Creation of a biologically active interleukin-5 monomer.

Abstract:

:Interleukin-5 (IL-5) specifically induces the differentiation of eosinophils, which are important in host defence and the pathogenesis of allergies and asthma. Structurally, IL-5 is a unique member of the short-chain helical-bundle subfamily of cytokines whose canonical motif contains four helices (A-D) arranged in an up-up-down-down topology. In contrast to other subfamily members, which fold unimolecularly into a single helical bundle, IL-5 forms a pair of helical bundles by the interdigitation of two identical monomers that contribute a D helix to the other's A-C helices. We predicted that the lack of bioactivity by an IL-5 monomer was due to a short loop between helices C and D which physically prevents unimolecular folding of helix D into a functionally obligate structural motif. Here we report that, by lengthening this loop, we have engineered an insertional mutant of IL-5 that was expressed as a monomer with biological activity similar to that of native IL-5. These studies demonstrate that all of the structural features necessary for IL-5 to function are contained within a single helical bundle.

journal_name

Nature

journal_title

Nature

authors

Dickason RR,Huston DP

doi

10.1038/379652a0

subject

Has Abstract

pub_date

1996-02-15 00:00:00

pages

652-5

issue

6566

eissn

0028-0836

issn

1476-4687

journal_volume

379

pub_type

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