium-binding protein and thus acts as an internal calcium store in muscle. Calcium ions are bound by clusters of acidic residues at the protein surface, especially at the interface between subunits. Can bind around 60 Ca(2+) ions. Regulates the release of lumenal Ca(2+) via the calcium release channel RYR2; this plays an important role in triggering muscle contraction. Plays a role in excitation-contraction coupling in the heart and in regulating the rate of heart beats. {ECO:0000269|PubMed:16908766, ECO:0000269|PubMed:17881003, ECO:0000269|PubMed:18399795, ECO:0000269|PubMed:21416293}.
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GO - Biological processes (BP):
cardiac muscle contraction [GO:0060048]; cellular calcium ion homeostasis [GO:0006874]; cellular response to caffeine [GO:0071313]; detection of calcium ion [GO:0005513]; negative regulation of potassium ion transmembrane transporter activity [GO:1901017]; negative regulation of potassium ion transp...
cardiac muscle contraction [GO:0060048]; cellular calcium ion homeostasis [GO:0006874]; cellular response to caffeine [GO:0071313]; detection of calcium ion [GO:0005513]; negative regulation of potassium ion transmembrane transporter activity [GO:1901017]; negative regulation of potassium ion transport [GO:0043267]; negative regulation of ryanodine-sensitive calcium-release channel activity [GO:0060315]; protein polymerization [GO:0051258]; Purkinje myocyte to ventricular cardiac muscle cell signaling [GO:0086029]; regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion [GO:0010881]; regulation of cell communication by electrical coupling [GO:0010649]; regulation of heart rate [GO:0002027]; regulation of membrane repolarization [GO:0060306]; regulation of release of sequestered calcium ion into cytosol [GO:0051279]; regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum [GO:0010880]; sequestering of calcium ion [GO:0051208]; striated muscle contraction [GO:0006941]
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GO - Molecular function (MF):
calcium-dependent protein binding [GO:0048306]; calcium ion binding [GO:0005509]; calcium ion sequestering activity [GO:0140314]; protein homodimerization activity [GO:0042803]...
calcium-dependent protein binding [GO:0048306]; calcium ion binding [GO:0005509]; calcium ion sequestering activity [GO:0140314]; protein homodimerization activity [GO:0042803]
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GO - Cellular component (CC):
calcium channel complex [GO:0034704]; cytoplasm [GO:0005737]; junctional sarcoplasmic reticulum membrane [GO:0014701]; sarcoplasmic reticulum [GO:0016529]; sarcoplasmic reticulum lumen [GO:0033018]; sarcoplasmic reticulum membrane [GO:0033017]; Z disc [GO:0030018]...
calcium channel complex [GO:0034704]; cytoplasm [GO:0005737]; junctional sarcoplasmic reticulum membrane [GO:0014701]; sarcoplasmic reticulum [GO:0016529]; sarcoplasmic reticulum lumen [GO:0033018]; sarcoplasmic reticulum membrane [GO:0033017]; Z disc [GO:0030018]
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