8JEN

Crystal structure of TIGIT in complexed with Ociperlimab, crystal form II


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.71 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.221 

Starting Models: experimental
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This is version 1.2 of the entry. See complete history


Literature

Structural insights into the unique pH-responsive characteristics of the anti-TIGIT therapeutic antibody Ociperlimab.

Sun, J.Zhang, X.Xue, L.Cheng, L.Zhang, J.Chen, X.Shen, Z.Li, K.Wang, L.Huang, C.Song, J.

(2024) Structure 32: 550

  • DOI: https://doi.org/10.1016/j.str.2024.02.009
  • Primary Citation of Related Structures:  
    8JEL, 8JEN, 8JEO, 8JEP, 8JEQ

  • PubMed Abstract: 

    TIGIT is mainly expressed on T cells and is an inhibitory checkpoint receptor that binds to its ligand PVR in the tumor microenvironment. Anti-TIGIT monoclonal antibodies (mAbs) such as Ociperlimab and Tiragolumab block the TIGIT-PVR interaction and are in clinical development. However, the molecular blockade mechanism of these mAbs remains elusive. Here, we report the crystal structures of TIGIT in complex with Ociperlimab_Fab and Tiragolumab_Fab revealing that both mAbs bind TIGIT with a large steric clash with PVR. Furthermore, several critical epitopic residues are identified. Interestingly, the binding affinity of Ociperlimab toward TIGIT increases approximately 17-fold when lowering the pH from 7.4 to 6.0. Our structure shows a strong electrostatic interaction between ASP103 HCDR3 and HIS76 TIGIT explaining the pH-responsive mechanism of Ociperlimab. In contrast, Tiragolumab does not show an acidic pH-dependent binding enhancement. Our results provide valuable information that could help to improve the efficacy of therapeutic antibodies for cancer treatment.


  • Organizational Affiliation

    Department of Biologics, BeiGene (Beijing) Co., Ltd, Beijing, China.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
antibody heavy chainA,
C,
E,
K [auth G]
222Homo sapiensMutation(s): 0 
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
antibody light chainB,
D,
F,
L [auth H]
214Homo sapiensMutation(s): 0 
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
T-cell immunoreceptor with Ig and ITIM domainsG [auth I],
H [auth J],
I [auth M],
J [auth P]
115Homo sapiensMutation(s): 0 
Gene Names: TIGITVSIG9VSTM3
UniProt & NIH Common Fund Data Resources
Find proteins for Q495A1 (Homo sapiens)
Explore Q495A1 
Go to UniProtKB:  Q495A1
GTEx:  ENSG00000181847 
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UniProt GroupQ495A1
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.71 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.221 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.32α = 90
b = 79.35β = 101.67
c = 173.69γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata scaling
XDSdata reduction
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Not funded--

Revision History  (Full details and data files)

  • Version 1.0: 2024-02-28
    Type: Initial release
  • Version 1.1: 2024-03-20
    Changes: Database references
  • Version 1.2: 2024-05-22
    Changes: Database references