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- PDB-6jg3: Cryo-EM structure of RyR2 (Ca2+ alone dataset) -

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Basic information

Entry
Database: PDB / ID: 6jg3
TitleCryo-EM structure of RyR2 (Ca2+ alone dataset)
ComponentsRyanodine receptor 2
KeywordsMEMBRANE PROTEIN
Biological speciesSus scrofa (pig)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 6.1 Å
AuthorsChi, X.M. / Gong, D.S. / Ren, K. / Zhou, G.W. / Huang, G.X.Y. / Lei, J.L. / Zhou, Q. / Yan, N.
CitationJournal: Proc Natl Acad Sci U S A / Year: 2019
Title: Molecular basis for allosteric regulation of the type 2 ryanodine receptor channel gating by key modulators.
Authors: Ximin Chi / Deshun Gong / Kang Ren / Gewei Zhou / Gaoxingyu Huang / Jianlin Lei / Qiang Zhou / Nieng Yan /
Abstract: The type 2 ryanodine receptor (RyR2) is responsible for releasing Ca from the sarcoplasmic reticulum of cardiomyocytes, subsequently leading to muscle contraction. Here, we report 4 cryo-electron ...The type 2 ryanodine receptor (RyR2) is responsible for releasing Ca from the sarcoplasmic reticulum of cardiomyocytes, subsequently leading to muscle contraction. Here, we report 4 cryo-electron microscopy (cryo-EM) structures of porcine RyR2 bound to distinct modulators that, together with our published structures, provide mechanistic insight into RyR2 regulation. Ca alone induces a contraction of the central domain that facilitates the dilation of the S6 bundle but is insufficient to open the pore. The small-molecule agonist PCB95 helps Ca to overcome the barrier for opening. FKBP12.6 induces a relaxation of the central domain that decouples it from the S6 bundle, stabilizing RyR2 in a closed state even in the presence of Ca and PCB95. Although the channel is open when PCB95 is replaced by caffeine and adenosine 5'-triphosphate (ATP), neither of the modulators alone can sufficiently counter the antagonistic effect to open the channel. Our study marks an important step toward mechanistic understanding of the sophisticated regulation of this key channel whose aberrant activity engenders life-threatening cardiac disorders.
History
DepositionFeb 13, 2019Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Dec 11, 2019Provider: repository / Type: Initial release
Revision 1.1Jan 1, 2020Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.2Mar 27, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

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Assembly

Deposited unit
A: Ryanodine receptor 2
B: Ryanodine receptor 2
C: Ryanodine receptor 2
D: Ryanodine receptor 2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)2,259,8848
Polymers2,259,6234
Non-polymers2624
Water0
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area18720 Å2
ΔGint-112 kcal/mol
Surface area649500 Å2

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Components

#1: Protein
Ryanodine receptor 2 /


Mass: 564905.625 Da / Num. of mol.: 4 / Source method: isolated from a natural source / Source: (natural) Sus scrofa (pig)
#2: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Zn

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: homotetramerTetrameric protein / Type: COMPLEX / Entity ID: #1 / Source: NATURAL
Source (natural)Organism: Sus scrofa (pig)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 48.6 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM software
IDNameVersionCategory
4GctfCTF correction
11RELION2final Euler assignment
13RELION23D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C4 (4 fold cyclic)
3D reconstructionResolution: 6.1 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 24250 / Symmetry type: POINT

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