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- PDB-9b28: Cryo-EM structure of the mouse TRPM3 alpha 2 channel in complex w... -

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Basic information

Entry
Database: PDB / ID: 9b28
TitleCryo-EM structure of the mouse TRPM3 alpha 2 channel in complex with primidone
ComponentsTransient receptor potential cation channel, subfamily M, member 3
KeywordsTRANSPORT PROTEIN / Transient receptor potential channel / TRPM3 / neurosteroid / pregnenolone sulfate / neurodevelopmental disorders / anticonvulsant / primidone / neurological disorders / nociception / analgesic
Function / homology
Function and homology information


zinc ion transmembrane transporter activity / zinc ion transmembrane transport / temperature-gated ion channel activity / sodium ion transport / monoatomic cation transport / monoatomic cation channel activity / phosphatidylinositol-4,5-bisphosphate binding / calcium ion transmembrane transport / calcium channel activity / G-protein beta/gamma-subunit complex binding ...zinc ion transmembrane transporter activity / zinc ion transmembrane transport / temperature-gated ion channel activity / sodium ion transport / monoatomic cation transport / monoatomic cation channel activity / phosphatidylinositol-4,5-bisphosphate binding / calcium ion transmembrane transport / calcium channel activity / G-protein beta/gamma-subunit complex binding / protein homotetramerization / calmodulin binding / plasma membrane
Similarity search - Function
TRPM, tetramerisation domain / TRPM, tetramerisation domain superfamily / Tetramerisation domain of TRPM / TRPM, SLOG domain / : / SLOG in TRPM / Ion transport domain / Ion transport protein
Similarity search - Domain/homology
Chem-6OU / : / CHOLESTEROL HEMISUCCINATE / Transient receptor potential cation channel subfamily M member 3
Similarity search - Component
Biological speciesMus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.24 Å
AuthorsYin, Y. / Park, C.G. / Feng, S. / Zhang, F. / Guan, Z. / Sharma, K. / Borgnia, M.J. / Im, W. / Lee, S.-Y.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS) United States
CitationJournal: Nat Struct Mol Biol / Year: 2025
Title: Molecular basis of neurosteroid and anticonvulsant regulation of TRPM3.
Authors: Ying Yin / Cheon-Gyu Park / Shasha Feng / Ziqiang Guan / Hyuk-Joon Lee / Feng Zhang / Kedar Sharma / Mario J Borgnia / Wonpil Im / Seok-Yong Lee /
Abstract: Transient receptor potential channel subfamily M member 3 (TRPM3) is a Ca-permeable cation channel activated by the neurosteroid pregnenolone sulfate (PregS) or heat, serving as a nociceptor in the ...Transient receptor potential channel subfamily M member 3 (TRPM3) is a Ca-permeable cation channel activated by the neurosteroid pregnenolone sulfate (PregS) or heat, serving as a nociceptor in the peripheral sensory system. Recent discoveries of autosomal dominant neurodevelopmental disorders caused by gain-of-function mutations in TRPM3 highlight its role in the central nervous system. Notably, the TRPM3 inhibitor primidone, an anticonvulsant, has proven effective in treating patients with TRPM3-linked neurological disorders and in mouse models of thermal nociception. However, our understanding of neurosteroids, inhibitors and disease mutations on TRPM3 is limited. Here we present cryogenic electron microscopy structures of the mouse TRPM3 in complex with cholesteryl hemisuccinate, primidone and PregS with the synthetic agonist CIM 0216. Our studies identify the binding sites for the neurosteroid, synthetic agonist and inhibitor and offer insights into their effects and disease mutations on TRPM3 gating, aiding future drug development.
History
DepositionMar 14, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 22, 2025Provider: repository / Type: Initial release
Revision 1.1Jan 29, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _em_admin.last_update
Revision 1.2May 28, 2025Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Transient receptor potential cation channel, subfamily M, member 3
C: Transient receptor potential cation channel, subfamily M, member 3
B: Transient receptor potential cation channel, subfamily M, member 3
D: Transient receptor potential cation channel, subfamily M, member 3
hetero molecules


Theoretical massNumber of molelcules
Total (without water)802,33620
Polymers794,6974
Non-polymers7,63916
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Transient receptor potential cation channel, subfamily M, member 3


Mass: 198674.297 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Gene: Trpm3 / Production host: Homo sapiens (human) / References: UniProt: Q5F4S7
#2: Chemical
ChemComp-Y01 / CHOLESTEROL HEMISUCCINATE


Mass: 486.726 Da / Num. of mol.: 8 / Source method: obtained synthetically / Formula: C31H50O4
#3: Chemical
ChemComp-6OU / [(2~{R})-1-[2-azanylethoxy(oxidanyl)phosphoryl]oxy-3-hexadecanoyloxy-propan-2-yl] (~{Z})-octadec-9-enoate


Mass: 717.996 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C39H76NO8P / Comment: phospholipid*YM
#4: Chemical
ChemComp-A1AIA / primidone / 5-ethyl-5-phenyl-1,3-diazinane-4,6-dione


Mass: 218.252 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C12H14N2O2
Has ligand of interestY
Has protein modificationY

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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: Transient receptor potential cation channel subfamily M member 3
Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Mus musculus (house mouse)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 293.15 K

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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: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 81000 X / Nominal defocus max: 2750 nm / Nominal defocus min: 1250 nm / Cs: 2.7 mm / C2 aperture diameter: 100 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 5493
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV

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Processing

SoftwareName: PHENIX / Version: 1.20.1_4487: / Classification: refinement
EM software
IDNameCategory
1RELIONparticle selection
2Latitudeimage acquisition
4GctfCTF correction
5RELIONCTF correction
8Cootmodel fitting
10PHENIXmodel refinement
11RELIONinitial Euler assignment
12cryoSPARCfinal Euler assignment
14cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 2418314
SymmetryPoint symmetry: C4 (4 fold cyclic)
3D reconstructionResolution: 3.24 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 104425 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
Atomic model buildingPDB-ID: 6BPQ

6bpq


Accession code: 6BPQ / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00327464
ELECTRON MICROSCOPYf_angle_d0.55837468
ELECTRON MICROSCOPYf_dihedral_angle_d11.699000
ELECTRON MICROSCOPYf_chiral_restr0.0384380
ELECTRON MICROSCOPYf_plane_restr0.0034740

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