PMID: 19285080

Authors:

de Moura PR, Watanabe L, Bleicher L, Colau D, Dumoutier L, Lemaire MM, Renauld JC, Polikarpov I

Title:

Crystal structure of a soluble decoy receptor IL-22BP bound to interleukin-22.

Journal:

FEBS Lett. 2009 Apr 2;583(7):1072-7. Epub 2009 Mar 11.

Abstract:

Interleukin-22 (IL-22) plays an important role in the regulation of immune and inflammatory responses in mammals. The IL-22 binding protein (IL-22BP), a soluble receptor that specifically binds IL-22, prevents the IL-22/interleukin-22 receptor 1 (IL-22R1)/interleukin-10 receptor 2 (IL-10R2) complex assembly and blocks IL-22 biological activity. Here we present the crystal structure of the IL-22/IL-22BP complex at 2.75 A resolution. The structure reveals IL-22BP residues critical for IL-22 binding, which were confirmed by site-directed mutagenesis and functional studies. Comparison of IL-22/IL-22BP and IL-22/IL-22R1 crystal structures shows that both receptors display an overlapping IL-22 binding surface, which is consistent with the inhibitory role played by IL-22 binding protein.