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- EMDB-27345: cryo-EM structure of TRPM3 ion channel in complex with Gbg in the... -

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Basic information

Entry
Database: EMDB / ID: EMD-27345
Titlecryo-EM structure of TRPM3 ion channel in complex with Gbg in the presence of PIP2, tethered by ALFA-nanobody
Map datamap sharpened by local B-factor in cryoSPARC v2
Sample
  • Complex: TRPM3
    • Protein or peptide: Transient receptor potential cation channel, subfamily M, member 3
    • Protein or peptide: Unidentified segment at the N-terminus of TRPM3
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
  • Ligand: 1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE
  • Ligand: [(2R)-2-octanoyloxy-3-[oxidanyl-[(1R,2R,3S,4R,5R,6S)-2,3,6-tris(oxidanyl)-4,5-diphosphonooxy-cyclohexyl]oxy-phosphoryl]oxy-propyl] octanoate
  • Ligand: (3beta,14beta,17beta,25R)-3-[4-methoxy-3-(methoxymethyl)butoxy]spirost-5-en
  • Ligand: SODIUM ION
KeywordsTRPM3 / ion channel / Gbg / PIP2 / MEMBRANE PROTEIN
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 / Olfactory Signaling Pathway / Activation of the phototransduction cascade / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / G protein-coupled acetylcholine receptor signaling pathway / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through CDC42 / Glucagon signaling in metabolic regulation / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / ADP signalling through P2Y purinoceptor 12 / photoreceptor disc membrane / Sensory perception of sweet, bitter, and umami (glutamate) taste / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / G alpha (z) signalling events / cellular response to catecholamine stimulus / ADORA2B mediated anti-inflammatory cytokines production / ADP signalling through P2Y purinoceptor 1 / G beta:gamma signalling through PI3Kgamma / adenylate cyclase-activating dopamine receptor signaling pathway / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / Inactivation, recovery and regulation of the phototransduction cascade / cellular response to prostaglandin E stimulus / G-protein beta-subunit binding / heterotrimeric G-protein complex / G alpha (12/13) signalling events / sensory perception of taste / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / retina development in camera-type eye / GTPase binding / Ca2+ pathway / fibroblast proliferation / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / G alpha (i) signalling events / protein homotetramerization / G alpha (s) signalling events / phospholipase C-activating G protein-coupled receptor signaling pathway / G alpha (q) signalling events / Ras protein signal transduction / calmodulin binding / Extra-nuclear estrogen signaling / cell population proliferation / G protein-coupled receptor signaling pathway / lysosomal membrane / GTPase activity / synapse / protein-containing complex binding / signal transduction / extracellular exosome / membrane / plasma membrane / cytoplasm / cytosol
Similarity search - Function
TRPM, tetramerisation domain / TRPM, tetramerisation domain superfamily / Tetramerisation domain of TRPM / TRPM, SLOG domain / : / SLOG in TRPM / TRPM2-like domain / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain ...TRPM, tetramerisation domain / TRPM, tetramerisation domain superfamily / Tetramerisation domain of TRPM / TRPM, SLOG domain / : / SLOG in TRPM / TRPM2-like domain / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain / G-protein gamma-like domain superfamily / GGL domain / G protein gamma subunit-like motifs / GGL domain / Ion transport domain / Ion transport protein / G protein beta WD-40 repeat protein / Guanine nucleotide-binding protein, beta subunit / G-protein, beta subunit / G-protein beta WD-40 repeat / WD40 repeat, conserved site / Trp-Asp (WD) repeats signature. / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily
Similarity search - Domain/homology
Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Transient receptor potential cation channel subfamily M member 3
Similarity search - Component
Biological speciesMus musculus (house mouse) / Homo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.8 Å
AuthorsZhao C / MacKinnon R
Funding support United States, 1 items
OrganizationGrant numberCountry
Howard Hughes Medical Institute (HHMI) United States
CitationJournal: Neuron / Year: 2023
Title: Structural and functional analyses of a GPCR-inhibited ion channel TRPM3.
Authors: Chen Zhao / Roderick MacKinnon /
Abstract: G-protein coupled receptors (GPCRs) govern the physiological response to stimuli by modulating the activity of downstream effectors, including ion channels. TRPM3 is an ion channel inhibited by GPCRs ...G-protein coupled receptors (GPCRs) govern the physiological response to stimuli by modulating the activity of downstream effectors, including ion channels. TRPM3 is an ion channel inhibited by GPCRs through direct interaction with G protein (Gβγ) released upon their activation. This GPCR-TRPM3 signaling pathway contributes to the analgesic effect of morphine. Here, we characterized Gβγ inhibition of TRPM3 using electrophysiology and single particle cryo-electron microscopy (cryo-EM). From electrophysiology, we obtained a half inhibition constant (IC50) of ∼240 nM. Using cryo-EM, we determined structures of mouse TRPM3 expressed in human cells with and without Gβγ and with and without PIP, a lipid required for TRPM3 activity, at resolutions of 2.7-4.7 Å. Gβγ-TRPM3 interfaces vary depending on PIP occupancy; however, in all cases, Gβγ appears loosely attached to TRPM3. The IC50 in electrophysiology experiments raises the possibility that additional unknown factors may stabilize the TRPM3-Gβγ complex.
History
DepositionJun 19, 2022-
Header (metadata) releaseNov 2, 2022-
Map releaseNov 2, 2022-
UpdateJun 4, 2025-
Current statusJun 4, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_27345.png

