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- PDB-8grn: AtOSCA1.1 extended state -

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Basic information

Entry
Database: PDB / ID: 8grn
TitleAtOSCA1.1 extended state
ComponentsProtein OSCA1
KeywordsMEMBRANE PROTEIN / channel
Function / homology
Function and homology information


regulation of calcium ion import / mechanosensitive monoatomic ion channel activity / calcium-activated cation channel activity / cellular hyperosmotic response / response to osmotic stress / monoatomic cation channel activity / protein tetramerization / plasma membrane / cytosol
Similarity search - Function
CSC1/OSCA1-like, 7TM region / CSC1/OSCA1-like, cytosolic domain / CSC1/OSCA1-like, N-terminal transmembrane domain / Calcium permeable stress-gated cation channel 1-like / Calcium-dependent channel, 7TM region, putative phosphate / Late exocytosis, associated with Golgi transport / Cytosolic domain of 10TM putative phosphate transporter
Similarity search - Domain/homology
[1-MYRISTOYL-GLYCEROL-3-YL]PHOSPHONYLCHOLINE / Hyperosmolality-gated Ca2+ permeable channel 1.1
Similarity search - Component
Biological speciesArabidopsis thaliana (thale cress)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.5 Å
AuthorsZhang, M.F.
Funding support1items
OrganizationGrant numberCountry
Not funded
CitationJournal: Nat Commun / Year: 2023
Title: A mechanical-coupling mechanism in OSCA/TMEM63 channel mechanosensitivity.
Authors: Mingfeng Zhang / Yuanyue Shan / Charles D Cox / Duanqing Pei /
Abstract: Mechanosensitive (MS) ion channels are a ubiquitous type of molecular force sensor sensing forces from the surrounding bilayer. The profound structural diversity in these channels suggests that the ...Mechanosensitive (MS) ion channels are a ubiquitous type of molecular force sensor sensing forces from the surrounding bilayer. The profound structural diversity in these channels suggests that the molecular mechanisms of force sensing follow unique structural blueprints. Here we determine the structures of plant and mammalian OSCA/TMEM63 proteins, allowing us to identify essential elements for mechanotransduction and propose roles for putative bound lipids in OSCA/TMEM63 mechanosensation. Briefly, the central cavity created by the dimer interface couples each subunit and modulates dimeric OSCA/TMEM63 channel mechanosensitivity through the modulating lipids while the cytosolic side of the pore is gated by a plug lipid that prevents the ion permeation. Our results suggest that the gating mechanism of OSCA/TMEM63 channels may combine structural aspects of the 'lipid-gated' mechanism of MscS and TRAAK channels and the calcium-induced gating mechanism of the TMEM16 family, which may provide insights into the structural rearrangements of TMEM16/TMC superfamilies.
History
DepositionSep 2, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jun 14, 2023Provider: repository / Type: Initial release
Revision 1.1Jul 26, 2023Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year
Revision 1.2Jul 3, 2024Group: Data collection / Category: chem_comp_atom / chem_comp_bond / em_admin / Item: _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Protein OSCA1
B: Protein OSCA1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)176,3314
Polymers175,3942
Non-polymers9372
Water00
1


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

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Components

#1: Protein Protein OSCA1 / CSC1-like protein At4g04340 / Hyperosmolality-gated Ca2+ permeable channel 1.1 / AtOSCA1.1 / ...CSC1-like protein At4g04340 / Hyperosmolality-gated Ca2+ permeable channel 1.1 / AtOSCA1.1 / Protein reduced hyperosmolality-induced [Ca(2+)]i increase 1


Mass: 87697.008 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Arabidopsis thaliana (thale cress) / Gene: OSCA1, OSCA1.1, At4g04340, T19B17.6 / Production host: Homo sapiens (human) / References: UniProt: Q9XEA1
#2: Chemical ChemComp-LPC / [1-MYRISTOYL-GLYCEROL-3-YL]PHOSPHONYLCHOLINE


Mass: 468.585 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C22H47NO7P / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY

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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: AtOSCA1.1 extended state / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Arabidopsis (plant)
Source (recombinant)Organism: Homo sapiens (human)
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: SPOT SCAN
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 3000 nm / Nominal defocus min: 2000 nm
Image recordingElectron dose: 60 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

CTF correctionType: NONE
3D reconstructionResolution: 2.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 838000 / Symmetry type: POINT

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