The crystal structure of zebrafish IL-22 reveals an evolutionary, conserved structure highly similar to that of human IL-22

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  • Piotr Siupka, Danmark
  • Ole Jensen Hamming, Danmark
  • M Frétaud, Macrophages et Développement de l'Immunité, Institut Pasteur, Paris, CNRS URA2578, Paris, Frankrig
  • G Luftalla, UM2, Dynamique des Interactions Membranaires Normales et Pathologiques, Montpellier, Frankrig
  • J-P Levraud, Macrophages et Développement de l'Immunité, Institut Pasteur, Paris, CNRS URA2578, Paris, Frankrig
  • Rune Hartmann

The class II cytokine family consists of small α-helical signaling proteins including the interleukin-10 (IL-10)/IL-22 family, as well as interferons (IFNs). They regulate the innate immune response and in addition have an important role in protecting epithelial tissues. Teleost fish possess a class II cytokine system surprisingly similar to that of humans, and thus zebrafish offers an attractive model organism for investigating the role of class II cytokines in inflammation. However, the evolution of class II cytokines is critical to understand if we are to take full advantage of zebrafish as a model system. The small size and fast evolution of these cytokines obscure phylogenetic analyses based purely on sequences, but one can overcome this obstacle by using information contained within the structure of those molecules. Here we present the crystal structure of IL-22 from zebrafish (zIL-22) solved at 2.1 Å, which displays a typical class II cytokine architecture. We generated a structure-guided alignment of vertebrate class II cytokines and used it for phylogenetic analysis. Our analysis suggests that IL-22 and IL-26 arose early during the evolution of the IL-10-like cytokines. Thus, we propose an evolutionary scenario of class II cytokines in vertebrates, based on genomic and structural data.

OriginalsprogEngelsk
TidsskriftGenes and Immunity
Vol/bind15
Nummer5
Sider (fra-til)293-302
Antal sider10
ISSN1466-4879
DOI
StatusUdgivet - 17 maj 2014

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