Downloads & links

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Map

FileDownload / File: emd_27345.map.gz / Format: CCP4 / Size: 216 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationmap sharpened by local B-factor in cryoSPARC v2
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
1.08 Å/pix.
x 384 pix.
= 414.72 Å		1.08 Å/pix.
x 384 pix.
= 414.72 Å		1.08 Å/pix.
x 384 pix.
= 414.72 Å

Surface

Projections

Slices (1/3)

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.08 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.012
Minimum - Maximum-0.041435067 - 0.08113891
Average (Standard dev.)0.0001644647 (±0.0018703863)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions384384384
Spacing384384384
CellA=B=C: 414.72003 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: half map 1

Fileemd_27345_half_map_1.map
Annotationhalf map 1
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: half map 2

Fileemd_27345_half_map_2.map
Annotationhalf map 2
Projections & Slices
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Slices (1/2)
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Histogram

Histogram (log scale)

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Sample components

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Entire : TRPM3

EntireName: TRPM3
Components
  • Complex: TRPM3
    • Protein or peptide: Transient receptor potential cation channel, subfamily M, member 3
    • Protein or peptide: Unidentified segment at the N-terminus of TRPM3
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
    • Protein or peptide: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
  • Ligand: 1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE
  • Ligand: [(2R)-2-octanoyloxy-3-[oxidanyl-[(1R,2R,3S,4R,5R,6S)-2,3,6-tris(oxidanyl)-4,5-diphosphonooxy-cyclohexyl]oxy-phosphoryl]oxy-propyl] octanoate
  • Ligand: (3beta,14beta,17beta,25R)-3-[4-methoxy-3-(methoxymethyl)butoxy]spirost-5-en
  • Ligand: SODIUM ION

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Supramolecule #1: TRPM3

SupramoleculeName: TRPM3 / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#4
Source (natural)Organism: Mus musculus (house mouse)

