3GJF

Rational development of high-affinity T-cell receptor-like antibodies


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.202 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Rational development of high-affinity T-cell receptor-like antibodies

Stewart-Jones, G.Wadle, A.Hombach, A.Shenderov, E.Held, G.Fischer, E.Kleber, S.Stenner-Liewen, F.Bauer, S.McMichael, A.Knuth, A.Abken, H.Hombach, A.A.Cerundolo, V.Jones, E.Y.Renner, C.

(2009) Proc.Natl.Acad.Sci.USA 106: 5784-5788

  • DOI: 10.1073/pnas.0901425106
  • Primary Citation of Related Structures:  3GJE, 3GJG, 3HAE

  • PubMed Abstract: 
  • T-cell interaction with a target cell is a key event in the adaptive immune response and primarily driven by T-cell receptor (TCR) recognition of peptide-MHC (pMHC) complexes. TCR avidity for a given pMHC is determined by number of MHC molecules, ava ...

    T-cell interaction with a target cell is a key event in the adaptive immune response and primarily driven by T-cell receptor (TCR) recognition of peptide-MHC (pMHC) complexes. TCR avidity for a given pMHC is determined by number of MHC molecules, availability of coreceptors, and TCR affinity for MHC or peptide, respectively, with peptide recognition being the most important factor to confer target specificity. Here we present high-resolution crystal structures of 2 Fab antibodies in complex with the immunodominant NY-ESO-1(157-165) peptide analogue (SLLMWITQV) presented by HLA-A*0201 and compare them with a TCR recognizing the same pMHC. Binding to the central methionine-tryptophan peptide motif and orientation of binding were almost identical for Fabs and TCR. As the MW "peg" dominates the contacts between Fab and peptide, we estimated the contributions of individual amino acids between the Fab and peptide to provide the rational basis for a peptide-focused second-generation, high-affinity antibody library. The final Fab candidate achieved better peptide binding by 2 light-chain mutations, giving a 20-fold affinity improvement to 2-4 nM, exceeding the affinity of the TCR by 1,000-fold. The high-affinity Fab when grafted as recombinant TCR on T cells conferred specific killing of HLA-A*0201/NY-ESO-1(157-165) target cells. In summary, we prove that affinity maturation of antibodies mimicking a TCR is possible and provide a strategy for engineering high-affinity antibodies that can be used in targeting specific pMHC complexes for diagnostic and therapeutic purposes.


    Organizational Affiliation

    Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HLA class I histocompatibility antigen, A-2 alpha chain
A, D
276Homo sapiensGene Names: HLA-A (HLAA)
Find proteins for P01892 (Homo sapiens)
Go to Gene View: HLA-A
Go to UniProtKB:  P01892
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Beta-2-microglobulin
B, E
100Homo sapiensGene Names: B2M
Find proteins for P61769 (Homo sapiens)
Go to Gene View: B2M
Go to UniProtKB:  P61769
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
NYESO-1 peptide
C, F
9Homo sapiensGene Names: CTAG1A, CTAG1B (CTAG, CTAG1, ESO1, LAGE2, LAGE2A, LAGE2B)
Find proteins for P78358 (Homo sapiens)
Go to Gene View: CTAG1A CTAG1B
Go to UniProtKB:  P78358
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
Antibody light chain
L, K
212N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
Antibody heavy chain
H, M
220N/AN/A
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.202 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 71.601α = 90.00
b = 111.841β = 93.49
c = 124.715γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
PHASERphasing
SCALEPACKdata scaling
ADSCdata collection
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-04-28
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance