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Visualization of IL-22-expressing Lymphocytes Using Reporter Mice
Published on: January 25, 2017
Crystal structure of recombinant human interleukin-22
Ronaldo Alves Pinto Nagem1, Didier Colau, Laure Dumoutier
1Laboratório Nacional de Luz Síncrotron, São Paulo, Brazil.
Structure (London, England : 1993)
|August 15, 2002
Summary
Interleukin-22 (IL-22), a novel cytokine, activates inflammatory pathways in liver cells. Unlike IL-10, IL-22 likely functions as a monomer, not a dimer, based on its unique crystal structure.
Area of Science:
- Immunology
- Structural Biology
- Cytokine Signaling
Background:
- Interleukin-22 (IL-22) is a novel cytokine within the IL-10 family.
- IL-22 plays a role in inflammatory responses, particularly in hepatoma cell lines.
Purpose of the Study:
- To elucidate the structural characteristics of recombinant human IL-22 (hIL-22).
- To compare the structural and potential signaling mechanisms of hIL-22 with IL-10.
Main Methods:
- Crystallographic structure determination of recombinant hIL-22 at 2.0 Å resolution.
- Utilized the SIRAS (Single Isomorphous Replacement with Anomalous Scattering) method.
Main Results:
- The hIL-22 dimer structure results from interface interactions between monomers, lacking interpenetration of secondary structure elements.
- Structural analysis revealed significant differences compared to IL-10, which requires homodimerization for signaling.
- hIL-22 activates STAT1 and STAT3 signaling pathways and acute phase reactants in hepatoma cells.
Conclusions:
- The crystallographic structure of hIL-22 suggests it interacts with its receptor as a monomer.
- This monomeric interaction contrasts with the dimeric requirement for IL-10 signaling.
- These findings provide insights into the distinct molecular mechanisms of IL-22 and IL-10.
