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- PDB-6bwd: 3.7 angstrom cryoEM structure of truncated mouse TRPM7 -

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Basic information

Entry
Database: PDB / ID: 6bwd
Title3.7 angstrom cryoEM structure of truncated mouse TRPM7
ComponentsTransient receptor potential cation channel subfamily M member 7
KeywordsMEMBRANE PROTEIN / CryoEM / Truncated mouse TRPM7
Function / homology
Function and homology information


intracellular magnesium ion homeostasis / calcium-dependent cell-matrix adhesion / varicosity / TRP channels / actomyosin structure organization / myosin binding / monoatomic cation transmembrane transport / necroptotic process / monoatomic cation channel activity / ruffle ...intracellular magnesium ion homeostasis / calcium-dependent cell-matrix adhesion / varicosity / TRP channels / actomyosin structure organization / myosin binding / monoatomic cation transmembrane transport / necroptotic process / monoatomic cation channel activity / ruffle / protein tetramerization / calcium channel activity / memory / synaptic vesicle membrane / calcium ion transport / actin binding / kinase activity / non-specific serine/threonine protein kinase / protein kinase activity / positive regulation of apoptotic process / phosphorylation / protein serine kinase activity / protein serine/threonine kinase activity / neuronal cell body / ATP binding / metal ion binding / plasma membrane
Similarity search - Function
Transient receptor potential cation channel subfamily M member 7 / MHCK/EF2 kinase / Alpha-kinase family / Alpha-type protein kinase domain profile. / Alpha-kinase family / TRPM, tetramerisation domain / TRPM, tetramerisation domain superfamily / Tetramerisation domain of TRPM / TRPM, SLOG domain / SLOG in TRPM ...Transient receptor potential cation channel subfamily M member 7 / MHCK/EF2 kinase / Alpha-kinase family / Alpha-type protein kinase domain profile. / Alpha-kinase family / TRPM, tetramerisation domain / TRPM, tetramerisation domain superfamily / Tetramerisation domain of TRPM / TRPM, SLOG domain / SLOG in TRPM / Ion transport domain / Ion transport protein / Protein kinase-like domain superfamily
Similarity search - Domain/homology
CHOLESTEROL HEMISUCCINATE / Transient receptor potential cation channel subfamily M member 7
Similarity search - Component
Biological speciesMus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.7 Å
AuthorsZhang, J. / Li, Z. / Duan, J. / Li, J. / Hulse, R.E. / Santa-Cruz, A. / Abiria, S.A. / Krapivinsky, G. / Clapham, D.E.
CitationJournal: Proc Natl Acad Sci U S A / Year: 2018
Title: Structure of the mammalian TRPM7, a magnesium channel required during embryonic development.
Authors: Jingjing Duan / Zongli Li / Jian Li / Raymond E Hulse / Ana Santa-Cruz / William C Valinsky / Sunday A Abiria / Grigory Krapivinsky / Jin Zhang / David E Clapham /
Abstract: The transient receptor potential ion channel subfamily M, member 7 (TRPM7), is a ubiquitously expressed protein that is required for mouse embryonic development. TRPM7 contains both an ion channel ...The transient receptor potential ion channel subfamily M, member 7 (TRPM7), is a ubiquitously expressed protein that is required for mouse embryonic development. TRPM7 contains both an ion channel and an α-kinase. The channel domain comprises a nonselective cation channel with notable permeability to Mg and Zn Here, we report the closed state structures of the mouse TRPM7 channel domain in three different ionic conditions to overall resolutions of 3.3, 3.7, and 4.1 Å. The structures reveal key residues for an ion binding site in the selectivity filter, with proposed partially hydrated Mg ions occupying the center of the conduction pore. In high [Mg], a prominent external disulfide bond is found in the pore helix, which is essential for ion channel function. Our results provide a structural framework for understanding the TRPM1/3/6/7 subfamily and extend the knowledge base upon which to study the diversity and evolution of TRP channels.
History
DepositionDec 14, 2017Deposition site: RCSB / Processing site: RCSB
Revision 1.0Aug 15, 2018Provider: repository / Type: Initial release
Revision 1.1Aug 29, 2018Group: Data collection / Database references / Category: citation / citation_author
Item: _citation.journal_abbrev / _citation.pdbx_database_id_PubMed ..._citation.journal_abbrev / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.name
Revision 1.2Sep 5, 2018Group: Data collection / Database references / Category: citation / citation_author
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _citation_author.identifier_ORCID
Revision 1.3Dec 18, 2019Group: Other / Category: atom_sites
Item: _atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] / _atom_sites.fract_transf_matrix[3][3]

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Assembly

Deposited unit
A: Transient receptor potential cation channel subfamily M member 7
B: Transient receptor potential cation channel subfamily M member 7
C: Transient receptor potential cation channel subfamily M member 7
D: Transient receptor potential cation channel subfamily M member 7
hetero molecules


