Functional activation of Jak1 and Jak3 by selective association with IL-2 receptor subunits.
The interleukin-2 receptor (IL-2R) consists of three subunits: the IL-2R alpha, IL-2R beta, and IL-2R gamma chains, the last of which is also used in the receptors for IL-4, IL-7, and IL-9. Stimulation with IL-2 induces the tyrosine phosphorylation and activation of the Janus kinases Jak1 and Jak3. Jak1 and Jak3 were found to be selectively associated with the "serine-rich" region of IL-2R beta and the carboxyl-terminal region of IL-2R gamma, respectively. Both regions were necessary for IL-2 signaling. Furthermore, Jak3-negative fibroblasts expressing reconstituted IL-2R became responsive to IL-2 after the additional expression of Jak3 complementary DNA. Thus, activation of Jak1 and Jak3 may be a key event in IL-2 signaling.
Institute for Molecular and Cellular Biology, Osaka University, Japan.
T
T
Miyazaki
A
A
Kawahara
H
H
Fujii
Y
Y
Nakagawa
Y
Y
Minami
Z J
ZJ
Liu
I
I
Oishi
O
O
Silvennoinen
B A
BA
Witthuhn
J N
JN
Ihle
D000818:Animals; D002460:Cell Line; D004789:Enzyme Activation; D006801:Humans; D007376:Interleukin-2 / Q000494:pharmacology*; D053613:Janus Kinase 1; D053616:Janus Kinase 3; D011505:Protein-Tyrosine Kinases / Q000378:metabolism*; D015375:Receptors, Interleukin-2 / Q000737:chemistry / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000378:metabolism; D015398:Signal Transduction; D014443:Tyrosine / Q000378:metabolism
D007376:Interleukin-2; D015375:Receptors, Interleukin-2; D011993:Recombinant Fusion Proteins; D014443:Tyrosine; D011505:Protein-Tyrosine Kinases; C507904:JAK1 protein, human; C507933:JAK3 protein, human; D053613:Janus Kinase 1; D053616:Janus Kinase 3