Download MendeleyStructural basis of interleukin-5 dimer recognition by its alpha receptor
Kusano, S., Kukimoto-Niino, M., Hino, N., Ohsawa, N., Ikutani, M., Takaki, S., Sakamoto, K., Hara-Yokoyama, M., Shirouzu, M., Takatsu, K., Yokoyama, S.(2012) Protein Sci 21: 850-864
- PubMed: 22528658
- DOI: https://doi.org/10.1002/pro.2072
- Primary Citation of Related Structures:
3VA2 - PubMed Abstract:
Interleukin-5 (IL-5), a major hematopoietin, stimulates eosinophil proliferation, migration, and activation, which have been implicated in the pathogenesis of allergic inflammatory diseases, such as asthma. The specific IL-5 receptor (IL-5R) consists of the IL-5 receptor α subunit (IL-5RA) and the common receptor β subunit (βc). IL-5 binding to IL-5R on target cells induces rapid tyrosine phosphorylation and activation of various cellular proteins, including JAK1/JAK2 and STAT1/STAT5. Here, we report the crystal structure of dimeric IL-5 in complex with the IL-5RA extracellular domains. The structure revealed that IL-5RA sandwiches the IL-5 homodimer by three tandem domains, arranged in a "wrench-like" architecture. This association mode was confirmed for human cells expressing IL-5 and the full-length IL-5RA by applying expanded genetic code technology: protein photo-cross-linking experiments revealed that the two proteins interact with each other in vivo in the same manner as that in the crystal structure. Furthermore, a comparison with the previously reported, partial GM-CSF•GM-CSFRA•βc structure enabled us to propose complete structural models for the IL-5 and GM-CSF receptor complexes, and to identify the residues conferring the cytokine-specificities of IL-5RA and GM-CSFRA.
Organizational Affiliation:
RIKEN Systems and Structural Biology Center, Tsurumi-ku, Yokohama, Japan.
