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- EMDB-57866: Human Trpm4 with calcium at 37 degrees celsius -

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Basic information

Entry
Database: EMDB / ID: EMD-57866
TitleHuman Trpm4 with calcium at 37 degrees celsius
Map data
Sample
  • Complex: Human Trpm4
    • Protein or peptide: Transient receptor potential cation channel subfamily M member 4
  • Ligand: CALCIUM ION
KeywordsTRP channel / ion channel / MEMBRANE PROTEIN
Function / homology
Function and homology information


positive regulation of atrial cardiac muscle cell action potential / positive regulation of regulation of vascular associated smooth muscle cell membrane depolarization / sodium channel complex / regulation of T cell cytokine production / membrane depolarization during AV node cell action potential / membrane depolarization during bundle of His cell action potential / negative regulation of bone mineralization / membrane depolarization during Purkinje myocyte cell action potential / metal ion transport / regulation of ventricular cardiac muscle cell action potential ...positive regulation of atrial cardiac muscle cell action potential / positive regulation of regulation of vascular associated smooth muscle cell membrane depolarization / sodium channel complex / regulation of T cell cytokine production / membrane depolarization during AV node cell action potential / membrane depolarization during bundle of His cell action potential / negative regulation of bone mineralization / membrane depolarization during Purkinje myocyte cell action potential / metal ion transport / regulation of ventricular cardiac muscle cell action potential / calcium-activated cation channel activity / sodium ion import across plasma membrane / : / dendritic cell chemotaxis / TRP channels / sodium channel activity / cellular response to ATP / regulation of heart rate by cardiac conduction / monoatomic cation transmembrane transport / protein sumoylation / positive regulation of vasoconstriction / negative regulation of osteoblast differentiation / positive regulation of fat cell differentiation / positive regulation of heart rate / positive regulation of adipose tissue development / positive regulation of insulin secretion involved in cellular response to glucose stimulus / calcium-mediated signaling / calcium ion transmembrane transport / calcium channel activity / Sensory perception of sweet, bitter, and umami (glutamate) taste / positive regulation of canonical Wnt signaling pathway / positive regulation of cytosolic calcium ion concentration / protein homotetramerization / adaptive immune response / calmodulin binding / neuronal cell body / calcium ion binding / positive regulation of cell population proliferation / endoplasmic reticulum / Golgi apparatus / nucleoplasm / ATP binding / membrane / identical protein binding / plasma membrane
Similarity search - Function
TRPM, SLOG domain / : / : / SLOG in TRPM / TRPM2-like domain / Ion transport domain / Ion transport protein
Similarity search - Domain/homology
Transient receptor potential cation channel subfamily M member 4
Similarity search - Component
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.0 Å
AuthorsSchneiter D / Ekundayo BE / Stahlberg H / Abriel H
Funding support Switzerland, 1 items
OrganizationGrant numberCountry
Swiss National Science Foundation215274 Switzerland
CitationJournal: bioRxiv / Year: 2026
Title: Temperature-dependent ligand relocation reveals plasticity of TRPM4 inhibition.
Authors: Dominic Schneiter / Jean-Sébastien Rougier / Hugues Abriel / Henning Stahlberg / Babatunde Ekundayo
Abstract: Transient receptor potential melastatin 4 (TRPM4) is a Ca²⁺-activated cation channel whose pharmacology is shaped by its molecular environment. It remains poorly understood how temperature and ...Transient receptor potential melastatin 4 (TRPM4) is a Ca²⁺-activated cation channel whose pharmacology is shaped by its molecular environment. It remains poorly understood how temperature and membrane context influence inhibitor recognition. Here we combine cryo-electron microscopy of membrane-derived vesicles and detergent-solubilized TRPM4 to investigate lipid-associated architecture and binding of the potent anthranilic anilide inhibitor PBA. We find that membrane vesicles preserve a native-like paralipid environment and reveal lipid binding patterns highly similar to those observed in GDN, supporting detergent-solubilized TRPM4 as a structurally relevant system for ligand analysis. Strikingly, PBA occupies distinct binding pockets at 8□°C and 37□°C. At low temperature, PBA binds in a previously described inhibitor pocket formed by S3, S4, the S4-S5 linker and the TRP helix, whereas at physiological temperature it relocates to a distinct site within the S1-S4 domain proximal to the Ca²⁺ regulatory region. These findings reveal temperature-dependent plasticity in TRPM4 ligand recognition.
History
DepositionMay 1, 2026-
Header (metadata) releaseJun 3, 2026-
Map releaseJun 3, 2026-
UpdateJun 3, 2026-
Current statusJun 3, 2026Processing site: PDBe / Status: Released

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Structure visualization

Supplemental images

emd_57866.png

Downloads & links

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Map

FileDownload / File: emd_57866.map.gz / Format: CCP4 / Size: 244.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
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Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.91 Å/pix.
x 400 pix.
= 365.2 Å		0.91 Å/pix.
x 400 pix.
= 365.2 Å		0.91 Å/pix.
x 400 pix.
= 365.2 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 0.913 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.06
Minimum - Maximum-0.16904256 - 0.38218316
Average (Standard dev.)0.00018524728 (±0.010745139)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions400400400
Spacing400400400
CellA=B=C: 365.19998 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_57866_half_map_1.map
Projections & Slices
AxesZYX

