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- EMDB-34237: AtOSCA3.1 channel extended state -

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Basic information

Entry
Database: EMDB / ID: EMD-34237
TitleAtOSCA3.1 channel extended state
Map data
Sample
  • Complex: AtOSCA3.1 channel extended state
    • Protein or peptide: CSC1-like protein ERD4
Keywordschannel / MEMBRANE PROTEIN
Function / homology
Function and homology information


plasmodesma / plant-type vacuole / chloroplast envelope / calcium-activated cation channel activity / mRNA binding / nucleus / plasma membrane
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
CSC1-like protein ERD4
Similarity search - Component
Biological speciesArabidopsis (plant) / Arabidopsis thaliana (thale cress)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.3 Å
AuthorsZhang MF
Funding support1 items
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 6, 2022-
Header (metadata) releaseJun 14, 2023-
Map releaseJun 14, 2023-
UpdateJul 3, 2024-
Current statusJul 3, 2024Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_34237.png

Downloads & links

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Map

FileDownload / File: emd_34237.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 320 pix.
= 266.88 Å		0.83 Å/pix.
x 320 pix.
= 266.88 Å		0.83 Å/pix.
x 320 pix.
= 266.88 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.834 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.17
Minimum - Maximum-0.62021 - 1.0136604
Average (Standard dev.)-0.0010717415 (±0.03138214)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 266.88 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_34237_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_34237_half_map_2.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : AtOSCA3.1 channel extended state

EntireName: AtOSCA3.1 channel extended state
Components
  • Complex: AtOSCA3.1 channel extended state
    • Protein or peptide: CSC1-like protein ERD4

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Supramolecule #1: AtOSCA3.1 channel extended state

SupramoleculeName: AtOSCA3.1 channel extended state / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Arabidopsis (plant)

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Macromolecule #1: CSC1-like protein ERD4

MacromoleculeName: CSC1-like protein ERD4 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Arabidopsis thaliana (thale cress)
Molecular weightTheoretical: 82.017727 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MEFGSFLVSL GTSFVIFVIL MLLFTWLSRK SGNAPIYYPN RILKGLEPWE GTSLTRNPFA WMREALTSSE QDVVNLSGVD TAVHFVFLS TVLGIFACSS LLLLPTLLPL AATDNNIKNT KNATDTTSKG TFSQLDNLSM ANITKKSSRL WAFLGAVYWI S LVTYFFLW ...String:
MEFGSFLVSL GTSFVIFVIL MLLFTWLSRK SGNAPIYYPN RILKGLEPWE GTSLTRNPFA WMREALTSSE QDVVNLSGVD TAVHFVFLS TVLGIFACSS LLLLPTLLPL AATDNNIKNT KNATDTTSKG TFSQLDNLSM ANITKKSSRL WAFLGAVYWI S LVTYFFLW KAYKHVSSLR AQALMSADVK PEQFAILVRD MPAPPDGQTQ KEFIDSYFRE IYPETFYRSL VATENSKVNK IW EKLEGYK KKLARAEAIL AATNNRPTNK TGFCGLVGKQ VDSIEYYTEL INESVAKLET EQKAVLAEKQ QTAAVVFFTT RVA AASAAQ SLHCQMVDKW TVTEAPEPRQ LLWQNLNIKL FSRIIRQYFI YFFVAVTILF YMIPIAFVSA ITTLKNLQRI IPFI KPVVE ITAIRTVLES FLPQIALIVF LAMLPKLLLF LSKAEGIPSQ SHAIRAASGK YFYFSVFNVF IGVTLAGTLF NTVKD IAKN PKLDMIINLL ATSLPKSATF FLTYVALKFF IGYGLELSRI IPLIIFHLKK KYLCKTEAEV KEAWYPGDLS YATRVP GDM LILTITFCYS VIAPLILIFG ITYFGLGWLV LRNQALKVYV PSYESYGRMW PHIHQRILAA LFLFQVVMFG YLGAKTF FY TALVIPLIIT SLIFGYVCRQ KFYGGFEHTA LEVACRELKQ SPDLEEIFRA YIPHSLSSHK PEEHEFKGAM SRYQDFNA I AGV

UniProtKB: CSC1-like protein ERD4

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration5 mg/mL
BufferpH: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: FEI FALCON III (4k x 4k) / Average electron dose: 60.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: OTHER / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.0 µm / Nominal defocus min: 1.2 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.3 Å / Resolution method: DIFFRACTION PATTERN/LAYERLINES / Number images used: 24800
Initial angle assignmentType: NOT APPLICABLE
Final angle assignmentType: NOT APPLICABLE

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