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- PDB-9cq7: G115 TCR extracellular domain bound to Fab 1 -

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Basic information

Entry
Database: PDB / ID: 9cq7
TitleG115 TCR extracellular domain bound to Fab 1
Components
  • (anti TCR variable delta 2 Fab ...) x 2
  • G115 TCR delta chain
  • G115 TCR gamma chain
KeywordsMEMBRANE PROTEIN/IMMUNE SYSTEM / TCR / CD3 / gamma delta / Fab / OKT3 / immune receptor / T cell / MEMBRANE PROTEIN / MEMBRANE PROTEIN-IMMUNE SYSTEM complex
Biological speciesHomo sapiens (human)
Mus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.21 Å
AuthorsHoque, M. / Saotome, K. / Franklin, M.C.
Funding support United States, 1items
OrganizationGrant numberCountry
Other private United States
CitationJournal: Nat Commun / Year: 2025
Title: Structural characterization of two γδ TCR/CD3 complexes.
Authors: Mohammed Hoque / John Benji Grigg / Trudy Ramlall / Jennifer Jones / Luke L McGoldrick / John C Lin / William C Olson / Eric Smith / Matthew C Franklin / Tong Zhang / Kei Saotome /
Abstract: The T-cell receptor (TCR)/CD3 complex plays an essential role in the immune response and is a key player in cancer immunotherapies. There are two classes of TCR/CD3 complexes, defined by their TCR ...The T-cell receptor (TCR)/CD3 complex plays an essential role in the immune response and is a key player in cancer immunotherapies. There are two classes of TCR/CD3 complexes, defined by their TCR chain usage (αβ or γδ). Recently reported structures have revealed the organization of the αβ TCR/CD3 complex, but similar studies regarding the γδ TCR/CD3 complex have lagged behind. Here, we report cryoelectron microscopy (cryoEM) structural analysis of two γδ TCRs, G115 (Vγ9 Vδ2) and 9C2 (Vγ5 Vδ1), in complex with CD3 subunits. Our results show that the overall subunit organization of the γδ TCR/CD3 complexes is similar to αβ TCRs. However, both γδ TCRs display highly mobile extracellular domains (ECDs), unlike αβ TCRs, which have TCR ECDs that are rigidly coupled to its transmembrane (TM) domains. We corroborate this finding in cells by demonstrating that a γδ T-cell specific antibody can bind a site that would be inaccessible in the more rigid αβ TCR/CD3 complex. Furthermore, we observed that the Vγ5 Vδ1 complex forms a TCR γ5 chain-mediated dimeric species whereby two TCR/CD3 complexes are assembled. Collectively, these data shed light on γδ TCR/CD3 complex formation and may aid the design of γδ TCR-based therapies.
History
DepositionJul 19, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jan 15, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
D: G115 TCR delta chain
G: G115 TCR gamma chain
H: anti TCR variable delta 2 Fab heavy chain
I: anti TCR variable delta 2 Fab light chain
hetero molecules


Theoretical massNumber of molelcules
Total (without water)113,0097
Polymers112,1424
Non-polymers8673
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein , 2 types, 2 molecules DG

#1: Protein G115 TCR delta chain


Mass: 31519.264 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)
#2: Protein G115 TCR gamma chain


Mass: 33349.344 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Production host: Homo sapiens (human)

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Antibody , 2 types, 2 molecules HI

#3: Antibody anti TCR variable delta 2 Fab heavy chain


Mass: 24048.842 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Cricetulus griseus (Chinese hamster)
#4: Antibody anti TCR variable delta 2 Fab light chain


Mass: 23224.613 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Production host: Cricetulus griseus (Chinese hamster)

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Sugars , 2 types, 3 molecules

#5: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#6: Sugar ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Details

Has ligand of interestN
Has protein modificationY

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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: G115 gamma delta TCR/CD3 complex bound by OKT3 Fab / Type: COMPLEX / Entity ID: #1-#4 / Source: MULTIPLE SOURCES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 8
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 FIELD / Nominal defocus max: 2200 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

EM softwareName: PHENIX / Version: 1.21.1_5286 / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.21 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 156210 / Symmetry type: POINT
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 53.98 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00315343
ELECTRON MICROSCOPYf_angle_d0.58917246
ELECTRON MICROSCOPYf_chiral_restr0.0468816
ELECTRON MICROSCOPYf_plane_restr0.0043910
ELECTRON MICROSCOPYf_dihedral_angle_d5.1495733

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