6JXR

Structure of a protein


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.7 Å
  • Aggregation State: CELL 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural basis of assembly of the human T cell receptor-CD3 complex.

Zheng, L.Lin, J.Zhang, B.Zhu, Y.Li, N.Xie, S.Wang, Y.Gao, N.Huang, Z.

(2019) Nature 573: 546-552

  • DOI: 10.1038/s41586-019-1537-0

  • PubMed Abstract: 
  • The αβ T cell receptor (TCR), in association with the CD3γε-CD3δε-CD3ζζ signalling hexamer, is the primary determinant of T cell development and activation, and of immune responses to foreign antigens. The mechanism of assembly of the TCR-CD3 complex ...

    The αβ T cell receptor (TCR), in association with the CD3γε-CD3δε-CD3ζζ signalling hexamer, is the primary determinant of T cell development and activation, and of immune responses to foreign antigens. The mechanism of assembly of the TCR-CD3 complex remains unknown. Here we report a cryo-electron microscopy structure of human TCRαβ in complex with the CD3 hexamer at 3.7 Å resolution. The structure contains the complete extracellular domains and all the transmembrane helices of TCR-CD3. The octameric TCR-CD3 complex is assembled with 1:1:1:1 stoichiometry of TCRαβ:CD3γε:CD3δε:CD3ζζ. Assembly of the extracellular domains of TCR-CD3 is mediated by the constant domains and connecting peptides of TCRαβ that pack against CD3γε-CD3δε, forming a trimer-like structure proximal to the plasma membrane. The transmembrane segment of the CD3 complex adopts a barrel-like structure formed by interaction of the two transmembrane helices of CD3ζζ with those of CD3γε and CD3δε. Insertion of the transmembrane helices of TCRαβ into the barrel-like structure via both hydrophobic and ionic interactions results in transmembrane assembly of the TCR-CD3 complex. Together, our data reveal the structural basis for TCR-CD3 complex assembly, providing clues to TCR triggering and a foundation for rational design of immunotherapies that target the complex.


    Organizational Affiliation

    Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China.,State Key Laboratory of Membrane Biology, Peking-Tsinghua Center for Life Sciences, School of Life Sciences, Peking University, Beijing, China.,State Key Laboratory of Membrane Biology, Peking-Tsinghua Center for Life Sciences, School of Life Sciences, Peking University, Beijing, China. gaon@pku.edu.cn.,HIT Center for Life Sciences, School of Life Science and Technology, Harbin Institute of Technology, Harbin, China. huangzhiwei@hit.edu.cn.,HIT Center for Life Sciences, School of Life Science and Technology, Harbin Institute of Technology, Harbin, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
T-cell surface glycoprotein CD3 zeta chain
a, b
164Homo sapiensMutation(s): 0 
Gene Names: CD247 (CD3Z, T3Z, TCRZ)
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Immune Receptors
Protein: 
T cell receptor-CD3 complex
Find proteins for P20963 (Homo sapiens)
Go to Gene View: CD247
Go to UniProtKB:  P20963
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
T-cell surface glycoprotein CD3 delta chain
d
171Homo sapiensMutation(s): 0 
Gene Names: CD3D (T3D)
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Immune Receptors
Protein: 
T cell receptor-CD3 complex
Find proteins for P04234 (Homo sapiens)
Go to Gene View: CD3D
Go to UniProtKB:  P04234
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
T-cell surface glycoprotein CD3 epsilon chain
f, e
207Homo sapiensMutation(s): 0 
Gene Names: CD3E (T3E)
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Immune Receptors
Protein: 
T cell receptor-CD3 complex
Find proteins for P07766 (Homo sapiens)
Go to Gene View: CD3E
Go to UniProtKB:  P07766
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
T-cell surface glycoprotein CD3 gamma chain
g
182Homo sapiensMutation(s): 0 
Gene Names: CD3G (T3G)
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Immune Receptors
Protein: 
T cell receptor-CD3 complex
Find proteins for P09693 (Homo sapiens)
Go to Gene View: CD3G
Go to UniProtKB:  P09693
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
T cell receptor alpha variable 12-3,Possible J 11 gene segment,T cell receptor alpha constant
m
252Homo sapiensMutation(s): 0 
Gene Names: Tcr-alpha, TRAV12-3, TRAC (TCRA)
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Immune Receptors
Protein: 
T cell receptor-CD3 complex
Find proteins for A0N4Z6 (Homo sapiens)
Go to UniProtKB:  A0N4Z6
Find proteins for A0A0B4J271 (Homo sapiens)
Go to UniProtKB:  A0A0B4J271
Find proteins for P01848 (Homo sapiens)
Go to UniProtKB:  P01848
Entity ID: 6
MoleculeChainsSequence LengthOrganismDetails
T cell receptor beta variable 6-5,M1-specific T cell receptor beta chain,T cell receptor beta constant 2
n
291Homo sapiensMutation(s): 0 
Gene Names: TRBC2, TRBV6-5, TRB
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Immune Receptors
Protein: 
T cell receptor-CD3 complex
Find proteins for A0A0G2JMB4 (Homo sapiens)
Go to UniProtKB:  A0A0G2JMB4
Find proteins for A0A0K0K1A5 (Homo sapiens)
Go to UniProtKB:  A0A0K0K1A5
Find proteins for P0DSE2 (Homo sapiens)
Go to Gene View: TRB
Go to UniProtKB:  P0DSE2
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.7 Å
  • Aggregation State: CELL 
  • Reconstruction Method: SINGLE PARTICLE 
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina--

Revision History 

  • Version 1.0: 2019-09-11
    Type: Initial release
  • Version 1.1: 2019-09-18
    Type: Data collection, Database references
  • Version 1.2: 2019-10-02
    Type: Data collection, Database references
  • Version 1.3: 2019-10-09
    Type: Data collection, Database references