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- PDB-6c70: Cryo-EM structure of Orco -

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Basic information

Entry
Database: PDB / ID: 6c70
TitleCryo-EM structure of Orco
ComponentsOdorant receptor
KeywordsMEMBRANE PROTEIN / Olfactory receptor / Ion channel / Insect / Fab
Function / homologyOlfactory receptor, insect / 7tm Odorant receptor / olfactory receptor activity / odorant binding / membrane => GO:0016020 / signal transduction / identical protein binding / plasma membrane / Odorant receptor
Function and homology information
Biological speciesApocrypta bakeri (insect)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å
AuthorsButterwick, J.A. / Kim, K.H. / Walz, T. / Ruta, V.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)R01-AI103171 United States
CitationJournal: Nature / Year: 2018
Title: Cryo-EM structure of the insect olfactory receptor Orco.
Authors: Joel A Butterwick / Josefina Del Mármol / Kelly H Kim / Martha A Kahlson / Jackson A Rogow / Thomas Walz / Vanessa Ruta /
Abstract: The olfactory system must recognize and discriminate amongst an enormous variety of chemicals in the environment. To contend with such diversity, insects have evolved a family of odorant-gated ion ...The olfactory system must recognize and discriminate amongst an enormous variety of chemicals in the environment. To contend with such diversity, insects have evolved a family of odorant-gated ion channels comprised of a highly conserved co-receptor (Orco) and a divergent odorant receptor (OR) that confers chemical specificity. Here, we present the single-particle cryo-electron microscopy structure of an Orco homomer from the parasitic fig wasp Apocrypta bakeri at 3.5 Å resolution, providing structural insight into this receptor family. Orco possesses a novel channel architecture, with four subunits symmetrically arranged around a central pore that diverges into four lateral conduits that open to the cytosol. The Orco tetramer has few inter-subunit interactions within the membrane and is bound together by a small cytoplasmic anchor domain. The minimal sequence conservation among ORs maps largely to the pore and anchor domain, shedding light on how the architecture of this receptor family accommodates its remarkable sequence diversity and facilitates the evolution of odour tuning.
History
DepositionJan 19, 2018Deposition site: RCSB / Processing site: RCSB
Revision 1.0Aug 22, 2018Provider: repository / Type: Initial release
Revision 1.1Aug 29, 2018Group: Data collection / Database references / Category: citation / citation_author
Item: _citation.pdbx_database_id_PubMed / _citation.title / _citation_author.name
Revision 1.2Sep 5, 2018Group: Data collection / Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.3Dec 18, 2019Group: Author supporting evidence / Category: pdbx_audit_support / Item: _pdbx_audit_support.funding_organization
Revision 1.4Mar 13, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

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Assembly

Deposited unit
A: Odorant receptor
B: Odorant receptor
C: Odorant receptor
D: Odorant receptor


Theoretical massNumber of molelcules
Total (without water)214,0534
Polymers214,0534
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: cross-linking
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area9970 Å2
ΔGint-57 kcal/mol
Surface area66450 Å2
MethodPISA

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Components

#1: Protein
Odorant receptor


Mass: 53513.238 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Apocrypta bakeri (insect) / Gene: Or2 / Production host: Homo sapiens (human) / References: UniProt: B0FAQ4

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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: Orco homotetramer bound to four Fab molecules in a detergent micelle
Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Apocrypta bakeri (insect)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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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 FIELDBright-field microscopy
Image recordingAverage exposure time: 0.2 sec. / Electron dose: 80 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of grids imaged: 1221 / Num. of real images: 53141
Image scansMovie frames/image: 50 / Used frames/image: 1-50

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Processing

Software
NameVersionClassificationNB
PHENIX1.13_2998:refinement
PDB_EXTRACT3.22data extraction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 53141 / Symmetry type: POINT
Displacement parametersBiso max: 151.29 Å2 / Biso mean: 108.3876 Å2 / Biso min: 30 Å2
Refinement stepCycle: LAST
ProteinNucleic acidLigandSolventTotal
Num. atoms12528 0 0 0 12528
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0112668
ELECTRON MICROSCOPYf_angle_d1.07117172
ELECTRON MICROSCOPYf_dihedral_angle_d7.847416
ELECTRON MICROSCOPYf_chiral_restr0.0572008
ELECTRON MICROSCOPYf_plane_restr0.0072080

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