4GAF image
Entry Detail
PDB ID:
4GAF
Title:
Crystal structure of EBI-005, a chimera of human IL-1beta and IL-1Ra, bound to human Interleukin-1 receptor type 1
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2012-07-25
Release Date:
2013-02-20
Method Details:
Experimental Method:
Resolution:
2.15 Å
R-Value Free:
0.27
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:EBI-005
Chain IDs:A
Chain Length:153
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Interleukin-1 receptor type 1
Chain IDs:B
Chain Length:319
Number of Molecules:1
Biological Source:Homo sapiens
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN B ASN GLYCOSYLATION SITE
Primary Citation
Design of a superior cytokine antagonist for topical ophthalmic use.
Proc.Natl.Acad.Sci.USA 110 3913 3918 (2013)
PMID: 23431173 DOI: 10.1073/pnas.1217996110

Abstact

IL-1 is a key inflammatory and immune mediator in many diseases, including dry-eye disease, and its inhibition is clinically efficacious in rheumatoid arthritis and cryopyrin-associated periodic syndromes. To treat ocular surface disease with a topical biotherapeutic, the uniqueness of the site necessitates consideration of the agent's size, target location, binding kinetics, and thermal stability. Here we chimerized two IL-1 receptor ligands, IL-1β and IL-1Ra, to create an optimized receptor antagonist, EBI-005, for topical ocular administration. EBI-005 binds its target, IL-1R1, 85-fold more tightly than IL-1Ra, and this increase translates to an ∼100-fold increase in potency in vivo. EBI-005 preserves the affinity bias of IL-1Ra for IL-1R1 over the decoy receptor (IL-1R2), and, surprisingly, is also more thermally stable than either parental molecule. This rationally designed antagonist represents a unique approach to therapeutic design that can potentially be exploited for other β-trefoil family proteins in the IL-1 and FGF families.

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Primary Citation of related structures