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

MacromoleculeName: Transient receptor potential cation channel, subfamily M, member 3
type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 157.681734 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: GKKWRDAGEL ERGCSDREDS AESRRRSRSA SRGRFAESWK RLSSKQGSTK RSGLPAQQTP AQKSWIERAF YKRECVHIIP STKDPHRCC CGRLIGQHVG LTPSISVLQN EKNESRLSRN DIQSEKWSIS KHTQLSPTDA FGTIEFQGGG HSNKAMYVRV S FDTKPDLL ...String:
GKKWRDAGEL ERGCSDREDS AESRRRSRSA SRGRFAESWK RLSSKQGSTK RSGLPAQQTP AQKSWIERAF YKRECVHIIP STKDPHRCC CGRLIGQHVG LTPSISVLQN EKNESRLSRN DIQSEKWSIS KHTQLSPTDA FGTIEFQGGG HSNKAMYVRV S FDTKPDLL LHLMTKEWQL ELPKLLISVH GGLQNFELQP KLKQVFGKGL IKAAMTTGAW IFTGGVNTGV IRHVGDALKD HA SKSRGKI CTIGIAPWGI VENQEDLIGR DVVRPYQTMS NPMSKLTVLN SMHSHFILAD NGTTGKYGAE VKLRRQLEKH ISL QKINTR IGQGVPVVAL IVEGGPNVIS IVLEYLRDTP PVPVVVCDGS GRASDILAFG HKYSEEGGLI NESLRDQLLV TIQK TFTYT RTQAQHLFII LMECMKKKEL ITVFRMGSEG HQDIDLAILT ALLKGANASA PDQLSLALAW NRVDIARSQI FIYGQ QWPV GSLEQAMLDA LVLDRVDFVK LLIENGVSMH RFLTISRLEE LYNTRHGPSN TLYHLVRDVK KGNLPPDYRI SLIDIG LVI EYLMGGAYRC NYTRKRFRTL YHNLFGPKRP KALKLLGMED DIPLRRGRKT TKKREEEVDI DLDDPEINHF PFPFHEL MV WAVLMKRQKM ALFFWQHGEE AMAKALVACK LCKAMAHEAS ENDMVDDISQ ELNHNSRDFG QLAVELLDQS YKQDEQLA M KLLTYELKNW SNATCLQLAV AAKHRDFIAH TCSQMLLTDM WMGRLRMRKN SGLKVILGIL LPPSILSLEF KNKDDMPYM TQAQEIHLQE KEPEEPEKPT KEKDEEDMEL TAMLGRSNGE SSRKKDEEEV QSRHRLIPVG RKIYEFYNAP IVKFWFYTLA YIGYLMLFN YIVLVKMERW PSTQEWIVIS YIFTLGIEKM REILMSEPGK LLQKVKVWLQ EYWNVTDLIA ILLFSVGMIL R LQDQPFRS DGRVIYCVNI IYWYIRLLDI FGVNKYLGPY VMMIGKMMID MMYFVIIMLV VLMSFGVARQ AILFPNEEPS WK LAKNIFY MPYWMIYGEV FADQIDPPCG QNETREDGKT IQLPPCKTGA WIVPAIMACY LLVANILLVN LLIAVFNNTF FEV KSISNQ VWKFQRYQLI MTFHERPVLP PPLIIFSHMT MIFQHVCCRW RKHESDQDER DYGLKLFITD DELKKVHDFE EQCI EEYFR EKDDRFNSSN DERIRVTSER VENMSMRLEE VNEREHSMKA SLQTVDIRLA QLEDLIGRMA TALERLTGLE RAESN KIRS RTSSDCTDAA YIVRQSSFNS QEGNTFKLQE SIDPAGEETI SPTSPTLMPR MRSHSFYSVN VKDKGGIEKL ESIFKE RSL SLHRATS

UniProtKB: Transient receptor potential cation channel subfamily M member 3

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Macromolecule #2: Unidentified segment at the N-terminus of TRPM3

MacromoleculeName: Unidentified segment at the N-terminus of TRPM3 / type: protein_or_peptide / ID: 2 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 1.464797 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString:
(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)(UNK)(UNK)(UNK)(UNK)(UNK) (UNK)

