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- PDB-6e2g: Cryo-EM structure of rat TRPV6 in complex with Calmodulin -

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Basic information

Entry
Database: PDB / ID: 6e2g
TitleCryo-EM structure of rat TRPV6 in complex with Calmodulin
Components
  • Calmodulin-1
  • Transient receptor potential cation channel subfamily V member 6
KeywordsMEMBRANE PROTEIN / TRPV6 / TRP channels / Calcium channels
Function / homology
Function and homology information


parathyroid hormone secretion / TRP channels / calcium-activated cation channel activity / calcium ion import / CaM pathway / Cam-PDE 1 activation / Sodium/Calcium exchangers / Calmodulin induced events / Reduction of cytosolic Ca++ levels / Activation of Ca-permeable Kainate Receptor ...parathyroid hormone secretion / TRP channels / calcium-activated cation channel activity / calcium ion import / CaM pathway / Cam-PDE 1 activation / Sodium/Calcium exchangers / Calmodulin induced events / Reduction of cytosolic Ca++ levels / Activation of Ca-permeable Kainate Receptor / CREB1 phosphorylation through the activation of CaMKII/CaMKK/CaMKIV cascasde / Loss of phosphorylation of MECP2 at T308 / CREB1 phosphorylation through the activation of Adenylate Cyclase / CaMK IV-mediated phosphorylation of CREB / PKA activation / negative regulation of high voltage-gated calcium channel activity / Glycogen breakdown (glycogenolysis) / CLEC7A (Dectin-1) induces NFAT activation / Activation of RAC1 downstream of NMDARs / negative regulation of ryanodine-sensitive calcium-release channel activity / organelle localization by membrane tethering / mitochondrion-endoplasmic reticulum membrane tethering / autophagosome membrane docking / negative regulation of calcium ion export across plasma membrane / regulation of cardiac muscle cell action potential / presynaptic endocytosis / Synthesis of IP3 and IP4 in the cytosol / regulation of cell communication by electrical coupling involved in cardiac conduction / Phase 0 - rapid depolarisation / calcineurin-mediated signaling / Negative regulation of NMDA receptor-mediated neuronal transmission / Unblocking of NMDA receptors, glutamate binding and activation / RHO GTPases activate PAKs / calcium ion import across plasma membrane / Ion transport by P-type ATPases / Uptake and function of anthrax toxins / regulation of ryanodine-sensitive calcium-release channel activity / Long-term potentiation / protein phosphatase activator activity / Calcineurin activates NFAT / Regulation of MECP2 expression and activity / DARPP-32 events / Smooth Muscle Contraction / detection of calcium ion / catalytic complex / regulation of cardiac muscle contraction / RHO GTPases activate IQGAPs / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / calcium ion homeostasis / cellular response to interferon-beta / Protein methylation / calcium channel inhibitor activity / Activation of AMPK downstream of NMDARs / presynaptic cytosol / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / Ion homeostasis / eNOS activation / titin binding / Tetrahydrobiopterin (BH4) synthesis, recycling, salvage and regulation / sperm midpiece / regulation of calcium-mediated signaling / voltage-gated potassium channel complex / calcium channel complex / FCERI mediated Ca+2 mobilization / substantia nigra development / regulation of heart rate / Ras activation upon Ca2+ influx through NMDA receptor / FCGR3A-mediated IL10 synthesis / Antigen activates B Cell Receptor (BCR) leading to generation of second messengers / calyx of Held / adenylate cyclase activator activity / sarcomere / VEGFR2 mediated cell proliferation / protein serine/threonine kinase activator activity / VEGFR2 mediated vascular permeability / regulation of cytokinesis / spindle microtubule / calcium channel regulator activity / Translocation of SLC2A4 (GLUT4) to the plasma membrane / positive regulation of receptor signaling pathway via JAK-STAT / RAF activation / Transcriptional activation of mitochondrial biogenesis / response to calcium ion / calcium ion transmembrane transport / cellular response to type II interferon / calcium channel activity / Stimuli-sensing channels / G2/M transition of mitotic cell cycle / long-term synaptic potentiation / spindle pole / RAS processing / calcium-dependent protein binding / Signaling by RAF1 mutants / Signaling by moderate kinase activity BRAF mutants / Paradoxical activation of RAF signaling by kinase inactive BRAF / Signaling downstream of RAS mutants / calcium ion transport / Signaling by BRAF and RAF1 fusions / Platelet degranulation / Inactivation, recovery and regulation of the phototransduction cascade
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) / Ankyrin repeat-containing domain / Transient receptor potential cation channel subfamily V / EF-hand / : / Recoverin; domain 1 / EF-hand domain pair / Ankyrin repeats (3 copies) ...Transient receptor potential cation channel subfamily V member 6 / Transient receptor potential cation channel subfamily V member 5/6 / Ankyrin repeats (many copies) / Ankyrin repeat-containing domain / Transient receptor potential cation channel subfamily V / EF-hand / : / Recoverin; domain 1 / EF-hand domain pair / Ankyrin repeats (3 copies) / Ankyrin repeat profile. / Ankyrin repeat region circular profile. / ankyrin repeats / Ankyrin repeat / EF-hand, calcium binding motif / Ankyrin repeat-containing domain superfamily / EF-Hand 1, calcium-binding site / EF-hand calcium-binding domain. / Serine Threonine Protein Phosphatase 5, Tetratricopeptide repeat / EF-hand calcium-binding domain profile. / EF-hand domain / Ion transport domain / Ion transport protein / EF-hand domain pair / Alpha Horseshoe / Orthogonal Bundle / Mainly Alpha
Similarity search - Domain/homology
Calmodulin-1 / Transient receptor potential cation channel subfamily V member 6
