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- PDB-8x4b: Cryo-EM structure of Ryanodine receptor 1 (TM helix S0,100 nM Ca2... -

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Basic information

Entry
Database: PDB / ID: 8x4b
TitleCryo-EM structure of Ryanodine receptor 1 (TM helix S0,100 nM Ca2+, open state)
ComponentsRyanodine receptor 1
KeywordsMEMBRANE PROTEIN / Ryanodine Receptor / Calcium release channel
Function / homology
Function and homology information


ATP-gated ion channel activity / terminal cisterna / ryanodine receptor complex / ryanodine-sensitive calcium-release channel activity / release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / ossification involved in bone maturation / skin development / organelle membrane / cellular response to caffeine / intracellularly gated calcium channel activity ...ATP-gated ion channel activity / terminal cisterna / ryanodine receptor complex / ryanodine-sensitive calcium-release channel activity / release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / ossification involved in bone maturation / skin development / organelle membrane / cellular response to caffeine / intracellularly gated calcium channel activity / outflow tract morphogenesis / toxic substance binding / voltage-gated calcium channel activity / smooth endoplasmic reticulum / striated muscle contraction / skeletal muscle fiber development / muscle contraction / release of sequestered calcium ion into cytosol / sarcoplasmic reticulum membrane / cellular response to calcium ion / sarcoplasmic reticulum / sarcolemma / calcium channel activity / calcium ion transmembrane transport / Z disc / intracellular calcium ion homeostasis / disordered domain specific binding / protein homotetramerization / transmembrane transporter binding / calmodulin binding / calcium ion binding / ATP binding / identical protein binding / membrane
Similarity search - Function
Ryanodine receptor, SPRY domain 2 / : / Ryanodine receptor junctional solenoid repeat / Ryanodine Receptor TM 4-6 / Ryanodine receptor / Ryanodine receptor, SPRY domain 1 / Ryanodine receptor, SPRY domain 3 / Ryanodine Receptor TM 4-6 / Ryanodine receptor Ryr / RyR domain ...Ryanodine receptor, SPRY domain 2 / : / Ryanodine receptor junctional solenoid repeat / Ryanodine Receptor TM 4-6 / Ryanodine receptor / Ryanodine receptor, SPRY domain 1 / Ryanodine receptor, SPRY domain 3 / Ryanodine Receptor TM 4-6 / Ryanodine receptor Ryr / RyR domain / RyR/IP3 receptor binding core, RIH domain superfamily / RyR/IP3R Homology associated domain / Inositol 1,4,5-trisphosphate/ryanodine receptor / RIH domain / RyR and IP3R Homology associated / Inositol 1,4,5-trisphosphate/ryanodine receptor / RIH domain / : / MIR motif / MIR domain / MIR domain profile. / Domain in ryanodine and inositol trisphosphate receptors and protein O-mannosyltransferases / Mir domain superfamily / SPRY domain / B30.2/SPRY domain / B30.2/SPRY domain profile. / B30.2/SPRY domain superfamily / Domain in SPla and the RYanodine Receptor. / SPRY domain / Ion transport domain / Ion transport protein / EF-hand domain pair / Concanavalin A-like lectin/glucanase domain superfamily
Similarity search - Domain/homology
Ryanodine receptor 1
Similarity search - Component
Biological speciesOryctolagus cuniculus (rabbit)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.2 Å
AuthorsChen, Q. / Hu, H.
Funding support China, 4items
OrganizationGrant numberCountry
Ministry of Science and Technology (MoST, China)2017YFA0504700 China
National Natural Science Foundation of China (NSFC)31770785 China
National Natural Science Foundation of China (NSFC)31900868 China
National Natural Science Foundation of China (NSFC)32100963 China
CitationJournal: Nat Commun / Year: 2025
Title: Structural insights into transmembrane helix S0 facilitated RyR1 channel gating by Ca/ATP.
Authors: Risheng Wei / Qiang Chen / Lei Zhang / Congcong Liu / Chuang Liu / Chang-Cheng Yin / Hongli Hu /
Abstract: The type-1 ryanodine receptor (RyR1) is an intracellular calcium release channel for skeletal muscle excitation-contraction coupling. Previous structural studies showed that the RyR1 activity is ...The type-1 ryanodine receptor (RyR1) is an intracellular calcium release channel for skeletal muscle excitation-contraction coupling. Previous structural studies showed that the RyR1 activity is modulated by the exogenous regulators including caffeine, ryanodine, PCB-95 and diamide. An additional transmembrane helix, located adjacent to S1 and S4, has been observed in some structures, although its function remains unclear. Here, we report that using a mild purification procedure, this helix is co-purified with RyR1 and is designated as S0. When RyR1 is coupled with S0, it can be activated by Ca to an open state; however when decoupled from S0, it remains in primed state. S0 regulates the channel conformation by directly affecting the TM domain via the pVSD-S0-S4/S5 linker coupling, which facilitates the dilation of S6. Our results demonstrate that S0 is an essential component of RyR1 and plays a key role in the physiological regulation of RyR1 channel gating.
History
DepositionNov 15, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Mar 5, 2025Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Ryanodine receptor 1
B: Ryanodine receptor 1
C: Ryanodine receptor 1
D: Ryanodine receptor 1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)2,263,7958
Polymers2,263,6354
Non-polymers1604
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein
Ryanodine receptor 1 / RyR1 / Type 1 ryanodine receptor


Mass: 565908.625 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Oryctolagus cuniculus (rabbit) / Gene: RYR1 / Production host: Oryctolagus cuniculus (rabbit) / References: UniProt: P11716
#2: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Ca / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY
Has protein modificationN

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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: Cryo-EM structure of Ryanodine receptor 1 (TM helix S0,100 nM Ca2+, open state)
Type: COMPLEX / Entity ID: #1 / Source: NATURAL
Source (natural)Organism: Oryctolagus cuniculus (rabbit)
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: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2200 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: FEI FALCON III (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 4.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 52414 / Symmetry type: POINT

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