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Macromolecule #3: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1
type: protein_or_peptide / ID: 3 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 37.41693 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString: MSELDQLRQE AEQLKNQIRD ARKACADATL SQITNNIDPV GRIQMRTRRT LRGHLAKIYA MHWGTDSRLL VSASQDGKLI IWDSYTTNK VHAIPLRSSW VMTCAYAPSG NYVACGGLDN ICSIYNLKTR EGNVRVSREL AGHTGYLSCC RFLDDNQIVT S SGDTTCAL ...String:
MSELDQLRQE AEQLKNQIRD ARKACADATL SQITNNIDPV GRIQMRTRRT LRGHLAKIYA MHWGTDSRLL VSASQDGKLI IWDSYTTNK VHAIPLRSSW VMTCAYAPSG NYVACGGLDN ICSIYNLKTR EGNVRVSREL AGHTGYLSCC RFLDDNQIVT S SGDTTCAL WDIETGQQTT TFTGHTGDVM SLSLAPDTRL FVSGACDASA KLWDVREGMC RQTFTGHESD INAICFFPNG NA FATGSDD ATCRLFDLRA DQELMTYSHD NIICGITSVS FSKSGRLLLA GYDDFNCNVW DALKADRAGV LAGHDNRVSC LGV TDDGMA VATGSWDSFL KIWN

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1

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Macromolecule #4: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

MacromoleculeName: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
type: protein_or_peptide / ID: 4 / Number of copies: 1 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 7.713882 KDa
Recombinant expressionOrganism: Homo sapiens (human)
SequenceString:
ASNNTASIAQ ARKLVEQLKM EANIDRIKVS KAAADLMAYC EAHAKEDPLL TPVPASENPF REKKFFSAIL

UniProtKB: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2

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Macromolecule #5: 1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE

MacromoleculeName: 1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE / type: ligand / ID: 5 / Number of copies: 4 / Formula: 3PH
Molecular weightTheoretical: 704.998 Da
Chemical component information

ChemComp-3PH:
1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE

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Macromolecule #6: [(2R)-2-octanoyloxy-3-[oxidanyl-[(1R,2R,3S,4R,5R,6S)-2,3,6-tris(o...

MacromoleculeName: [(2R)-2-octanoyloxy-3-[oxidanyl-[(1R,2R,3S,4R,5R,6S)-2,3,6-tris(oxidanyl)-4,5-diphosphonooxy-cyclohexyl]oxy-phosphoryl]oxy-propyl] octanoate
type: ligand / ID: 6 / Number of copies: 4 / Formula: PIO
Molecular weightTheoretical: 746.566 Da
Chemical component information

ChemComp-PIO:
[(2R)-2-octanoyloxy-3-[oxidanyl-[(1R,2R,3S,4R,5R,6S)-2,3,6-tris(oxidanyl)-4,5-diphosphonooxy-cyclohexyl]oxy-phosphoryl]oxy-propyl] octanoate

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Macromolecule #7: (3beta,14beta,17beta,25R)-3-[4-methoxy-3-(methoxymethyl)butoxy]sp...

MacromoleculeName: (3beta,14beta,17beta,25R)-3-[4-methoxy-3-(methoxymethyl)butoxy]spirost-5-en
type: ligand / ID: 7 / Number of copies: 4 / Formula: 9Z9
Molecular weightTheoretical: 544.805 Da
Chemical component information

ChemComp-9Z9:
(3beta,14beta,17beta,25R)-3-[4-methoxy-3-(methoxymethyl)butoxy]spirost-5-en / detergent*YM

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Macromolecule #8: SODIUM ION

MacromoleculeName: SODIUM ION / type: ligand / ID: 8 / Number of copies: 1
Molecular weightTheoretical: 22.99 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: 8.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 51.4 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 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: NONE
Final reconstructionApplied symmetry - Point group: C1 (asymmetric) / Resolution.type: BY AUTHOR / Resolution: 3.8 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 47972
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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