Similarity search - Component
Biological speciesRattus norvegicus (Norway rat)
Homo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsSingh, A.K. / McGoldrick, L.L. / Sobolevsky, A.I.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Human Genome Research Institute (NIH/NHGRI)1R01CA206573-01A1 United States
CitationJournal: Sci Adv / Year: 2018
Title: Mechanism of calmodulin inactivation of the calcium-selective TRP channel TRPV6.
Authors: Appu K Singh / Luke L McGoldrick / Edward C Twomey / Alexander I Sobolevsky /
Abstract: Calcium (Ca) plays a major role in numerous physiological processes. Ca homeostasis is tightly controlled by ion channels, the aberrant regulation of which results in various diseases including ...Calcium (Ca) plays a major role in numerous physiological processes. Ca homeostasis is tightly controlled by ion channels, the aberrant regulation of which results in various diseases including cancers. Calmodulin (CaM)-mediated Ca-induced inactivation is an ion channel regulatory mechanism that protects cells against the toxic effects of Ca overload. We used cryo-electron microscopy to capture the epithelial calcium channel TRPV6 (transient receptor potential vanilloid subfamily member 6) inactivated by CaM. The TRPV6-CaM complex exhibits 1:1 stoichiometry; one TRPV6 tetramer binds both CaM lobes, which adopt a distinct head-to-tail arrangement. The CaM carboxyl-terminal lobe plugs the channel through a unique cation-π interaction by inserting the side chain of lysine K115 into a tetra-tryptophan cage at the pore's intracellular entrance. We propose a mechanism of CaM-mediated Ca-induced inactivation that can be explored for therapeutic design.
History
DepositionJul 11, 2018Deposition site: RCSB / Processing site: RCSB
Revision 1.0Aug 22, 2018Provider: repository / Type: Initial release
Revision 1.0Aug 22, 2018Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
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Revision 1.0Aug 22, 2018Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Aug 22, 2018Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.0Aug 22, 2018Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Aug 22, 2018Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Aug 22, 2018Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.0Aug 22, 2018Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0Aug 22, 2018Data content type: Image / Data content type: Image / Provider: repository / Type: Initial release
Revision 1.0Aug 22, 2018Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Oct 24, 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.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.identifier_ORCID
Revision 1.2Dec 18, 2019Group: Author supporting evidence / Other / Category: atom_sites / pdbx_audit_support
Item: _atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] ..._atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] / _atom_sites.fract_transf_matrix[3][3] / _pdbx_audit_support.funding_organization
Revision 1.3Mar 13, 2024Group: Data collection / Database references / Derived calculations
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / struct_conn
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_comp_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_asym_id / _struct_conn.ptnr1_label_atom_id / _struct_conn.ptnr1_label_comp_id / _struct_conn.ptnr1_label_seq_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_comp_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id / _struct_conn.ptnr2_label_atom_id / _struct_conn.ptnr2_label_comp_id / _struct_conn.ptnr2_label_seq_id
Revision 1.4Jun 4, 2025Group: Data collection / Structure summary / Category: em_admin / em_software / pdbx_entry_details / Item: _em_admin.last_update / _em_software.name
Revision 1.1Jun 4, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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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
E: Calmodulin-1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)350,39111
Polymers350,1505
Non-polymers2406
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: 83324.484 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
#2: Protein Calmodulin-1


Mass: 16852.545 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: CALM1, CALM, CAM, CAM1 / Production host: Escherichia coli K-12 (bacteria) / References: UniProt: P0DP23
#3: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: Ca
Has protein modificationN

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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-Calmodulin / Type: COMPLEX / Entity ID: #1-#2 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
Buffer component
IDConc.NameFormulaBuffer-ID
1150 mMsodium chlorideNaCl1
220 mMTRISTRIS1
31
SpecimenConc.: 0.6 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: unidentified
VitrificationCryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 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: SPOT SCAN
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 47 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.12_2829: / Classification: refinement
EM software
IDNameCategory
1RELIONparticle selection
2MotionCorr2particle selection
3cryoSPARCparticle selection
4Leginonimage acquisition
11PHENIXmodel refinement
15cryoSPARC3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 507249
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 111593 / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingSpace: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0121570
ELECTRON MICROSCOPYf_angle_d1.18329262
ELECTRON MICROSCOPYf_dihedral_angle_d11.10712869
ELECTRON MICROSCOPYf_chiral_restr0.0643321
ELECTRON MICROSCOPYf_plane_restr0.0073721

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