4R0L

Anti-canine CD28 antibody, 1C6, bound canine CD28


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.256 
  • R-Value Observed: 0.258 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 2.0 of the entry. See complete history


Literature

Anti-CD28 Antibody-Initiated Cytokine Storm in Canines.

Rosinski, S.L.Storb, R.Strong, R.K.Sale, G.E.Stone, D.M.Gewe, M.M.Friend, D.J.Abrams, V.K.Randolph-Habecker, J.Graves, S.S.

(2015) Transplant Direct 1

  • DOI: https://doi.org/10.1097/TXD.0000000000000516
  • Primary Citation of Related Structures:  
    4R0L

  • PubMed Abstract: 

    CD28 signal blockade following T cell receptor activation is under intense investigation as a tolerance-inducing therapy for transplantation. Our goal is to produce a CD28-specific reagent as a therapy for the prevention of graft rejection and graft-versus-host disease in the canine model of allogeneic hematopoietic cell transplantation (HCT). We infused a monoclonal mouse anti-canine CD28 antibody (1C6 mAb) into four dogs and a fragment of antigen-binding (1C6 Fab) into two dogs. Pharmacokinetics, pathology, cytokine release, and the crystal structure of 1C6 Fv were evaluated. Within an hour of an IV injection of the 1C6 mAb, the dogs became leukopenic and developed a steroid-refractory cytokine storm. Two of the dogs developed high fevers, one experienced diffuse alveolar hemorrhage, and another developed gastrointestinal hemorrhage. The cytokine storm was characterized by elevated plasma levels of MCP-1, IP-10, IL-10, IL-6, and TNF-α. In addition, one dog showed elevated levels of IL-2, IL-8, and IL-18. In contrast, infusion of 1C6 Fab was well tolerated without any side effects. Dry-coating 1C6 mAb onto tissue culture plates induced CD3-independent proliferation and TNF-alpha production. Crystal structure analysis revealed that 1C6 binds to canine CD28 in a manner different than previously reported for conventional agonistic or superagonistic antibodies. These results indicate that dogs and humans develop a similar cytokine storm following infusion ofanti-CD28 mAb, providing an appropriate large animal for further study. 1C6 Fab warrants evaluation as a tolerance-inducing reagent in the canine model of allogeneic HCT.


  • Organizational Affiliation

    Clinical Research Division, Fred Hutchinson Cancer Research Center, Seattle Washington, 98109 ; Department of Medicine, University of Washington, Seattle, Washington, 98195.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Antibody 1C6 Heavy chainA,
D [auth H]
121Mus musculusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
T-cell costimulatory molecule CD28B [auth C],
C [auth D]
129Canis lupus familiarisMutation(s): 0 
Gene Names: CD28
UniProt
Find proteins for Q9N0N8 (Canis lupus familiaris)
Explore Q9N0N8 
Go to UniProtKB:  Q9N0N8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9N0N8
Glycosylation
Glycosylation Sites: 4
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Antibody 1C6 Light chainE [auth L],
F [auth B]
117Mus musculusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

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Entity ID: 4
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranoseG [auth E],
I [auth G]
3N-Glycosylation
Glycosylation Resources
GlyTouCan:  G21290RB
GlyCosmos:  G21290RB
GlyGen:  G21290RB
Entity ID: 5
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranoseH [auth F]2N-Glycosylation
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.293 
  • R-Value Work: 0.256 
  • R-Value Observed: 0.258 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.783α = 90
b = 86.783β = 90
c = 205.804γ = 120
Software Package:
Software NamePurpose
ADSCdata collection
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-08
    Type: Initial release
  • Version 1.1: 2016-08-03
    Changes: Source and taxonomy
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Structure summary