A modular interface of IL-4 allows for scalable affinity without affecting specificity for the IL-4 receptor.

BMC Biology
Michael KraichThomas D Mueller

Abstract

Interleukin 4 (IL-4) is a key regulator of the immune system and an important factor in the development of allergic hypersensitivity. Together with interleukin 13 (IL-13), IL-4 plays an important role in exacerbating allergic and asthmatic symptoms. For signal transduction, both cytokines can utilise the same receptor, consisting of the IL-4Ralpha and the IL-13Ralpha1 chain, offering an explanation for their overlapping biological functions. Since both cytokine ligands share only moderate similarity on the amino acid sequence level, molecular recognition of the ligands by both receptor subunits is of great interest. IL-4 and IL-13 are interesting targets for allergy and asthma therapies. Knowledge of the binding mechanism will be important for the generation of either IL-4 or IL-13 specific drugs. We present a structure/function analysis of the IL-4 ligand-receptor interaction. Structural determination of a number of IL-4 variants together with in vitro binding studies show that IL-4 and its high-affinity receptor subunit IL-4Ralpha interact via a modular protein-protein interface consisting of three independently-acting interaction clusters. For high-affinity binding of wild-type IL-4 to its receptor IL-4Ralpha, only two of th...Continue Reading

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Methods Mentioned

BETA
surface plasmon resonance
x-ray crystallography
biosensor
chip
equilibrium binding
chips

Software Mentioned

COINJECT
BIAcore
QUANTA2000
MOSFLM
BIAevaluation
SCALA CCP4
CNS
REFMAC5

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