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1egj
From Proteopedia
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[[Image:1egj.gif|left|200px]] | [[Image:1egj.gif|left|200px]] | ||
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'''DOMAIN 4 OF THE BETA COMMON CHAIN IN COMPLEX WITH AN ANTIBODY''' | '''DOMAIN 4 OF THE BETA COMMON CHAIN IN COMPLEX WITH AN ANTIBODY''' | ||
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[[Category: Rossjohn, J.]] | [[Category: Rossjohn, J.]] | ||
[[Category: Woodcock, J M.]] | [[Category: Woodcock, J M.]] | ||
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| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 15:04:29 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 12:04, 2 May 2008
DOMAIN 4 OF THE BETA COMMON CHAIN IN COMPLEX WITH AN ANTIBODY
Overview
Heterodimeric cytokine receptors generally consist of a major cytokine-binding subunit and a signaling subunit. The latter can transduce signals by more than 1 cytokine, as exemplified by the granulocyte-macrophage colony-stimulating factor (GM-CSF), interleukin-2 (IL-2), and IL-6 receptor systems. However, often the signaling subunits in isolation are unable to bind cytokines, a fact that has made it more difficult to obtain structural definition of their ligand-binding sites. This report details the crystal structure of the ligand-binding domain of the GM-CSF/IL-3/IL-5 receptor beta-chain (beta(c)) signaling subunit in complex with the Fab fragment of the antagonistic monoclonal antibody, BION-1. This is the first single antagonist of all 3 known eosinophil-producing cytokines, and it is therefore capable of regulating eosinophil-related diseases such as asthma. The structure reveals a fibronectin type III domain, and the antagonist-binding site involves major contributions from the loop between the B and C strands and overlaps the cytokine-binding site. Furthermore, tyrosine(421) (Tyr(421)), a key residue involved in receptor activation, lies in the neighboring loop between the F and G strands, although it is not immediately adjacent to the cytokine-binding residues in the B-C loop. Interestingly, functional experiments using receptors mutated across these loops demonstrate that they are cooperatively involved in full receptor activation. The experiments, however, reveal subtle differences between the B-C loop and Tyr(421), which is suggestive of distinct functional roles. The elucidation of the structure of the ligand-binding domain of beta(c) also suggests how different cytokines recognize a single receptor subunit, which may have implications for homologous receptor systems. (Blood. 2000;95:2491-2498)
About this Structure
1EGJ is a Protein complex structure of sequences from Homo sapiens and Mus musculus. Full crystallographic information is available from OCA.
Reference
Structure of the activation domain of the GM-CSF/IL-3/IL-5 receptor common beta-chain bound to an antagonist., Rossjohn J, McKinstry WJ, Woodcock JM, McClure BJ, Hercus TR, Parker MW, Lopez AF, Bagley CJ, Blood. 2000 Apr 15;95(8):2491-8. PMID:10753826 Page seeded by OCA on Fri May 2 15:04:29 2008
