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- EMDB-70597: Structure of human TRPC3 cerebellar splice variant (isoform c) -

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Open data


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Basic information

Entry
Database: EMDB / ID: EMD-70597
TitleStructure of human TRPC3 cerebellar splice variant (isoform c)
Map data
Sample
  • Complex: human TRPC3 isoform c tetrameric complex
    • Protein or peptide: Short transient receptor potential channel 3
  • Ligand: UNKNOWN LIGAND
KeywordsTRPC3 / cerebellar ataxia / MEMBRANE PROTEIN / moonwalker
Function / homology
Function and homology information


positive regulation of cardiac muscle hypertrophy in response to stress / Role of second messengers in netrin-1 signaling / store-operated calcium channel activity / Effects of PIP2 hydrolysis / Elevation of cytosolic Ca2+ levels / inositol 1,4,5 trisphosphate binding / cation channel complex / calcium-activated cation channel activity / TRP channels / response to ATP ...positive regulation of cardiac muscle hypertrophy in response to stress / Role of second messengers in netrin-1 signaling / store-operated calcium channel activity / Effects of PIP2 hydrolysis / Elevation of cytosolic Ca2+ levels / inositol 1,4,5 trisphosphate binding / cation channel complex / calcium-activated cation channel activity / TRP channels / response to ATP / phototransduction / positive regulation of calcium ion transport into cytosol / single fertilization / regulation of cytosolic calcium ion concentration / MECP2 regulates neuronal receptors and channels / response to calcium ion / calcium ion transmembrane transport / calcium channel activity / calcium ion transport / metal ion binding / plasma membrane
Similarity search - Function
Transient receptor potential channel, canonical 3 / Transient receptor ion channel domain / Transient receptor ion channel II / Transient receptor ion channel II / Transient receptor potential channel, canonical / Ankyrin repeats (3 copies) / Ankyrin repeat region circular profile. / ankyrin repeats / Ankyrin repeat / Ankyrin repeat-containing domain superfamily ...Transient receptor potential channel, canonical 3 / Transient receptor ion channel domain / Transient receptor ion channel II / Transient receptor ion channel II / Transient receptor potential channel, canonical / Ankyrin repeats (3 copies) / Ankyrin repeat region circular profile. / ankyrin repeats / Ankyrin repeat / Ankyrin repeat-containing domain superfamily / Ion transport domain / Ion transport protein
Similarity search - Domain/homology
Short transient receptor potential channel 3
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.5 Å
AuthorsBell B / Baker ML / Cordero-Morales JF
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R35GM149218 United States
CitationJournal: Sci Adv / Year: 2026
Title: Functional and structural basis of a hypermorphic TRPC3 variant.
Authors: Briar Bell / Angela M Jaramillo-Granada / Luis O Romero / Irene A Gutierrez / Venkata K P S Mallampalli / Guizhen Fan / Sameer Varma / Matthew L Baker / Irina I Serysheva / Valeria Vásquez ...Authors: Briar Bell / Angela M Jaramillo-Granada / Luis O Romero / Irene A Gutierrez / Venkata K P S Mallampalli / Guizhen Fan / Sameer Varma / Matthew L Baker / Irina I Serysheva / Valeria Vásquez / Julio F Cordero-Morales /
Abstract: Cerebellar ataxias are characterized by impaired motor coordination resulting from neuronal dysfunction within the cerebellum. The mechanisms underlying this pathology and its cerebellar-specific ...Cerebellar ataxias are characterized by impaired motor coordination resulting from neuronal dysfunction within the cerebellum. The mechanisms underlying this pathology and its cerebellar-specific neurodegeneration remain unknown. We uncover how a gain-of-function canonical transient receptor potential member 3 (TRPC3) mutation, coupled with a cerebellum-specific isoform, stabilizes the channel's open state, resists the leading inhibitor Pyr3, and drives calcium-dependent cell death. Restoring calcium homeostasis by expressing a Purkinje cell calcium pump improves cell viability. Transgenic expression of the TRPC3 hypermorphic variant in induces neurodegeneration, confirming its pathogenicity across species. Cryo-electron microscopy and molecular simulations reveal the structural basis for the stabilization of the cerebellar-specific TRPC3 variant in its open state and uncover a druggable allosteric inhibitory binding site. These findings provide an explanation for the vulnerability of cerebellar neurons in TRPC3-associated ataxias and highlight a site for therapeutic intervention.
History
DepositionMay 12, 2025-
Header (metadata) releaseMar 25, 2026-
Map releaseMar 25, 2026-
UpdateApr 8, 2026-
Current statusApr 8, 2026Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_70597.png

