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Related Experiment Videos

Structure of insect-cell-derived IL-22.

Ting Xu1, Naomi J Logsdon, Mark R Walter

  • 1Center for Biophysical Sciences and Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA.

Acta Crystallographica. Section D, Biological Crystallography
|June 29, 2005
PubMed
Summary

The crystal structure of interleukin-22 (IL-22) from fruit flies reveals minor effects of glycosylation but significant variations in receptor binding sites. These findings offer new insights into how IL-22 interacts with its receptors.

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Area of Science:

  • Structural Biology
  • Immunology
  • Biochemistry

Background:

  • Interleukin-22 (IL-22) is a cytokine crucial for immune responses and tissue homeostasis.
  • Understanding IL-22 structure is key to elucidating its receptor interactions and biological functions.

Purpose of the Study:

  • To determine the crystal structure of IL-22 expressed in Drosophila melanogaster (IL-22(Dm)).
  • To compare IL-22(Dm) with IL-22 produced in E. coli (IL-22(Ec)) to assess glycosylation effects.
  • To investigate conformational variations within IL-22(Dm) relevant to receptor binding.

Main Methods:

  • X-ray crystallography was used to determine the structure of IL-22(Dm) at 2.6 A resolution.
  • Comparative structural analysis was performed between IL-22(Dm) and IL-22(Ec).

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  • Analysis focused on regions involved in binding to IL-22 receptor 1 (IL-22R1) and IL-10 receptor 2 (IL-10R2).

    • Main Results:

    • The crystal structure of IL-22(Dm) revealed six molecules in the asymmetric unit.
    • N-linked glycosylation induced only minor structural changes in IL-22(Dm) compared to IL-22(Ec).
    • Significant main-chain differences (1-4 A) were observed among the IL-22(Dm) monomers at the IL-22R1 and IL-10R2 binding interfaces.

    Conclusions:

    • The determined structure of IL-22(Dm) provides valuable insights into its overall conformation.
    • Carbohydrate structure and monomeric conformational variations influence IL-22 receptor recognition.
    • These findings contribute to a deeper understanding of IL-22 signaling pathways.