Interaction of IL-2R beta and gamma c chains with Jak1 and Jak3: implications for XSCID and XCID.
Russell SM,
Johnston JA,
Noguchi M,
Kawamura M,
Bacon CM,
Friedmann M,
Berg M,
McVicar DW,
Witthuhn BA,
Silvennoinen O, et al.
Laboratory of Molecular Immunology, National Heart, Lung, and Blood Institute, Bethesda, MD 20892.
Interleukin-2 (IL-2) signaling requires the dimerization of the IL-2 receptor beta.(IL-2R beta) and common gamma (gamma c) chains. Mutations of gamma c can result in X-linked severe combined immunodeficiency (XSCID). IL-2, IL-4, IL-7 (whose receptors are known to contain gamma c), and IL-9 (whose receptor is shown here to contain gamma c) induced the tyrosine phosphorylation and activation of the Janus family tyrosine kinases Jak1 and Jak3. Jak1 and Jak3 associated with IL-2R beta and gamma c, respectively; IL-2 induced Jak3-IL-2R beta and increased Jak3-gamma c associations. Truncations of gamma c, and a gamma c, point mutation causing moderate X-linked combined immunodeficiency (XCID), decreased gamma c-Jak3 association. Thus, gamma c mutations in at least some XSCID and XCID patients prevent normal Jak3 activation, suggesting that mutations of Jak3 may result in an XSCID-like phenotype.
PMID: 7973658 [PubMed - indexed for MEDLINE]