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An ELISA Based Binding and Competition Method to Rapidly Determine Ligand-receptor Interactions
Published on: March 14, 2016
Interleukin-36 (IL-36) ligands require processing for full agonist (IL-36α, IL-36β, and IL-36γ) or antagonist
Jennifer E Towne1, Blair R Renshaw1, Jason Douangpanya1
1Department of Inflammation Research, Amgen Incorporated, Seattle, Washington 98119.
The Journal of Biological Chemistry
|October 4, 2011
Summary
Interleukin-36 alpha (IL-36α), IL-36β, and IL-36γ are inflammatory cytokines. IL-36Ra acts as an antagonist, but its activity depends on processing, suggesting a mechanism similar to IL-1Ra.
Area of Science:
- Immunology
- Cell Signaling
- Protein Biochemistry
Background:
- Interleukin-36 (IL-36) cytokines (IL-36α, IL-36β, IL-36γ) are key mediators in inflammatory responses.
- These cytokines signal through a receptor complex involving IL-1Rrp2 and IL-1RAcP.
- IL-36Ra has been proposed as an antagonist, but its precise mechanism and efficacy were unclear.
Purpose of the Study:
- To elucidate the mechanism of IL-36Ra antagonism.
- To investigate the role of N-terminal processing in the activity of IL-36 cytokines and their antagonist.
- To compare the antagonism mechanism of IL-36Ra with that of IL-1Ra.
Main Methods:
- Biochemical assays to assess the antagonist activity of IL-36Ra.
- Site-directed mutagenesis to remove the N-terminal methionine of IL-36Ra.
- Truncation mutagenesis of IL-36α, IL-36β, and IL-36γ.
- Chimeric receptor experiments to identify the role of receptor domains.
- Co-immunoprecipitation assays to study receptor complex formation.
Main Results:
- IL-36Ra antagonist activity is dependent on the removal of its N-terminal methionine; processed IL-36Ra inhibits IL-36α, IL-36β, and IL-36γ.
- Truncation of IL-36α, IL-36β, and IL-36γ to a conserved motif dramatically enhances their specific activity.
- IL-36Ra binds to IL-1Rrp2, preventing IL-1RAcP recruitment, analogous to IL-1Ra's mechanism.
- The extracellular domain of IL-1Rrp2 is crucial for IL-36Ra-mediated inhibition.
Conclusions:
- Post-translational processing, specifically N-terminal methionine removal, is critical for both IL-36 cytokine activity and IL-36Ra antagonist function.
- IL-36Ra antagonizes IL-36 cytokines by preventing the formation of a functional signaling receptor complex.
- The findings provide insights into the regulation of IL-36 signaling pathways and their potential therapeutic targeting.
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