9BBC image
Entry Detail
PDB ID:
9BBC
EMDB ID:
Keywords:
Title:
TCR GDN detergent micelle
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2024-04-05
Release Date:
2024-10-02
Method Details:
Experimental Method:
Resolution:
3.30 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:TCRa
Chain IDs:A
Chain Length:273
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:TCRb
Chain IDs:B
Chain Length:305
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:T-cell surface glycoprotein CD3 delta chain
Chain IDs:C (auth: D)
Chain Length:171
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:T-cell surface glycoprotein CD3 epsilon chain
Chain IDs:D (auth: E), E (auth: F)
Chain Length:207
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:T-cell surface glycoprotein CD3 gamma chain
Chain IDs:F (auth: G)
Chain Length:137
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:T-cell surface glycoprotein CD3 zeta chain
Chain IDs:G (auth: X), H (auth: Y)
Chain Length:164
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
The resting and ligand-bound states of the membrane-embedded human T-cell receptor-CD3 complex.
Biorxiv ? ? ? (2024)
PMID: 37662363 DOI: 10.1101/2023.08.22.554360

Abstact

The T-cell receptor (TCR) initiates T-lymphocyte activation, but mechanistic questions remain(1-4). Here, we present cryogenic electron microscopy structures for the unliganded and human leukocyte antigen (HLA)-bound human TCR-CD3 complex in nanodiscs that provide a native-like lipid environment. Distinct from the "open and extended" conformation seen in detergent(5-8), the unliganded TCR-CD3 in nanodiscs adopts two related "closed and compacted" conformations that represent its physiologic resting state in vivo . By contrast, the HLA-bound complex adopts the open and extended conformation, and conformation-locking disulfide mutants show that ectodomain opening is necessary for maximal ligand-dependent T-cell activation. Together, these results reveal allosteric conformational change during TCR activation and highlight the importance of native-like lipid environments for membrane protein structure determination.

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Primary Citation of related structures