A dual role for the kinase-like domain of the tyrosine kinase Tyk2 in interferon-alpha signaling.

Abstract:

:Tyrosine kinases of the Janus kinase family initiate cellular responses through their association with receptors for alpha-helical cytokines. In addition to a tyrosine kinase domain, these enzymes possess a kinase-like (KL) domain, whose function remains elusive. To investigate the role of the KL domain of Tyk2 in interferon-alpha/beta signaling, we transfected a library of Tyk2 cDNAs containing random point mutations in KL into Tyk2-negative cells and selected for loss-of-function Tyk2 mutants. Four such mutants, V584D, G596V, H669P, and R856G, were identified through this screen. Like the wild-type Tyk2, the mutant proteins were able to sustain the level of IFNAR1 receptor protein. However, all four mutants were incapable of restoring high-affinity interferon-alpha binding in Tyk2-negative cells and were also catalytically impaired, even when transiently overexpressed. Interferon-alpha induced phosphorylation, and gene expression could be detected in V584D- or G596V-expressing cells, but not in H669P- or R856G-expressing cells. Furthermore, H669P and R856G proteins were constitutively highly phosphorylated. All together, our findings demonstrate that an intact KL domain is essential for the intrinsic catalytic activity of Tyk2 and for the establishment of a high-affinity interferon-alpha receptor complex.

authors

Yeh TC,Dondi E,Uze G,Pellegrini S

doi

10.1073/pnas.160130297

keywords:

subject

Has Abstract

pub_date

2000-08-01 00:00:00

pages

8991-6

issue

16

eissn

0027-8424

issn

1091-6490

pii

160130297

journal_volume

97

pub_type

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