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- PDB-6uqk: Cryo-EM structure of type 3 IP3 receptor revealing presence of a ... -

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Basic information

Entry
Database: PDB / ID: 6uqk
TitleCryo-EM structure of type 3 IP3 receptor revealing presence of a self-binding peptide
Componentsinositol 1,4,5-triphosphate receptor, type 3
KeywordsTRANSPORT PROTEIN / inositol trisphosphate receptor / InsP3R / IP3R / cryoelectron microscopy / ion channel / calcium channel / isothermal titration calorimetry / self binding peptide
Function / homology
Function and homology information


DAG and IP3 signaling / inositol 1,3,4,5 tetrakisphosphate binding / sensory perception of bitter taste / inositol 1,4,5-trisphosphate-gated calcium channel activity / platelet dense tubular network membrane / sensory perception of umami taste / Effects of PIP2 hydrolysis / sensory perception of sweet taste / Elevation of cytosolic Ca2+ levels / PLC beta mediated events ...DAG and IP3 signaling / inositol 1,3,4,5 tetrakisphosphate binding / sensory perception of bitter taste / inositol 1,4,5-trisphosphate-gated calcium channel activity / platelet dense tubular network membrane / sensory perception of umami taste / Effects of PIP2 hydrolysis / sensory perception of sweet taste / Elevation of cytosolic Ca2+ levels / PLC beta mediated events / inositol 1,4,5 trisphosphate binding / inositol hexakisphosphate binding / CLEC7A (Dectin-1) induces NFAT activation / transport vesicle membrane / cytoplasmic side of endoplasmic reticulum membrane / nuclear outer membrane / intracellularly gated calcium channel activity / brush border / Role of phospholipids in phagocytosis / calcium ion homeostasis / Ion homeostasis / release of sequestered calcium ion into cytosol / FCERI mediated Ca+2 mobilization / phosphatidylinositol binding / FCGR3A-mediated IL10 synthesis / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / secretory granule membrane / sarcoplasmic reticulum / VEGFR2 mediated cell proliferation / Regulation of insulin secretion / response to calcium ion / platelet activation / memory / long-term synaptic potentiation / apical part of cell / Sensory perception of sweet, bitter, and umami (glutamate) taste / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / sensory perception of taste / positive regulation of cytosolic calcium ion concentration / Ca2+ pathway / protein homotetramerization / receptor complex / G protein-coupled receptor signaling pathway / neuronal cell body / calcium ion binding / endoplasmic reticulum membrane / nucleolus / endoplasmic reticulum / zinc ion binding / nucleoplasm / ATP 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 / Ion transport domain / Ion transport protein
Similarity search - Domain/homology
Inositol 1,4,5-trisphosphate-gated calcium channel ITPR3
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.77 Å
AuthorsAzumaya, C.M. / Linton, E.A. / Risener, C.J. / Nakagawa, T. / Karakas, E.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Diabetes and Digestive and Kidney Disease (NIH/NIDDK)DK020593 United States
CitationJournal: J Biol Chem / Year: 2020
Title: Cryo-EM structure of human type-3 inositol triphosphate receptor reveals the presence of a self-binding peptide that acts as an antagonist.
Authors: Caleigh M Azumaya / Emily A Linton / Caitlin J Risener / Terunaga Nakagawa / Erkan Karakas /
Abstract: Calcium-mediated signaling through inositol 1,4,5-triphosphate receptors (IPRs) is essential for the regulation of numerous physiological processes, including fertilization, muscle contraction, ...Calcium-mediated signaling through inositol 1,4,5-triphosphate receptors (IPRs) is essential for the regulation of numerous physiological processes, including fertilization, muscle contraction, apoptosis, secretion, and synaptic plasticity. Deregulation of IPRs leads to pathological calcium signaling and is implicated in many common diseases, including cancer and neurodegenerative, autoimmune, and metabolic diseases. Revealing the mechanism of activation and inhibition of this ion channel will be critical to an improved understanding of the biological processes that are controlled by IPRs. Here, we report structural findings of the human type-3 IPR (IPR-3) obtained by cryo-EM (at an overall resolution of 3.8 Å), revealing an unanticipated regulatory mechanism where a loop distantly located in the primary sequence occupies the IP-binding site and competitively inhibits IP binding. We propose that this inhibitory mechanism must differ qualitatively among IPR subtypes because of their diverse loop sequences, potentially serving as a key molecular determinant of subtype-specific calcium signaling in IPRs. In summary, our structural characterization of human IPR-3 provides critical insights into the mechanistic function of IPRs and into subtype-specific regulation of these important calcium-regulatory channels.
History
DepositionOct 20, 2019Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 15, 2020Provider: repository / Type: Initial release
Revision 1.1Jan 22, 2020Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.identifier_ORCID
Revision 1.2Feb 19, 2020Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.3Mar 20, 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: inositol 1,4,5-triphosphate receptor, type 3
B: inositol 1,4,5-triphosphate receptor, type 3
C: inositol 1,4,5-triphosphate receptor, type 3
D: inositol 1,4,5-triphosphate receptor, type 3
hetero molecules


