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Ribosomal protein S19 interacts with macrophage migration inhibitory factor and attenuates its pro-inflammatory
Ana-Maria Filip1, Jörg Klug, Sevil Cayli
1Department of Anatomy and Cell Biology, Unit of Reproductive Biology, Medical Clinic II, and Department of Biochemistry, Justus-Liebig-University of Giessen, Giessen D-35385, Germany.
The Journal of Biological Chemistry
|January 22, 2009
Summary
Ribosomal protein S19 (RPS19) binds to macrophage migration inhibitory factor (MIF) and inhibits its inflammatory functions. This discovery reveals RPS19 as a potential therapeutic target for inflammatory diseases.
Area of Science:
- Immunology
- Molecular Biology
- Biochemistry
Background:
- Macrophage migration inhibitory factor (MIF) is a key cytokine in inflammatory disorders.
- MIF possesses intrinsic enzymatic activities and circulates at elevated levels during inflammation.
- Understanding MIF regulation is crucial for developing targeted therapies.
Purpose of the Study:
- To identify endogenous proteins that interact with MIF and modulate its function.
- To investigate the functional consequences of MIF-protein interactions in inflammatory pathways.
Main Methods:
- In vivo biotin-tagging and co-immunoprecipitation to identify MIF-binding partners.
- Surface plasmon resonance and pulldown assays to confirm direct protein-protein interactions.
- In vitro assays to assess the impact of identified proteins on MIF-receptor binding and cell adhesion.
Main Results:
- Ribosomal protein S19 (RPS19) was identified as a novel binding partner of MIF.
- RPS19 directly interacts with MIF with a dissociation constant (KD) of 1.3 x 10(-6) M.
- RPS19 inhibits MIF binding to its receptors CD74 and CXCR2.
- RPS19 significantly impairs monocyte adhesion to endothelial cells, a process mediated by MIF via CXCR2.
Conclusions:
- RPS19 acts as an extracellular negative regulator of MIF.
- The interaction between RPS19 and MIF offers a new therapeutic strategy for inflammatory conditions.
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