manganese ion transmembrane transport / suramin binding / establishment of protein localization to endoplasmic reticulum / type B pancreatic cell apoptotic process / Purkinje myocyte to ventricular cardiac muscle cell signaling / regulation of SA node cell action potential / regulation of atrial cardiac muscle cell action potential / left ventricular cardiac muscle tissue morphogenesis / organic cyclic compound binding / regulation of AV node cell action potential ...manganese ion transmembrane transport / suramin binding / establishment of protein localization to endoplasmic reticulum / type B pancreatic cell apoptotic process / Purkinje myocyte to ventricular cardiac muscle cell signaling / regulation of SA node cell action potential / regulation of atrial cardiac muscle cell action potential / left ventricular cardiac muscle tissue morphogenesis / organic cyclic compound binding / regulation of AV node cell action potential / calcium-induced calcium release activity / sarcoplasmic reticulum calcium ion transport / Stimuli-sensing channels / Ion homeostasis / ventricular cardiac muscle cell action potential / regulation of ventricular cardiac muscle cell action potential / positive regulation of sequestering of calcium ion / cyclic nucleotide binding / embryonic heart tube morphogenesis / cardiac muscle hypertrophy / negative regulation of insulin secretion involved in cellular response to glucose stimulus / negative regulation of release of sequestered calcium ion into cytosol / ryanodine-sensitive calcium-release channel activity / neuronal action potential propagation / insulin secretion involved in cellular response to glucose stimulus / release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / response to muscle activity / calcium ion transport into cytosol / calcium ion transmembrane import into cytosol / response to caffeine / cell communication by electrical coupling involved in cardiac conduction / A band / response to redox state / protein maturation by protein folding / 'de novo' protein folding / negative regulation of heart rate / negative regulation of phosphoprotein phosphatase activity / positive regulation of heart rate / FK506 binding / negative regulation of cytosolic calcium ion concentration / positive regulation of axon regeneration / cellular response to caffeine / protein kinase A regulatory subunit binding / intracellularly gated calcium channel activity / protein kinase A catalytic subunit binding / positive regulation of the force of heart contraction / response to magnesium ion / : / detection of calcium ion / smooth muscle contraction / smooth endoplasmic reticulum / negative regulation of ryanodine-sensitive calcium-release channel activity / response to vitamin E / calcium channel inhibitor activity / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / protein peptidyl-prolyl isomerization / T cell proliferation / striated muscle contraction / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / release of sequestered calcium ion into cytosol / Ion homeostasis / regulation of ryanodine-sensitive calcium-release channel activity / monoatomic ion transmembrane transport / extrinsic component of cytoplasmic side of plasma membrane / sarcoplasmic reticulum membrane / calcium channel complex / cellular response to epinephrine stimulus / regulation of cytosolic calcium ion concentration / response to muscle stretch / regulation of heart rate / sarcomere / peptidylprolyl isomerase / sarcoplasmic reticulum / peptidyl-prolyl cis-trans isomerase activity / establishment of localization in cell / calcium-mediated signaling / calcium ion transmembrane transport / calcium channel activity / response to hydrogen peroxide / Stimuli-sensing channels / sarcolemma / Z disc / intracellular calcium ion homeostasis / response to calcium ion / calcium ion transport / : / nuclear envelope / positive regulation of cytosolic calcium ion concentration / protein refolding / scaffold protein binding / transmembrane transporter binding / calmodulin binding / response to hypoxia / signaling receptor binding / calcium ion binding / protein kinase binding / enzyme binding / protein-containing complex / identical protein binding / membrane Similarity search - Function
National Institutes of Health/National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIH/NIAMS)
R01 AR068431
United States
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)
R01 HL133182
United States
Other private
MDA 352845
United States
American Heart Association
19POST34430178
United States
National Institutes of Health/National Cancer Institute (NIH/NCI)
HSSN26120080001E
United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
U24 GM116789
United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
U24 GM116790
United States
Citation
Journal: Sci Adv / Year: 2020 Title: Structural mechanism of two gain-of-function cardiac and skeletal RyR mutations at an equivalent site by cryo-EM. Authors: Kavita A Iyer / Yifan Hu / Ashok R Nayak / Nagomi Kurebayashi / Takashi Murayama / Montserrat Samsó / Abstract: Mutations in ryanodine receptors (RyRs), intracellular Ca channels, are associated with deadly disorders. Despite abundant functional studies, the molecular mechanism of RyR malfunction remains ...Mutations in ryanodine receptors (RyRs), intracellular Ca channels, are associated with deadly disorders. Despite abundant functional studies, the molecular mechanism of RyR malfunction remains elusive. We studied two single-point mutations at an equivalent site in the skeletal (RyR1 R164C) and cardiac (RyR2 R176Q) isoforms using ryanodine binding, Ca imaging, and cryo-electron microscopy (cryo-EM) of the full-length protein. Loss of the positive charge had greater effect on the skeletal isoform, mediated via distortion of a salt bridge network, a molecular latch inducing rotation of a cytoplasmic domain, and partial progression to open-state traits of the large cytoplasmic assembly accompanied by alteration of the Ca binding site, which concur with the major "hyperactive" feature of the mutated channel. Our cryo-EM studies demonstrated the allosteric effect of a mutation situated ~85 Å away from the pore and identified an isoform-specific structural effect.
History
Deposition
Apr 25, 2020
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Header (metadata) release
Aug 5, 2020
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Map release
Aug 5, 2020
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Update
May 29, 2024
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Current status
May 29, 2024
Processing site: RCSB / Status: Released
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Structure visualization
Movie
Surface view with section colored by density value
Cryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV
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Electron microscopy
Microscope
FEI TITAN KRIOS
Specialist optics
Energy filter - Slit width: 20 eV
Image recording
#0 - Image recording ID: 1 / #0 - Film or detector model: GATAN K3 (6k x 4k) / #0 - Number grids imaged: 1 / #0 - Number real images: 8655 / #0 - Average exposure time: 3.4 sec. / #0 - Average electron dose: 50.0 e/Å2 / #1 - Image recording ID: 2 / #1 - Film or detector model: GATAN K3 (6k x 4k) / #1 - Number grids imaged: 1 / #1 - Number real images: 8655 / #1 - Average exposure time: 3.4 sec. / #1 - Average electron dose: 50.0 e/Å2
Electron beam
Acceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
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