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- PDB-8ear: Structure of the full-length IP3R1 channel determined in the pres... -

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Basic information

Entry
Database: PDB / ID: 8ear
TitleStructure of the full-length IP3R1 channel determined in the presence of Calcium/IP3/ATP
ComponentsInositol 1,4,5-trisphosphate receptor type 1
KeywordsMEMBRANE PROTEIN / Calcium channel / lipid nanodisc
Function / homology
Function and homology information


Effects of PIP2 hydrolysis / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / inositol 1,4,5-trisphosphate receptor activity involved in regulation of postsynaptic cytosolic calcium levels / release of sequestered calcium ion into cytosol by endoplasmic reticulum / smooth endoplasmic reticulum membrane / cGMP effects / Elevation of cytosolic Ca2+ levels / platelet dense tubular network / calcineurin complex / platelet dense granule membrane ...Effects of PIP2 hydrolysis / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / inositol 1,4,5-trisphosphate receptor activity involved in regulation of postsynaptic cytosolic calcium levels / release of sequestered calcium ion into cytosol by endoplasmic reticulum / smooth endoplasmic reticulum membrane / cGMP effects / Elevation of cytosolic Ca2+ levels / platelet dense tubular network / calcineurin complex / platelet dense granule membrane / : / epithelial fluid transport / phospholipase C-activating G protein-coupled acetylcholine receptor signaling pathway / inositol 1,4,5-trisphosphate-gated calcium channel activity / calcium import into the mitochondrion / voluntary musculoskeletal movement / inositol 1,4,5 trisphosphate binding / negative regulation of calcium-mediated signaling / positive regulation of calcium ion transport / endoplasmic reticulum calcium ion homeostasis / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / positive regulation of hepatocyte proliferation / nuclear inner membrane / Ion homeostasis / transport vesicle membrane / ligand-gated ion channel signaling pathway / dendrite development / intracellularly gated calcium channel activity / intrinsic apoptotic signaling pathway in response to endoplasmic reticulum stress / single fertilization / regulation of cytosolic calcium ion concentration / calcium channel inhibitor activity / cellular response to cAMP / release of sequestered calcium ion into cytosol / phosphatidylinositol binding / secretory granule membrane / sarcoplasmic reticulum / liver regeneration / post-embryonic development / GABA-ergic synapse / synaptic membrane / cell morphogenesis / positive regulation of insulin secretion / positive regulation of neuron projection development / Schaffer collateral - CA1 synapse / calcium ion transport / nuclear envelope / presynapse / positive regulation of cytosolic calcium ion concentration / protein phosphatase binding / phospholipase C-activating G protein-coupled receptor signaling pathway / protein homotetramerization / cellular response to hypoxia / transmembrane transporter binding / response to hypoxia / postsynapse / postsynaptic density / positive regulation of apoptotic process / protein domain specific binding / neuronal cell body / synapse / calcium ion binding / dendrite / endoplasmic reticulum membrane / protein-containing complex binding / negative regulation of apoptotic process / nucleolus / perinuclear region of cytoplasm / endoplasmic reticulum / protein homodimerization activity / protein-containing complex / ATP binding / identical protein binding / membrane / plasma membrane / cytoplasm
Similarity search - Function
Inositol 1,4,5-trisphosphate receptor / 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 ...Inositol 1,4,5-trisphosphate receptor / 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 / Trefoil (Acidic Fibroblast Growth Factor, subunit A) - #50 / Trefoil (Acidic Fibroblast Growth Factor, subunit A) / Trefoil / Ion transport domain / Ion transport protein / Armadillo-type fold / Mainly Beta
Similarity search - Domain/homology
ADENOSINE-5'-TRIPHOSPHATE / D-MYO-INOSITOL-1,4,5-TRIPHOSPHATE / Chem-PLX / Inositol 1,4,5-trisphosphate-gated calcium channel ITPR1
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å
AuthorsFan, G. / Baker, M.R. / Terry, L.E. / Arige, V. / Chen, M. / Seryshev, A.B. / Baker, M.L. / Ludtke, S.J. / Yule, D.I. / Serysheva, I.I.
Funding support United States, 7items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM072804 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM080139 United States
National Institutes of Health/National Institute of Dental and Craniofacial Research (NIH/NIDCR)DE019245 United States
Welch FoundationAU-2014-20190330 United States
Welch FoundationAU-2014-20220331 United States
American Heart Association18CDA34110086 United States
Cancer Prevention and Research Institute of Texas (CPRIT)RP190602 United States
CitationJournal: Nat Commun / Year: 2022
Title: Conformational motions and ligand-binding underlying gating and regulation in IPR channel.
Authors: Guizhen Fan / Mariah R Baker / Lara E Terry / Vikas Arige / Muyuan Chen / Alexander B Seryshev / Matthew L Baker / Steven J Ludtke / David I Yule / Irina I Serysheva /
Abstract: Inositol-1,4,5-trisphosphate receptors (IPRs) are activated by IP and Ca and their gating is regulated by various intracellular messengers that finely tune the channel activity. Here, using single ...Inositol-1,4,5-trisphosphate receptors (IPRs) are activated by IP and Ca and their gating is regulated by various intracellular messengers that finely tune the channel activity. Here, using single particle cryo-EM analysis we determined 3D structures of the nanodisc-reconstituted IPR1 channel in two ligand-bound states. These structures provide unprecedented details governing binding of IP, Ca and ATP, revealing conformational changes that couple ligand-binding to channel opening. Using a deep-learning approach and 3D variability analysis we extracted molecular motions of the key protein domains from cryo-EM density data. We find that IP binding relies upon intrinsic flexibility of the ARM2 domain in the tetrameric channel. Our results highlight a key role of dynamic side chains in regulating gating behavior of IPR channels. This work represents a stepping-stone to developing mechanistic understanding of conformational pathways underlying ligand-binding, activation and regulation of the channel.
History
DepositionAug 29, 2022Deposition site: RCSB / Processing site: RCSB
Revision 1.0Nov 23, 2022Provider: repository / Type: Initial release
Revision 1.1Oct 23, 2024Group: Data collection / Refinement description / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_3d_fitting_list / em_admin / pdbx_entry_details / pdbx_initial_refinement_model / pdbx_modification_feature
Item: _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id ..._em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type / _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Inositol 1,4,5-trisphosphate receptor type 1
B: Inositol 1,4,5-trisphosphate receptor type 1
C: Inositol 1,4,5-trisphosphate receptor type 1
D: Inositol 1,4,5-trisphosphate receptor type 1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)1,280,72160
Polymers1,254,6304
Non-polymers26,09256
Water00
1


