Signal transduction by a CD16/CD7/Jak2 fusion protein

I. Sakai, L. Nabell, Andrew Kraft

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The addition of interleukin-3 (IL-3) and granulocyte-macrophage colony- stimulating factor (GM-CSF) to hormone-dependent cells induces tyrosine phosphorylation of Janus protein kinase 2 (Jak2) and activates its in vitro kinase activity. To explore the role of Jak2 in IL-3/GM-CSF-mediated signal transduction, we constructed a CD16/CD7/Jak2 (CD16/Jak2) fusion gene containing the external domain of CD16 and the entire Jak2 molecule and expressed this fusion protein using a recombinant vaccinia virus. The clustering of CD16/Jak2 fusion protein by cross-linking with an anti-CD16 antibody induced autophosphorylation of the fusion protein but did not induce the phosphorylation of either the endogenous Jak2 or the β chain. Cross- linking of CD16/Jak2 stimulates the tyrosine phosphorylation of a large group of proteins that are also phosphorylated after the addition of IL-3 or GM- CSF and include proteins of 145, 97, 67, 52, and 42 kDa. Closer analysis demonstrated that the CD16/Jak2 phosphorylates Shc, a 52-kDa protein, and the 145-kDa protein associated tightly with Shc, as well as mitogen-associated protein kinase (pp42). Electrophoretic mobility shift assays demonstrate that CD16/Jak2 activates the ability of signal transduction and activation of transcription (STAT) proteins to bind to an inferon-γ-activated sequence oligonucleotide in a manner similar to that seen after IL-3 treatment. Cross- linking of the CD16/Jak2 protein stimulated increases in c-fos and junB similar to IL-3 but did not cause major changes in the levels of the c-myc message, which normally increases after IL-3 treatment. Thus, a transmembrane CD16/Jak2 fusion is capable of activating protein phosphorylation and mRNA transcription in a manner similar but not identical to hematopoietic growth factors.

Original languageEnglish (US)
Pages (from-to)18420-18427
Number of pages8
JournalJournal of Biological Chemistry
Volume270
Issue number31
DOIs
StatePublished - 1995
Externally publishedYes

Fingerprint

Janus Kinase 2
Signal transduction
Protein Kinases
Signal Transduction
Fusion reactions
Interleukin-3
Phosphorylation
Proteins
Granulocyte-Macrophage Colony-Stimulating Factor
Transcription
Crosslinking
Tyrosine
Electrophoretic mobility
Vaccinia virus
Gene Fusion
Electrophoretic Mobility Shift Assay
Viruses
Mitogens
Oligonucleotides
Transcriptional Activation

ASJC Scopus subject areas

  • Biochemistry

Cite this

Signal transduction by a CD16/CD7/Jak2 fusion protein. / Sakai, I.; Nabell, L.; Kraft, Andrew.

In: Journal of Biological Chemistry, Vol. 270, No. 31, 1995, p. 18420-18427.

Research output: Contribution to journalArticle

Sakai, I. ; Nabell, L. ; Kraft, Andrew. / Signal transduction by a CD16/CD7/Jak2 fusion protein. In: Journal of Biological Chemistry. 1995 ; Vol. 270, No. 31. pp. 18420-18427.
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