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Mol. Cell. Biol., 06 1995, 3336-3343, Vol 15, No. 6
FW Quelle, K Shimoda, W Thierfelder, C Fischer, A Kim, SM Ruben, JL Cleveland, JH Pierce, AD Keegan and K Nelms
By searching a database of expressed sequences, we identified a member of
the signal transducers and activators of transcription (Stat) family of
proteins. Human and murine full-length cDNA clones were obtained and
sequenced. The sequence of the human cDNA was identical to the recently
published sequence for interleukin-4 (IL-4)-Stat (J. Hou, U. Schindler,
W.J. Henzel, T.C. Ho, M. Brasseur, and S. L. McKnight, Science 265:1701-
1706, 1994), while the murine Stat6 amino acid and nucleotide sequences
were 83 and 84% identical to the human sequences, respectively. Using
Stat6-specific antiserum, we demonstrated that Stat6 is rapidly tyrosine
phosphorylated following stimulation of appropriate cell lines with IL-4 or
IL-3 but is not detectably phosphorylated following stimulation with IL-2,
IL-12, or erythropoietin. In contrast, IL-2, IL- 3, and erythropoietin
induce the tyrosine phosphorylation of Stat5 while IL-12 uniquely induces
the tyrosine phosphorylation of Stat4. Inducible tyrosine phosphorylation
of Stat6 requires the membrane- distal region of the IL-4 receptor alpha
chain. This region of the receptor is not required for cell growth,
demonstrating that Stat6 tyrosine phosphorylation does not contribute to
mitogenesis.
Copyright © 1995, American Society for Microbiology
Cloning of murine Stat6 and human Stat6, Stat proteins that are tyrosine phosphorylated in responses to IL-4 and IL-3 but are not required for mitogenesis
Department of Biochemistry, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.
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