9OLX | pdb_00009olx

Structure of a constitutively open human TRPC3 mutant in the inhibited state

PDB DOI: https://doi.org/10.2210/pdb9OLX/pdb
EM Map EMD-70601: EMDB EMDataResource

Classification: MEMBRANE PROTEIN
Organism(s): Homo sapiens
Expression System: Homo sapiens
Mutation(s): Yes

Deposited: 2025-05-13 Released: 2026-03-25
Deposition Author(s): Bell, B., Baker, M.L., Cordero-Morales, J.F.
Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 3.30 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

wwPDB Validation 3D Report Full Report

This is version 1.1 of the entry. See complete history.

Literature

Functional and structural basis of a hypermorphic TRPC3 variant.

Bell, B., Jaramillo-Granada, A.M., Romero, L.O., Gutierrez, I.A., Mallampalli, V.K.P.S., Fan, G., Varma, S., Baker, M.L., Serysheva, I.I., Vasquez, V., Cordero-Morales, J.F.

(2026) Sci Adv 12: eaec9284-eaec9284

PubMed: 41880503 Search on PubMed Search on PubMed Central
DOI: https://doi.org/10.1126/sciadv.aec9284
Primary Citation Related Structures:
9OLK, 9OLL, 9OLM, 9OLX, 9OPU

PubMed 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 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 Caenorhabditis elegans 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.

Organizational Affiliation

Department of Biochemistry and Molecular Biology, Center for Membrane Biology, McGovern Medical School at the University of Texas Health Science Center at Houston, Houston, TX, USA.

Macromolecule Content

Total Structure Weight: 382.46 kDa
Atom Count: 24,592
Modeled Residue Count: 2,980
Deposited Residue Count: 3,280
Unique protein chains: 1

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Short transient receptor potential channel 3	A, B, C, D	820	Homo sapiens	Mutation(s): 1 Gene Names: TRPC3, TRP3
UniProt & NIH Common Fund Data Resources
Find proteins for Q13507 (Homo sapiens) Explore Q13507 Go to UniProtKB: Q13507
PHAROS: Q13507 GTEx: ENSG00000138741
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	Q13507
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
A1CCX Query on A1CCX Download:Ideal Coordinates CCD File SDF format, chain R [auth D] SDF format, chain P [auth C] SDF format, chain L [auth B] SDF format, chain H [auth A] MOL2 format, chain R [auth D] MOL2 format, chain P [auth C] MOL2 format, chain L [auth B] MOL2 format, chain H [auth A] mmCIF format, chain R [auth D] mmCIF format, chain P [auth C] mmCIF format, chain L [auth B] mmCIF format, chain H [auth A]	H [auth A], L [auth B], P [auth C], R [auth D]	(3,4-dihydroisoquinolin-2(1H)-yl)[2-(4-methoxyanilino)-1,3-thiazol-4-yl]methanone C₂₀ H₁₉ N₃ O₂ S NTXBDULODNTCKP-UHFFFAOYSA-N		Interactions Focus chain H [auth A] Focus chain L [auth B] Focus chain P [auth C] Focus chain R [auth D] Interactions & Density Focus chain H [auth A] Focus chain L [auth B] Focus chain P [auth C] Focus chain R [auth D]
UNL( Subject of Investigation/LOI) Query on UNL Download:Ideal Coordinates CCD File	E [auth A] F [auth A] G [auth A] I [auth B] J [auth B] E [auth A], F [auth A], G [auth A], I [auth B], J [auth B], K [auth B], M [auth C], N [auth C], O [auth C], Q [auth D], S [auth D], T [auth D]	Unknown ligand NTXBDULODNTCKP-UHFFFAOYSA-N		Interactions Focus chain E [auth A] Focus chain F [auth A] Focus chain G [auth A] Focus chain I [auth B] Focus chain J [auth B] Focus chain K [auth B] Focus chain M [auth C] Focus chain N [auth C] Focus chain O [auth C] Focus chain Q [auth D] Focus chain S [auth D] Focus chain T [auth D] Interactions & Density Focus chain E [auth A] Focus chain F [auth A] Focus chain G [auth A] Focus chain I [auth B] Focus chain J [auth B] Focus chain K [auth B] Focus chain M [auth C] Focus chain N [auth C] Focus chain O [auth C] Focus chain Q [auth D] Focus chain S [auth D] Focus chain T [auth D]