Convergent mechanisms for recognition of divergent cytokines by the shared signaling receptor gp130

TitleConvergent mechanisms for recognition of divergent cytokines by the shared signaling receptor gp130
Publication TypeJournal Article
Year of Publication2003
AuthorsBoulanger, M. J., Bankovich A. J., Kortemme T., Baker D., & Garcia C. K.
JournalMolecular cell
Volume12
Issue3
Pagination577-89
Date Published2003 Sep
ISSN1097-2765
KeywordsAnimals, Antigens, CD, Binding Sites, Cells, Cultured, Collaborative Publication, Cross Reactions, Crystallography, X-Ray, Cytokine Receptor gp130, Cytokines, Eukaryotic Cells, Growth Inhibitors, Immunity, Cellular, Insects, Interleukin-6, Leukemia Inhibitory Factor, Lymphokines, Macromolecular Substances, Membrane Glycoproteins, Models, Molecular, Molecular Structure, Protein Binding, Protein Structure, Tertiary, Receptors, Cell Surface
Abstract

Gp130 is a shared cell-surface signaling receptor for at least ten different hematopoietic cytokines, but the basis of its degenerate recognition properties is unknown. We have determined the crystal structure of human leukemia inhibitory factor (LIF) bound to the cytokine binding region (CHR) of gp130 at 2.5 A resolution. Strikingly, we find that the shared binding site on gp130 has an entirely rigid core, while the LIF binding interface diverges sharply in structure and chemistry from that of other gp130 ligands. Dissection of the LIF-gp130 interface, along with comparative studies of other gp130 cytokines, reveal that gp130 has evolved a "thermodynamic plasticity" that is relatively insensitive to ligand structure, to enable crossreactivity. These observations reveal a novel and alternative mechanism for degenerate recognition from that of structural plasticity.

Alternate JournalMol. Cell
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