Downloads & links

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Map

FileDownload / File: emd_70597.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.)
1.08 Å/pix.
x 320 pix.
= 345.6 Å		1.08 Å/pix.
x 320 pix.
= 345.6 Å		1.08 Å/pix.
x 320 pix.
= 345.6 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.08 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.206
Minimum - Maximum-1.3757766 - 2.6789925
Average (Standard dev.)-0.0012807945 (±0.053784557)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 345.6 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_70597_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_70597_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : human TRPC3 isoform c tetrameric complex

EntireName: human TRPC3 isoform c tetrameric complex
Components
  • Complex: human TRPC3 isoform c tetrameric complex
    • Protein or peptide: Short transient receptor potential channel 3
  • Ligand: UNKNOWN LIGAND

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Supramolecule #1: human TRPC3 isoform c tetrameric complex

SupramoleculeName: human TRPC3 isoform c tetrameric complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Short transient receptor potential channel 3

MacromoleculeName: Short transient receptor potential channel 3 / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 94.18318 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MEGSPSLRRM TVMREKGRRQ AVRGPAFMFN DRGTSLTAEE ERFLDAAEYG NIPVVRKMLE ESKTLNVNCV DYMGQNALQL AVGNEHLEV TELLLKKENL ARIGDALLLA ISKGYVRIVE AILNHPGFAA SKRLTLSPCE QELQDDDFYA YDEDGTRFSP D ITPIILAA ...String:
MEGSPSLRRM TVMREKGRRQ AVRGPAFMFN DRGTSLTAEE ERFLDAAEYG NIPVVRKMLE ESKTLNVNCV DYMGQNALQL AVGNEHLEV TELLLKKENL ARIGDALLLA ISKGYVRIVE AILNHPGFAA SKRLTLSPCE QELQDDDFYA YDEDGTRFSP D ITPIILAA HCQKYEVVHM LLMKGARIER PHDYFCKCGD CMEKQRHDSF SHSRSRINAY KGLASPAYLS LSSEDPVLTA LE LSNELAK LANIEKEFKN DYRKLSMQCK DFVVGVLDLC RDSEEVEAIL NGDLESAEPL EVHRHKASLS RVKLAIKYEV KKF VAHPNC QQQLLTIWYE NLSGLREQTI AIKCLVVLVV ALGLPFLAIG YWIAPCSRLG KILRSPFMKF VAHAASFIIF LGLL VFNAS DRFEGITTLP NITVTDYPKQ IFRVKTTQFT WTEMLIMVWV LGMMWSECKE LWLEGPREYI LQLWNVLDFG MLSIF IAAF TARFLAFLQA TKAQQYVDSY VQESDLSEVT LPPEIQYFTY ARDKWLPSDP QIISEGLYAI AVVLSFSRIA YILPAN ESF GPLQISLGRT VKDIFKFMVL FIMVFFAFMI GMFILYSYYL GAKVNAAFTT VEESFKTLFW SIFGLSEVTS VVLKYDH KF IENIGYVLYG IYNVTMVVVL LNMLIAMINS SYQEIEDDSD VEWKFARSKL WLSYFDDGKT LPPPFSLVPS PKSFVYFI M RIVNFPKCRR RRLQKDIEMG MGNSKSRQIM KRLIKRYVLK AQVDKENDEV NEGELKEIKQ DISSLRYELL EDKSQATEE LAILIHKLSE ISSLRYELLE

UniProtKB: Short transient receptor potential channel 3

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Macromolecule #2: UNKNOWN LIGAND

MacromoleculeName: UNKNOWN LIGAND / type: ligand / ID: 2 / Number of copies: 12 / Formula: UNL
Chemical component information


ChemComp, No image

ChemComp-UNL:
Unknown ligand

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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

BufferpH: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Specialist opticsEnergy filter - Name: GIF Bioquantum / Energy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: COUNTING / Digitization - Dimensions - Width: 3838 pixel / Digitization - Dimensions - Height: 3710 pixel / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.2 µm / Nominal defocus min: 0.8 µm / Nominal magnification: 130000
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: OTHER
Final reconstructionApplied symmetry - Point group: C4 (4 fold cyclic) / Resolution.type: BY AUTHOR / Resolution: 2.5 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 95662
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

9olk


Chain - Source name: PDB / Chain - Initial model type: experimental model / Details: used for refinement into the map
Output model

PDB-9olm:
Structure of human TRPC3 cerebellar splice variant (isoform c)

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