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J Biol Chem, Vol. 274, Issue 9, 5755-5761, February 26, 1999

Identification of Three Distinct Receptor Binding Sites of Murine Interleukin-11

Victoria A. Barton, Keith R. Hudson, and John K. Heath

From the Cancer Research Campaign Growth Factor Group, Department of Biochemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom

Interleukin-11 (IL-11) is a member of the gp130 family of cytokines. These cytokines drive the assembly of multisubunit receptor complexes, all of which contain at least one molecule of the transmembrane signaling receptor gp130. A complex of IL-11 and the IL-11 receptor (IL-11R) has been shown to interact with gp130, with high affinity, and to induce gp130- dependent signaling. In this study, we have identified residues crucial for the binding of murine IL-11 (mIL-11) to both the IL-11R and gp130 by examining the activities of mIL-11 mutants in receptor binding and cell proliferation assays. The location of these residues, as predicted from structural studies and a model of IL-11, reveals that mIL-11 has three distinct receptor binding sites. These are structurally and functionally analogous to the previously defined receptor binding sites I, II, and III of interleukin-6 (IL-6). This supports the hypothesis that IL-11 signals via the formation of a hexameric receptor complex and indicates that site III is a generic feature of cytokines that signal via association with gp130.


Copyright © 1999 by The American Society for Biochemistry and Molecular Biology, Inc.

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