Theoretical massNumber of molelcules
Total (without water)1,114,5998
Polymers1,114,3384
Non-polymers2624
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
inositol 1,4,5-triphosphate receptor, type 3 / IP3 receptor isoform 3 / InsP3R3 / Type 3 inositol 1 / 4 / 5-trisphosphate receptor / Type 3 InsP3 receptor


Mass: 278584.406 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Details: The full sequence of the sample is MSSFLHIGDIVSLYAEGSVNGFISTLGLVDDRCVVEPAAGDLDNPPKKFRDCLFKVCPMNRYSAQKQYWKAKQTKQDKEK ...Details: The full sequence of the sample is MSSFLHIGDIVSLYAEGSVNGFISTLGLVDDRCVVEPAAGDLDNPPKKFRDCLFKVCPMNRYSAQKQYWKAKQTKQDKEK IADVVLLQKLQHAAQMEQKQNDTENKKVHGDVVKYGSVIQLLHMKSNKYLTVNKRLPALLEKNAMRVTLDATGNEGSWLF IQPFWKLRSNGDNVVVGDKVILNPVNAGQPLHASNYELSDNAGCKEVNSVNCNTSWKINLFMQFRDHLEEVLKGGDVVRL FHAEQEKFLTCDEYKGKLQVFLRTTLRQSATSATSSNALWEVEVVHHDPCRGGAGHWNGLYRFKHLATGNYLAAEENPSY KGDASDPKAAGMGAQGRTGRRNAGEKIKYCLVAVPHGNDIASLFELDPTTLQKTDSFVPRNSYVRLRHLCTNTWIQSTNV PIDIEEERPIRLMLGTCPTKEDKEAFAIVSVPVSEIRDLDFANDASSMLASAVEKLNEGFISQNDRRFVIQLLEDLVFFV SDVPNNGQNVLDIMVTKPNRERQKLMREQNILKQVFGILKAPFREKGGEGPLVRLEELSDQKNAPYQHMFRLCYRVLRHS QEDYRKNQEHIAKQFGMMQSQIGYDILAEDTITALLHNNRKLLEKHITKTEVETFVSLVRKNREPRFLDYLSDLCVSNHI AIPVTQELICKCVLDPKNSDILIRTELRPVKEMAQSHEYLSIEYSEEEVWLTWTDKNNEHHEKSVRQLAQEARAGNAHDE NVLSYYRYQLKLFARMCLDRQYLAIDEISQQLGVDLIFLCMADEMLPFDLRASFCHLMLHVHVDRDPQELVTPVKFARLW TEIPTAITIKDYDSNLNASRDDKKNKFANTMEFVEDYLNNVVSEAVPFANEEKNKLTFEVVSLAHNLIYFGFYSFSELLR LTRTLLGIIDCVQGPPAMLQAYEDPGGKNVRRSIQGVGHMMSTMVLSRKQSVFSAPSLSAGASAAEPLDRSKFEENEDIV VMETKLKILEILQFILNVRLDYRISYLLSVFKKEFVEVFPMQDSGADGTAPAFDSTTANMNLDRIGEQAEAMFGVGKTSS MLEVDDEGGRMFLRVLIHLTMHDYAPLVSGALQLLFKHFSQRQEAMHTFKQVQLLISAQDVENYKVIKSELDRLRTMVEK SELWVDKKGSGKGEEVEAGAAKDKKERPTDEEGFLHPPGEKSSENYQIVKGILERLNKMCGVGEQMRKKQQRLLKNMDAH KVMLDLLQIPYDKGDAKMMEILRYTHQFLQKFCAGNPGNQALLHKHLHLFLTPGLLEAETMQHIFLNNYQLCSEISEPVL QHFVHLLATHGRHVQYLDFLHTVIKAEGKYVKKCQDMIMTELTNAGDDVVVFYNDKASLAHLLDMMKAARDGVEDHSPLM YHISLVDLLAACAEGKNVYTEIKCTSLLPLEDVVSVVTHEDCITEVKMAYVNFVNHCYVDTEVEMKEIYTSNHIWTLFEN FTLDMARVCSKREKRVADPTLEKYVLSVVLDTINAFFSSPFSENSTSLQTHQTIVVQLLQSTTRLLECPWLQQQHKGSVE ACIRTLAMVAKGRAILLPMDLDAHISSMLSSGASCAAAAQRNASSYKATTRAFPRVTPTANQWDYKNIIEKLQDIITALE ERLKPLVQAELSVLVDVLHWPELLFLEGSEAYQRCESGGFLSKLIQHTKDLMESEEKLCIKVLRTLQQMLLKKTKYGDRG NQLRKMLLQNYLQNRKSTSRGDLPDPIGTGLDPDWSAIAATQCRLDKEGATKLVCDLITSTKNEKIFQESIGLAIHLLDG GNTEIQKSFHNLMMSDKKSERFFKVLHDRMKRAQQETKSTVAVNMNDLGSQPHEDREPVDPTTKGRVASFSIPGSSSRYS LGPSLRRGHEVSERVQSSEMGTSVLIMQPILRFLQLLCENHNRDLQNFLRCQNNKTNYNLVCETLQFLDIMCGSTTGGLG