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- PDB-6bob: Cryo-EM structure of rat TRPV6* in nanodiscs -

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Basic information

Entry
Database: PDB / ID: 6bob
TitleCryo-EM structure of rat TRPV6* in nanodiscs
ComponentsTransient receptor potential cation channel subfamily V member 6
KeywordsTRANSPORT PROTEIN / Ion channel / Membrane protein
Function / homology
Function and homology information


parathyroid hormone secretion / TRP channels / calcium-activated cation channel activity / calcium ion import / calcium ion import across plasma membrane / calcium ion homeostasis / calcium channel complex / calcium ion transmembrane transport / calcium channel activity / response to calcium ion ...parathyroid hormone secretion / TRP channels / calcium-activated cation channel activity / calcium ion import / calcium ion import across plasma membrane / calcium ion homeostasis / calcium channel complex / calcium ion transmembrane transport / calcium channel activity / response to calcium ion / calcium ion transport / protein homotetramerization / calmodulin binding / apical plasma membrane / identical protein binding / metal ion binding / plasma membrane
Similarity search - Function
Transient receptor potential cation channel subfamily V member 6 / Transient receptor potential cation channel subfamily V member 5/6 / Ankyrin repeats (many copies) / Transient receptor potential cation channel subfamily V / Ankyrin repeats (3 copies) / Ankyrin repeat profile. / Ankyrin repeat region circular profile. / ankyrin repeats / Ankyrin repeat / Ankyrin repeat-containing domain superfamily ...Transient receptor potential cation channel subfamily V member 6 / Transient receptor potential cation channel subfamily V member 5/6 / Ankyrin repeats (many copies) / Transient receptor potential cation channel subfamily V / Ankyrin repeats (3 copies) / Ankyrin repeat profile. / Ankyrin repeat region circular profile. / ankyrin repeats / Ankyrin repeat / Ankyrin repeat-containing domain superfamily / Ion transport domain / Ion transport protein
Similarity search - Domain/homology
Transient receptor potential cation channel subfamily V member 6
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.9 Å
AuthorsMcGoldrick, L.L. / Singh, A.K. / Saotome, K. / Yelshanskaya, M.V. / Twomey, E.C. / Grassucci, R.A. / Sobolevsky, A.I.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Cancer Institute (NIH/NCI)1R01CA206573-01A1 United States
CitationJournal: Nature / Year: 2018
Title: Opening of the human epithelial calcium channel TRPV6.
Authors: Luke L McGoldrick / Appu K Singh / Kei Saotome / Maria V Yelshanskaya / Edward C Twomey / Robert A Grassucci / Alexander I Sobolevsky /
Abstract: Calcium-selective transient receptor potential vanilloid subfamily member 6 (TRPV6) channels play a critical role in calcium uptake in epithelial tissues. Altered TRPV6 expression is associated with ...Calcium-selective transient receptor potential vanilloid subfamily member 6 (TRPV6) channels play a critical role in calcium uptake in epithelial tissues. Altered TRPV6 expression is associated with a variety of human diseases, including cancers. TRPV6 channels are constitutively active and their open probability depends on the lipidic composition of the membrane in which they reside; it increases substantially in the presence of phosphatidylinositol 4,5-bisphosphate. Crystal structures of detergent-solubilized rat TRPV6 in the closed state have previously been solved. Corroborating electrophysiological results, these structures demonstrated that the Ca selectivity of TRPV6 arises from a ring of aspartate side chains in the selectivity filter that binds Ca tightly. However, how TRPV6 channels open and close their pores for ion permeation has remained unclear. Here we present cryo-electron microscopy structures of human TRPV6 in the open and closed states. The channel selectivity filter adopts similar conformations in both states, consistent with its explicit role in ion permeation. The iris-like channel opening is accompanied by an α-to-π-helical transition in the pore-lining transmembrane helix S6 at an alanine hinge just below the selectivity filter. As a result of this transition, the S6 helices bend and rotate, exposing different residues to the ion channel pore in the open and closed states. This gating mechanism, which defines the constitutive activity of TRPV6, is, to our knowledge, unique among tetrameric ion channels and provides structural insights for understanding their diverse roles in physiology and disease.
History
DepositionNov 18, 2017Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 20, 2017Provider: repository / Type: Initial release
Revision 1.1Jan 3, 2018Group: Database references / Category: citation / Item: _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Jan 17, 2018Group: Author supporting evidence / Category: pdbx_audit_support / Item: _pdbx_audit_support.funding_organization
Revision 1.3Jan 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 1.4Dec 4, 2019Group: Author supporting evidence / Category: pdbx_audit_support / Item: _pdbx_audit_support.funding_organization
Revision 1.5Dec 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]
Revision 1.6Mar 13, 2024Group: Data collection / Database references
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / pdbx_database_related
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession / _pdbx_database_related.content_type

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Structure visualization

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Assembly

Deposited unit
A: Transient receptor potential cation channel subfamily V member 6
B: Transient receptor potential cation channel subfamily V member 6
C: Transient receptor potential cation channel subfamily V member 6
D: Transient receptor potential cation channel subfamily V member 6


Theoretical massNumber of molelcules
Total (without water)308,5344
Polymers308,5344
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Transient receptor potential cation channel subfamily V member 6 / TrpV6 / Calcium transport protein 1 / CaT1 / Epithelial calcium channel 2 / ECaC2


Mass: 77133.492 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat) / Gene: Trpv6 / Production host: Homo sapiens (human) / References: UniProt: Q9R186

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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: TRPV6* ion channel in closed states / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Rattus norvegicus (Norway rat)
Source (recombinant)Organism: HEK-293 cells
Buffer solutionpH: 8 / Details: TRIS, NaCl,
Buffer component
IDConc.FormulaBuffer-ID
150TRIS1
2150NaCl1
SpecimenConc.: 0.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid type: C-flat-1.2/1.3
VitrificationCryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K

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Electron microscopy imaging

Experimental equipment
Model: Tecnai F30 / Image courtesy: FEI Company
MicroscopyModel: FEI TECNAI F30
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: SPOT SCAN
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 67 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k)
Image scansMovie frames/image: 40

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Processing

SoftwareName: PHENIX / Version: 1.11.1_2575: / Classification: refinement
EM softwareName: RELION / Category: 3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 248836
3D reconstructionResolution: 3.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 20808 / Symmetry type: POINT
Atomic model buildingProtocol: OTHER / Space: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00719788
ELECTRON MICROSCOPYf_angle_d1.1426868
ELECTRON MICROSCOPYf_dihedral_angle_d10.59711780
ELECTRON MICROSCOPYf_chiral_restr0.063056
ELECTRON MICROSCOPYf_plane_restr0.0073396

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