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Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_57866_half_map_2.map
Projections & Slices
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Histogram

Histogram (log scale)

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Sample components

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Entire : Human Trpm4

EntireName: Human Trpm4
Components
  • Complex: Human Trpm4
    • Protein or peptide: Transient receptor potential cation channel subfamily M member 4
  • Ligand: CALCIUM ION

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Supramolecule #1: Human Trpm4

SupramoleculeName: Human Trpm4 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Homo sapiens (human)

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Macromolecule #1: Transient receptor potential cation channel subfamily M member 4

MacromoleculeName: Transient receptor potential cation channel subfamily M member 4
type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 134.456484 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MVVPEKEQSW IPKIFKKKTC TTFIVDSTDP GGTLCQCGRP RTAHPAVAME DAFGAAVVTV WDSDAHTTEK PTDAYGELDF TGAGRKHSN FLRLSDRTDP AAVYSLVTRT WGFRAPNLVV SVLGGSGGPV LQTWLQDLLR RGLVRAAQST GAWIVTGGLH T GIGRHVGV ...String:
MVVPEKEQSW IPKIFKKKTC TTFIVDSTDP GGTLCQCGRP RTAHPAVAME DAFGAAVVTV WDSDAHTTEK PTDAYGELDF TGAGRKHSN FLRLSDRTDP AAVYSLVTRT WGFRAPNLVV SVLGGSGGPV LQTWLQDLLR RGLVRAAQST GAWIVTGGLH T GIGRHVGV AVRDHQMAST GGTKVVAMGV APWGVVRNRD TLINPKGSFP ARYRWRGDPE DGVQFPLDYN YSAFFLVDDG TH GCLGGEN RFRLRLESYI SQQKTGVGGT GIDIPVLLLL IDGDEKMLTR IENATQAQLP CLLVAGSGGA ADCLAETLED TLA PGSGGA RQGEARDRIR RFFPKGDLEV LQAQVERIMT RKELLTVYSS EDGSEEFETI VLKALVKACG SSEASAYLDE LRLA VAWNR VDIAQSELFR GDIQWRSFHL EASLMDALLN DRPEFVRLLI SHGLSLGHFL TPMRLAQLYS AAPSNSLIRN LLDQA SHSA GTKAPALKGG AAELRPPDVG HVLRMLLGKM CAPRYPSGGA WDPHPGQGFG ESMYLLSDKA TSPLSLDAGL GQAPWS DLL LWALLLNRAQ MAMYFWEMGS NAVSSALGAC LLLRVMARLE PDAEEAARRK DLAFKFEGMG VDLFGECYRS SEVRAAR LL LRRCPLWGDA TCLQLAMQAD ARAFFAQDGV QSLLTQKWWG DMASTTPIWA LVLAFFCPPL IYTRLITFRK SEEEPTRE E LEFDMDSVIN GEGPVGTADP AEKTPLGVPR QSGRPGCCGG RCGGRRCLRR WFHFWGAPVT IFMGNVVSYL LFLLLFSRV LLVDFQPAPP GSLELLLYFW AFTLLCEELR QGLSGGGGSL ASGGPGPGHA SLSQRLRLYL ADSWNQCDLV ALTCFLLGVG CRLTPGLYH LGRTVLCIDF MVFTVRLLHI FTVNKQLGPK IVIVSKMMKD VFFFLFFLGV WLVAYGVATE GLLRPRDSDF P SILRRVFY RPYLQIFGQI PQEDMDVALM EHSNCSSEPG FWAHPPGAQA GTCVSQYANW LVVLLLVIFL LVANILLVNL LI AMFSYTF GKVQGNSDLY WKAQRYRLIR EFHSRPALAP PFIVISHLRL LLRQLCRRPR SPQPSSPALE HFRVYLSKEA ERK LLTWES VHKENFLLAR ARDKRESDSE RLKRTSQKVD LALKQLGHIR EYEQRLKVLE REVQQCSRVL GWVAEALSRS ALLP PGGPP PPDLPGSKD

UniProtKB: Transient receptor potential cation channel subfamily M member 4

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Macromolecule #2: CALCIUM ION

MacromoleculeName: CALCIUM ION / type: ligand / ID: 2 / Number of copies: 4 / Formula: CA
Molecular weightTheoretical: 40.078 Da

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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: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Image recordingFilm or detector model: TFS FALCON 4i (4k x 4k) / 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 / Nominal defocus max: 2.2 µm / Nominal defocus min: 0.8 µm
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: PDB ENTRY
PDB model - PDB ID:

9b92

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.0 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC / Number images used: 135667
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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Atomic model buiding 1

Initial modelPDB ID:

9b8w


Chain - Source name: PDB / Chain - Initial model type: experimental model
Output model

PDB-30la:
Human Trpm4 with calcium at 37 degrees celsius

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