Download MendeleyCrystal structure of the interleukin-4/receptor alpha chain complex reveals a mosaic binding interface.
Hage, T., Sebald, W., Reinemer, P.(1999) Cell 97: 271-281
- PubMed: 10219247
- DOI: https://doi.org/10.1016/s0092-8674(00)80736-9
- Primary Citation of Related Structures:
1IAR - PubMed Abstract:
Interleukin-4 (IL-4) is a principal regulatory cytokine during an immune response and a crucial determinant for allergy and asthma. IL-4 binds with high affinity and specificity to the ectodomain of the IL-4 receptor alpha chain (IL4-BP). Subsequently, this intermediate complex recruits the common gamma chain (gamma c), thereby initiating transmembrane signaling. The crystal structure of the intermediate complex between human IL-4 and IL4-BP was determined at 2.3 A resolution. It reveals a novel spatial orientation of the two proteins, a small but unexpected conformational change in the receptor-bound IL-4, and an interface with three separate clusters of trans-interacting residues. Novel insights on ligand binding in the cytokine receptor family and a paradigm for receptors of IL-2, IL-7, IL-9, and IL-15, which all utilize gamma c, are provided.
Organizational Affiliation:
Institut für Physiologische Chemie II, Theodor-Boveri-Institut für Biowissen Schaften (Biozentrum), Universität Würzburg, Germany.