LLGLYINEDNVGLVIQTLETLTEYCQGPCHENQTCIVTHESNGIDIITALILNDISPLCKYRMDLVLQLKDNASKLLLAL MESRHDSENAERILISLRPQELVDVIKKAYLQEEERENSEVSPREVGHNIYILALQLSRHNKQLQHLLKPVKRIQEEEAE GISSMLSLNNKQLSQMLKSSAPAQEEEEDPLAYYENHTSQIEIVRQDRSMEQIVFPVPGICQFLTEETKHRLFTTTEQDE QGSKVSDFFDQSSFLHNEMEWQRKLRSMPLIYWFSRRMTLWGSISFNLAVFINIIIAFFYPYMEGASTGVLDSPLISLLF WILICFSIAALFTKRYSIRPLIVALILRSIYYLGIGPTLNILGALNLTNKIVFVVSFVGNRGTFIRGYKAMVMDMEFLYH VGYILTSVLGLFAHELFYSILLFDLIYREETLFNVIKSVTRNGRSILLTALLALILVYLFSIVGFLFLKDDFILEVDRLP NNHSTASPLGMPHGAAAFVDTCSGDKMDCVSGLSVPEVLEEDRELDSTERACDTLLMCIVTVMNHGLRNGGGVGDILRKP SKDESLFPARVVYDLLFFFIVIIIVLNLIFGVIIDTFADLRSEKQKKEEILKTTCFICGLERDKFDNKTVSFEEHIKLEH NMWNYLYFIVLVRVKNKTDYTGPESYVAQMIKNKNLDWFPRMRAMSLVSNEGEGEQNEIRILQDKLNSTMKLVSHLTAQL NELKEQMTEQRKRRQRLGFVDVQNCISRGENLYFQSAWSHPQFEKGGGSGGGSGGSAWSHPQFEK
Source: (gene. exp.) Homo sapiens (human) / Gene: itpr3 / Cell line (production host): Sf9 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q14573*PLUS
#2: Chemical
ChemComp-ZN / ZINC ION


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

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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: inositol 1,4,5-triphosphate receptor, type 3 / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 1.2 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm) / Strain: Sf9
Buffer solutionpH: 8
Buffer component
IDConc.NameBuffer-ID
1200 mMNaCl1
220 mMTris-HCl1
31 mMEDTA1
42 mMTCEP1
50.005 %Lauryl maltose neopentyl glycol1
60.005 %GDN1
SpecimenConc.: 1.3 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: 25 mA / Grid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: C-flat-2/1
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 281 K / Details: The grid was blotted for 3 seconds at force 1

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Electron microscopy imaging

Experimental equipment
Model: Tecnai Polara / Image courtesy: FEI Company
MicroscopyModel: FEI POLARA 300
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 31000 X / Cs: 2.2 mm
Specimen holderCryogen: NITROGEN
Image recordingElectron dose: 70 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM software
IDNameCategory
4GctfCTF correction
7Cootmodel fitting
11RELIONclassification
12cisTEM3D reconstruction
13PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C4 (4 fold cyclic)
3D reconstructionResolution: 3.77 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 82511 / Symmetry type: POINT

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