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Ligand-induced assembling of the type I interferon receptor on supported lipid bilayers.

Abstract：

:Type I interferons (IFNs) elicit antiviral, antiproliferative and immuno-modulatory responses through binding to a shared receptor consisting of the transmembrane proteins ifnar1 and ifnar2. Differential signaling by different interferons, in particular IFNalphas and IFNbeta, suggests different modes of receptor engagement. Using reflectometric interference spectroscopy (RIfS), we studied kinetics and affinities of the interactions between IFNs and the extracellular receptor domains of ifnar1 (ifnar1-EC) and ifnar2 (ifnar2-EC). For IFNalpha2, we determined a K(D) value of 3 nM and 5 microM for the interaction with ifnar2-EC and ifnar1-EC, respectively. As compared to IFNalpha2, IFNbeta formed complexes with ifnar2-EC as well as ifnar1-EC with substantially higher affinity. For neither IFNalpha2 nor IFNbeta was stabilization of the complex with ifnar1-EC in the presence of soluble ifnar2-EC observed. We investigated ligand-induced complex formation with ifnar1-EC and ifnar2-EC being tethered onto solid-supported, fluid lipid bilayers by RIfS and total internal reflection fluorescence spectroscopy. We observed very stable binding of IFNalpha2 at high receptor surface concentrations with an apparent k(d) value approximately 200 times lower than that for ifnar2-EC alone. The apparent k(d) value was strongly dependent on the surface concentration of the receptor components, suggesting kinetic stabilization. This was corroborated by the fast exchange of labeled IFNalpha2 bound to the receptor by unlabeled IFNalpha2. Taken together, our results indicate that IFN first binds to ifnar2 and subsequently recruits ifnar1 in a transient fashion. In particular, this second step is much more efficient for IFNbeta than for IFNalpha2, which could explain differential activities observed for these IFNs.

journal_name

J Mol Biol

journal_title

Journal of molecular biology

authors

Lamken P,Lata S,Gavutis M,Piehler J

doi

10.1016/j.jmb.2004.05.059

keywords:

subject

Has Abstract

pub_date

2004-07-30 00:00:00

pages

303-18

issue

1

eissn

0022-2836

issn

1089-8638

pii

S0022283604006394

journal_volume

341

pub_type

杂志文章

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