Theoretical massNumber of molelcules
Total (without water)440,09929
Polymers430,2434
Non-polymers9,85625
Water54030
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: assay for oligomerization
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Transient receptor potential cation channel subfamily M member 7 / Channel-kinase 1 / Long transient receptor potential channel 7 / LTrpC7 / Transient receptor ...Channel-kinase 1 / Long transient receptor potential channel 7 / LTrpC7 / Transient receptor potential-phospholipase C-interacting kinase / TRP-PLIK


Mass: 107560.719 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q923J1*PLUS
#2: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: Mg
#3: Chemical
ChemComp-Y01 / CHOLESTEROL HEMISUCCINATE


Mass: 486.726 Da / Num. of mol.: 20 / Source method: obtained synthetically / Formula: C31H50O4
#4: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 30 / Source method: isolated from a natural source / Formula: H2O
Sequence detailsThe full sample sequence is MSQKSWIESTLTKRECVYIIPSSKDPHRCLPGCQICQQLVRCFCGRLVKQHACFTASLAMKYSDV ...The full sample sequence is MSQKSWIESTLTKRECVYIIPSSKDPHRCLPGCQICQQLVRCFCGRLVKQHACFTASLAMKYSDV KLGEHFNQAIEEWSVEKHTEQSPTDAYGVINFQGGSHSYRAKYVRLSYDTKPEIILQLLLKEWQM ELPKLVISVHGGMQKFELHPRIKQLLGKGLIKAAVTTGAWILTGGVNTGVAKHVGDALKEHASRS SRKICTIGIAPWGVIENRNDLVGRDVVAPYQTLLNPLSKLNVLNNLHSHFILVDDGTVGKYGAEV RLRRELEKTINQQRIHARIGQGVPVVALIFEGGPNVILTVLEYLQESPPVPVVVCEGTGRAADLL AYIHKQTEEGGNLPDAAEPDIISTIKKTFNFGQSEAVHLFQTMMECMKKKELITVFHIGSEDHQD IDVAILTALLKGTNASAFDQLILTLAWDRVDIAKNHVFVYGQQWLVGSLEQAMLDALVMDRVSFV KLLIENGVSMHKFLTIPRLEELYNTKQGPTNPMLFHLIRDVKQGNLPPGYKITLIDIGLVIEYLM GGTYRCTYTRKRFRLIYNSLGGNNRRSGRNTSSSTPQLRKSHETFGNRADKKEKMRHNHFIKTAQ PYRPKMDASMEEGKKKRTKDEIVDIDDPETKRFPYPLNELLIWACLMKRQVMARFLWQHGEESMA KALVACKIYRSMAYEAKQSDLVDDTSEELKQYSNDFGQLAVELLEQSFRQDETMAMKLLTYELKN WSNSTCLKLAVSSRLRPFVAHTCTQMLLSDMWMGRLNMRKNSWYKVILSILVPPAILMLEYKTKA EMSHIPQSQDAHQMTMEDSENNFHNITEEIPMEVFKEVKILDSSDGKNEMEIHIKSKKLPITRKF YAFYHAPIVKFWFNTLAYLGFLMLYTFVVLVKMEQLPSVQEWIVIAYIFTYAIEKVREVFMSEAG KISQKIKVWFSDYFNVSDTIAIISFFVGFGLRFGAKWNYINAYDNHVFVAGRLIYCLNIIFWYVR LLDFLAVNQQAGPYVMMIGKMVANMFYIVVIMALVLLSFGVPRKAILYPHEEPSWSLAKDIVFHP YWMIFGEVYAYEIDVCANDSTLPTICGPGTWLTPFLQAVYLFVQYIIMVNLLIAFFNNVYLQVKA ISNIVWKYQRYHFIMAYHEKPVLPPPLIILSHIVSLFCCVCKRRKKDKTSDGPKLFLTEEDQKKL HDFEEQCVEMYFDEKDDKFNSGSEERIRVTFERVEQMSIQIKEVGDRVNYIKRSLQSLDSQIGHL QDLSALTVDTLKTLTAQKASEASKVHNEITRELSISKHLAQNLIDDVPVRPLWKKPSAVNTLSSS

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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: Truncated mouse TRPM7 with Mg2+ / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Mus musculus (house mouse)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK I / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 20 K

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Electron microscopy imaging

Experimental equipment
Model: Tecnai Polara / Image courtesy: FEI Company
MicroscopyModel: FEI POLARA 300
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 56 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.11.1_2575: / Classification: refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 232930 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.01323663
ELECTRON MICROSCOPYf_angle_d1.64632268
ELECTRON MICROSCOPYf_dihedral_angle_d13.47315070
ELECTRON MICROSCOPYf_chiral_restr0.093819
ELECTRON MICROSCOPYf_plane_restr0.0093985

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