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- PDB-6bqr: Human TRPM4 ion channel in lipid nanodiscs in a calcium-free state -

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Entry
Database: PDB / ID: 6bqr
TitleHuman TRPM4 ion channel in lipid nanodiscs in a calcium-free state
ComponentsTransient receptor potential cation channel subfamily M member 4
KeywordsMEMBRANE PROTEIN / TRPM4 / TRPM channel / TRP channel
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 / membrane depolarization during Purkinje myocyte cell action potential / negative regulation of bone mineralization / ligand-gated calcium channel activity / sodium ion import across plasma membrane ...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 / membrane depolarization during Purkinje myocyte cell action potential / negative regulation of bone mineralization / ligand-gated calcium channel activity / sodium ion import across plasma membrane / regulation of ventricular cardiac muscle cell action potential / calcium-activated cation channel activity / inorganic cation transmembrane transport / TRP channels / dendritic cell chemotaxis / sodium channel activity / cellular response to ATP / positive regulation of heart rate / regulation of heart rate by cardiac conduction / positive regulation of insulin secretion involved in cellular response to glucose stimulus / protein sumoylation / positive regulation of fat cell differentiation / negative regulation of osteoblast differentiation / positive regulation of vasoconstriction / positive regulation of adipose tissue development / calcium-mediated signaling / calcium ion transmembrane transport / 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 / positive regulation of cell population proliferation / calcium ion binding / Golgi apparatus / endoplasmic reticulum / nucleoplasm / ATP binding / identical protein binding / membrane / plasma membrane / cytosol
Similarity search - Function
TRPM, SLOG domain / : / SLOG in TRPM / Ion transport domain / Ion transport protein
Similarity search - Domain/homology
CHOLESTEROL HEMISUCCINATE / Transient receptor potential cation channel subfamily M member 4
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsAutzen, H.E. / Myasnikov, A.G. / Campbell, M.G. / Asarnow, D. / Julius, D. / Cheng, Y.
Funding support United States, Denmark, 5items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01GM098672 United States
National Institutes of Health/Office of the DirectorS10OD020054 United States
National Institutes of Health/Office of the DirectorS10OD021741 United States
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)R01NS047723 United States
Danish Council of Independent ResearchDFF-5051-00085 Denmark
CitationJournal: Science / Year: 2018
Title: Structure of the human TRPM4 ion channel in a lipid nanodisc.
Authors: Henriette E Autzen / Alexander G Myasnikov / Melody G Campbell / Daniel Asarnow / David Julius / Yifan Cheng /
Abstract: Transient receptor potential (TRP) melastatin 4 (TRPM4) is a widely expressed cation channel associated with a variety of cardiovascular disorders. TRPM4 is activated by increased intracellular ...Transient receptor potential (TRP) melastatin 4 (TRPM4) is a widely expressed cation channel associated with a variety of cardiovascular disorders. TRPM4 is activated by increased intracellular calcium in a voltage-dependent manner but, unlike many other TRP channels, is permeable to monovalent cations only. Here we present two structures of full-length human TRPM4 embedded in lipid nanodiscs at ~3-angstrom resolution, as determined by single-particle cryo-electron microscopy. These structures, with and without calcium bound, reveal a general architecture for this major subfamily of TRP channels and a well-defined calcium-binding site within the intracellular side of the S1-S4 domain. The structures correspond to two distinct closed states. Calcium binding induces conformational changes that likely prime the channel for voltage-dependent opening.
History
DepositionNov 28, 2017Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 20, 2017Provider: repository / Type: Initial release
Revision 1.1Jan 17, 2018Group: Author supporting evidence / Category: pdbx_audit_support / Item: _pdbx_audit_support.funding_organization
Revision 1.2Jan 24, 2018Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation.year
Revision 1.3Aug 22, 2018Group: Data collection / Database references / Category: pdbx_related_exp_data_set / Item: _pdbx_related_exp_data_set.data_reference
Revision 1.4Dec 18, 2019Group: Author supporting evidence / Category: pdbx_audit_support / Item: _pdbx_audit_support.funding_organization

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Structure visualization

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Assembly

Deposited unit
A: Transient receptor potential cation channel subfamily M member 4
B: Transient receptor potential cation channel subfamily M member 4
C: Transient receptor potential cation channel subfamily M member 4
D: Transient receptor potential cation channel subfamily M member 4
hetero molecules


Theoretical massNumber of molelcules
Total (without water)491,75316
Polymers485,9124
Non-polymers5,84112
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area28160 Å2
ΔGint-237 kcal/mol
Surface area171270 Å2

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Components

#1: Protein
Transient receptor potential cation channel subfamily M member 4 / hTRPM4 / Calcium-activated non-selective cation channel 1 / Long transient receptor potential ...hTRPM4 / Calcium-activated non-selective cation channel 1 / Long transient receptor potential channel 4 / LTrpC4 / Melastatin-4


Mass: 121477.953 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: TRPM4, LTRPC4 / Production host: Homo sapiens (human) / References: UniProt: Q8TD43
#2: Chemical
ChemComp-Y01 / CHOLESTEROL HEMISUCCINATE


Mass: 486.726 Da / Num. of mol.: 12 / Source method: obtained synthetically / Formula: C31H50O4

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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: Human TRPM4 ion channel / Type: COMPLEX
Details: Human TRPM4 ion channel in lipid nanodiscs in a calcium-free state
Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.1346 MDa / Experimental value: YES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
Buffer component
IDConc.NameFormulaBuffer-ID
150 mM4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES), pH 7.4C8H18N2O4S1
2150 mMsodium chlorideNaCl1
35 mMEthylenediaminetetraacetic acid (EDTA)C10H16N2O81
SpecimenConc.: 2.2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 283 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: 22500 X / Nominal defocus max: 1500 nm / Nominal defocus min: 500 nm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 10 sec. / Electron dose: 54 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 1817

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Processing

SoftwareName: PHENIX / Version: 1.11.1_2575: / Classification: refinement
EM software
IDNameVersionCategory
2SerialEMimage acquisition
4GctfCTF correction
9PHENIXmodel refinement
10cryoSPARCinitial Euler assignment
11RELIONfinal Euler assignment
12RELIONclassification
13RELION2.13D reconstruction
Image processingDetails: K2 camera operating in super-resolution counting mode
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 528648 / Details: Automatic picking
SymmetryPoint symmetry: C4 (4 fold cyclic)
3D reconstructionResolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 47242 / Algorithm: FOURIER SPACE / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingProtocol: AB INITIO MODEL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00718172
ELECTRON MICROSCOPYf_angle_d1.10924676
ELECTRON MICROSCOPYf_dihedral_angle_d13.53810612
ELECTRON MICROSCOPYf_chiral_restr0.0542732
ELECTRON MICROSCOPYf_plane_restr0.0083012

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