  • Idetical with deposited unit
  • defined by author
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 1 types, 4 molecules ABCD

#1: Protein
Inositol 1,4,5-trisphosphate receptor type 1 / IP3 receptor isoform 1 / InsP3R1 / Type 1 inositol 1 / 4 / 5-trisphosphate receptor / Type 1 InsP3 receptor


Mass: 313657.406 Da / Num. of mol.: 4 / Source method: isolated from a natural source / Source: (natural) Rattus norvegicus (Norway rat) / Organ: cerebellum / References: UniProt: P29994

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Non-polymers , 5 types, 56 molecules

#2: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Zn
#3: Chemical
ChemComp-ATP / ADENOSINE-5'-TRIPHOSPHATE


Mass: 507.181 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C10H16N5O13P3 / Feature type: SUBJECT OF INVESTIGATION / Comment: ATP, energy-carrying molecule*YM
#4: Chemical
ChemComp-I3P / D-MYO-INOSITOL-1,4,5-TRIPHOSPHATE


Mass: 420.096 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C6H15O15P3 / Feature type: SUBJECT OF INVESTIGATION
#5: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 16 / Source method: obtained synthetically / Formula: Ca / Feature type: SUBJECT OF INVESTIGATION
#6: Chemical...
ChemComp-PLX / (9R,11S)-9-({[(1S)-1-HYDROXYHEXADECYL]OXY}METHYL)-2,2-DIMETHYL-5,7,10-TRIOXA-2LAMBDA~5~-AZA-6LAMBDA~5~-PHOSPHAOCTACOSANE-6,6,11-TRIOL


Mass: 767.132 Da / Num. of mol.: 28 / Source method: obtained synthetically / Formula: C42H89NO8P / Comment: phospholipid*YM

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Details

Has ligand of interestY
Has protein modificationY

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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: Type 1 inositol 1,4,5-trisphosphate receptor tetrameric protein complex
Type: COMPLEX / Entity ID: #1 / Source: NATURAL
Molecular weightValue: 1.3 MDa / Experimental value: NO
Source (natural)Organism: Rattus norvegicus (Norway rat) / Cellular location: membrane / Organ: cerebellum / Organelle: endoplasmic reticulum
Buffer solutionpH: 7.4
SpecimenConc.: 1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: reconstituted in lipid nanodisc
Specimen supportGrid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R2/1
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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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 magnification: 130000 X / Calibrated magnification: 46943 X / Nominal defocus max: 2500 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 0.2 sec. / Electron dose: 49 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 QUANTUM (4k x 4k) / Num. of real images: 24478
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV
Image scansSampling size: 5 µm / Width: 3840 / Height: 3712 / Movie frames/image: 35

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Processing

Software
NameVersionClassificationNB
PHENIXdev_svn:refinement
UCSF ChimeraX1.3/v9model building
EM software
IDNameVersionCategory
2EPUimage acquisition
4GctfCTF correction
7Cootmodel fitting
9PHENIXmodel refinement
10RELION3initial Euler assignment
11RELION3final Euler assignment
12RELION3classification
13RELION33D reconstruction
CTF correctionType: NONE
Particle selectionNum. of particles selected: 1452797 / Details: NeuralNet autopicking in EMAN2
SymmetryPoint symmetry: C4 (4 fold cyclic)
3D reconstructionResolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 133740 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Atomic model buildingPDB-ID: 7LHE

7lhe


Accession code: 7LHE / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00379864
ELECTRON MICROSCOPYf_angle_d0.583107720
ELECTRON MICROSCOPYf_dihedral_angle_d9.51911132
ELECTRON MICROSCOPYf_chiral_restr0.0412136
ELECTRON MICROSCOPYf_plane_restr0.00413640

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