3BPN

Crystal structure of the IL4-IL4R-IL13Ra ternary complex

Summary for 3BPN

• Entry DOI: 10.2210/pdb3bpn/pdb
• Related: 3BPL 3BPO
• Descriptor: Interleukin-4, Interleukin-4 receptor alpha chain, Interleukin-13 receptor alpha-1 chain, ... (5 entities in total)
• Functional Keywords: il4, il13, il13r, il4r, cytokine, receptor, b-cell activation, glycoprotein, growth factor, secreted, immune response, membrane, phosphoprotein, transmembrane, cytokine-cytokine receptor complex, cytokine/cytokine receptor
• Biological source: Homo sapiens (human); More
• Total number of polymer chains: 3
• Total formula weight: 75263.71

Authors

Garcia, K.C. (deposition date: 2007-12-18, release date: 2008-02-05, Last modification date: 2024-11-13)

Primary citation

Laporte, S.L.,Juo, Z.S.,Vaclavikova, J.,Colf, L.A.,Qi, X.,Heller, N.M.,Keegan, A.D.,Garcia, K.C.
Molecular and Structural Basis of Cytokine Receptor Pleiotropy in the Interleukin-4/13 System.
Cell(Cambridge,Mass.), 132:259-272, 2008

PubMed Abstract: Interleukin-4 and Interleukin-13 are cytokines critical to the development of T cell-mediated humoral immune responses, which are associated with allergy and asthma, and exert their actions through three different combinations of shared receptors. Here we present the crystal structures of the complete set of type I (IL-4R alpha/gamma(c)/IL-4) and type II (IL-4R alpha/IL-13R alpha1/IL-4, IL-4R alpha/IL-13R alpha1/IL-13) ternary signaling complexes. The type I complex reveals a structural basis for gamma(c)'s ability to recognize six different gamma(c)-cytokines. The two type II complexes utilize an unusual top-mounted Ig-like domain on IL-13R alpha1 for a novel mode of cytokine engagement that contributes to a reversal in the IL-4 versus IL-13 ternary complex assembly sequences, which are mediated through substantially different recognition chemistries. We also show that the type II receptor heterodimer signals with different potencies in response to IL-4 versus IL-13 and suggest that the extracellular cytokine-receptor interactions are modulating intracellular membrane-proximal signaling events.

PubMed: 18243101
DOI: 10.1016/j.cell.2007.12.030

Experimental method

X-RAY DIFFRACTION (3.02 Å)