6BJ8

TCR55 in complex with Pep20/HLA-B35


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.159 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Isolation of a Structural Mechanism for Uncoupling T Cell Receptor Signaling from Peptide-MHC Binding.

Sibener, L.V.Fernandes, R.A.Kolawole, E.M.Carbone, C.B.Liu, F.McAffee, D.Birnbaum, M.E.Yang, X.Su, L.F.Yu, W.Dong, S.Gee, M.H.Jude, K.M.Davis, M.M.Groves, J.T.Goddard III, W.A.Heath, J.R.Evavold, B.D.Vale, R.D.Garcia, K.C.

(2018) Cell 174: 672-687.e27

  • DOI: 10.1016/j.cell.2018.06.017
  • Primary Citation of Related Structures:  
    6BJ8, 6BJ3, 6BJ2

  • PubMed Abstract: 
  • TCR-signaling strength generally correlates with peptide-MHC binding affinity; however, exceptions exist. We find high-affinity, yet non-stimulatory, interactions occur with high frequency in the human T cell repertoire. Here, we studied human TCRs t ...

    TCR-signaling strength generally correlates with peptide-MHC binding affinity; however, exceptions exist. We find high-affinity, yet non-stimulatory, interactions occur with high frequency in the human T cell repertoire. Here, we studied human TCRs that are refractory to activation by pMHC ligands despite robust binding. Analysis of 3D affinity, 2D dwell time, and crystal structures of stimulatory versus non-stimulatory TCR-pMHC interactions failed to account for their different signaling outcomes. Using yeast pMHC display, we identified peptide agonists of a formerly non-responsive TCR. Single-molecule force measurements demonstrated the emergence of catch bonds in the activating TCR-pMHC interactions, correlating with exclusion of CD45 from the TCR-APC contact site. Molecular dynamics simulations of TCR-pMHC disengagement distinguished agonist from non-agonist ligands based on the acquisition of catch bonds within the TCR-pMHC interface. The isolation of catch bonds as a parameter mediating the coupling of TCR binding and signaling has important implications for TCR and antigen engineering for immunotherapy.


    Organizational Affiliation

    Departments of Molecular and Cellular Physiology and Structural Biology, Stanford University School of Medicine, Stanford, CA 94305, USA; Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, CA 94305, USA. Electronic address: kcgarcia@stanford.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
HLA class I histocompatibility antigen, B-35 alpha chainA276Homo sapiensMutation(s): 0 
Gene Names: HLA-BHLAB
Find proteins for P01889 (Homo sapiens)
Explore P01889 
Go to UniProtKB:  P01889
NIH Common Fund Data Resources
PHAROS  P01889
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Beta-2-microglobulinB99Homo sapiensMutation(s): 0 
Gene Names: B2MCDABP0092HDCMA22P
Find proteins for P61769 (Homo sapiens)
Explore P61769 
Go to UniProtKB:  P61769
NIH Common Fund Data Resources
PHAROS  P61769
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
TCR 55 alpha chainD204Homo sapiensMutation(s): 1 
Gene Names: TRA@
Find proteins for Q6IRV4 (Homo sapiens)
Explore Q6IRV4 
Go to UniProtKB:  Q6IRV4
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  • Reference Sequence
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
TCR 55 beta chainH242Homo sapiensMutation(s): 1 
Gene Names: B2M
Find proteins for K7N5M4 (Homo sapiens)
Explore K7N5M4 
Go to UniProtKB:  K7N5M4
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
VAL-PRO-LEU-THR-GLU-ASP-ALA-GLU-LEUC9synthetic constructMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

Download CCD File 
A, D, H
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
A, B, D, H
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.75 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.159 
  • R-Value Observed: 0.159 
  • Space Group: C 1 2 1
  • Diffraction Data DOI: 10.15785/SBGRID/517 SBGrid
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 194.492α = 90
b = 61.698β = 104.87
c = 92.145γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI07290
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesCA216926-01
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI57229
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI103867
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI096879
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)United StatesNS071518
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesA1091580
National Institutes of Health/National Cancer Institute (NIH/NCI)United StatesCA199090-01

Revision History 

  • Version 1.0: 2018-07-25
    Type: Initial release
  • Version 1.1: 2018-08-08
    Changes: Data collection, Database references
  • Version 1.2: 2019-02-20
    Changes: Author supporting evidence, Data collection
  • Version 1.3: 2019-11-27
    Changes: Author supporting evidence