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- PDB-5l1d: Structure of rabbit RyR2 in complex with FKBP12.6 in a closed sta... -
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Basic information
Entry | Database: PDB / ID: 5l1d | |||||||||
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Title | Structure of rabbit RyR2 in complex with FKBP12.6 in a closed state (conformation C1) | |||||||||
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![]() | TRANSPORT PROTEIN/ISOMERASE / Calcium Release Channel / Ryanodine Receptor / TRANSPORT PROTEIN-ISOMERASE complex | |||||||||
Function / homology | ![]() positive regulation of sequestering of calcium ion / cyclic nucleotide binding / negative regulation of insulin secretion involved in cellular response to glucose stimulus / negative regulation of release of sequestered calcium ion into cytosol / neuronal action potential propagation / insulin secretion involved in cellular response to glucose stimulus / cell communication by electrical coupling involved in cardiac conduction / response to redox state / protein maturation by protein folding / 'de novo' protein folding ...positive regulation of sequestering of calcium ion / cyclic nucleotide binding / negative regulation of insulin secretion involved in cellular response to glucose stimulus / negative regulation of release of sequestered calcium ion into cytosol / neuronal action potential propagation / insulin secretion involved in cellular response to glucose stimulus / cell communication by electrical coupling involved in cardiac conduction / response to redox state / protein maturation by protein folding / 'de novo' protein folding / negative regulation of heart rate / negative regulation of phosphoprotein phosphatase activity / FK506 binding / positive regulation of axon regeneration / : / smooth muscle contraction / 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 / 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 / sarcoplasmic reticulum membrane / calcium channel complex / regulation of cytosolic calcium ion concentration / peptidylprolyl isomerase / peptidyl-prolyl cis-trans isomerase activity / response to hydrogen peroxide / Stimuli-sensing channels / Z disc / positive regulation of cytosolic calcium ion concentration / protein refolding / transmembrane transporter binding / signaling receptor binding / membrane / cytoplasm / cytosol Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() | |||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 11 Å | |||||||||
![]() | Dhindwal, S. / Lobo, J.J. / Samso, M. | |||||||||
Funding support | ![]()
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![]() | ![]() Title: A cryo-EM-based model of phosphorylation- and FKBP12.6-mediated allosterism of the cardiac ryanodine receptor. Authors: Sonali Dhindwal / Joshua Lobo / Vanessa Cabra / Demetrio J Santiago / Ashok R Nayak / Kelly Dryden / Montserrat Samsó / ![]() Abstract: Type 2 ryanodine receptors (RyR2s) are calcium channels that play a vital role in triggering cardiac muscle contraction by releasing calcium from the sarcoplasmic reticulum into the cytoplasm. ...Type 2 ryanodine receptors (RyR2s) are calcium channels that play a vital role in triggering cardiac muscle contraction by releasing calcium from the sarcoplasmic reticulum into the cytoplasm. Several cardiomyopathies are associated with the abnormal functioning of RyR2. We determined the three-dimensional structure of rabbit RyR2 in complex with the regulatory protein FKBP12.6 in the closed state at 11.8 Å resolution using cryo-electron microscopy and built an atomic model of RyR2. The heterogeneity in the data set revealed two RyR2 conformations that we proposed to be related to the extent of phosphorylation of the P2 domain. Because the more flexible conformation may correspond to RyR2 with a phosphorylated P2 domain, we suggest that phosphorylation may set RyR2 in a conformation that needs less energy to transition to the open state. Comparison of RyR2 from cardiac muscle and RyR1 from skeletal muscle showed substantial structural differences between the two, especially in the helical domain 2 (HD2) structure forming the Clamp domain, which participates in quaternary interactions with the dihydropyridine receptor and neighboring RyRs in RyR1 but not in RyR2. Rigidity of the HD2 domain of RyR2 was enhanced by binding of FKBP12.6, a ligand that stabilizes RyR2 in the closed state. These results help to decipher the molecular basis of the different mechanisms of activation and oligomerization of the RyR isoforms and could be extended to RyR complexes in other tissues. | |||||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 2.5 MB | Display | ![]() |
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-Validation report
Summary document | ![]() | 914.3 KB | Display | ![]() |
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Full document | ![]() | 1 MB | Display | |
Data in XML | ![]() | 301.6 KB | Display | |
Data in CIF | ![]() | 504.5 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8303MC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 487120.906 Da / Num. of mol.: 4 / Source method: isolated from a natural source / Source: (natural) ![]() ![]() #2: Protein | Mass: 17645.984 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Ryanodine Receptor - FKBP12.6 / Type: COMPLEX / Entity ID: all / Source: MULTIPLE SOURCES | ||||||||||||||||||||||||||||||
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Molecular weight | Value: 2.26 MDa / Experimental value: YES | ||||||||||||||||||||||||||||||
Source (natural) | Organism: ![]() ![]() | ||||||||||||||||||||||||||||||
Buffer solution | pH: 7.4 / Details: 1x Protease Inhibitor cocktail | ||||||||||||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 0.1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||||||||||||
Specimen support | Grid material: COPPER / Grid mesh size: 400 divisions/in. / Grid type: Quantifoil R1.2/1.3 | ||||||||||||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 295.15 K Details: Blot for 2 seconds before plunging into liquid ethane (FEI VITROBOT MARK IV). |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 59000 X / Calibrated magnification: 62000 X / Nominal defocus max: 6000 nm / Nominal defocus min: 2000 nm / Cs: 2.7 mm / Alignment procedure: COMA FREE |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER |
Image recording | Average exposure time: 1.2 sec. / Electron dose: 20 e/Å2 / Detector mode: OTHER / Film or detector model: FEI FALCON II (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 858 |
Image scans | Sampling size: 15 µm / Width: 4096 / Height: 4096 / Movie frames/image: 7 / Used frames/image: 1-7 |
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Processing
Software | Name: REFMAC / Version: 5.8.0135 / Classification: refinement | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 13600 Details: Used Relion 1.3 to auto-pick the particles. Inspected each micrograph for false positives. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Symmetry | Point symmetry: C4 (4 fold cyclic) | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 11 Å / Resolution method: FSC 0.5 CUT-OFF / Num. of particles: 13158 / Algorithm: FOURIER SPACE / Details: FREALIGN half maps were used to calculate FSC. / Num. of class averages: 1 / Symmetry type: POINT | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Atomic model building | Protocol: RIGID BODY FIT / Space: RECIPROCAL | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Refinement | Resolution: 11→11 Å / Cor.coef. Fo:Fc: 0.976 / SU B: 505.233 / SU ML: 2.74 Stereochemistry target values: MAXIMUM LIKELIHOOD WITH PHASES Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
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Solvent computation | Ion probe radii: 0.8 Å / Shrinkage radii: 0.8 Å / VDW probe radii: 1.2 Å / Solvent model: MASK | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 461.311 Å2
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