A novel Src homology 2 domain-containing molecule, Src-like adapter protein-2 (SLAP-2), which negatively regulates T cell receptor signaling

Akhilesh Pandey, Nieves Ibarrola, Irina Kratchmarova, Minerva M. Fernandez, Stefan N. Constantinescu, Osamu Ohara, Sansana Sawasdikosol, Harvey F. Lodish, Mat Thias Mann

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

We have cloned a novel adapter protein containing Src homology 2 and Src homology 3 domains similar to the Src family of tyrosine kinases. This molecule lacks a catalytic tyrosine kinase domain and is related to a previously identified protein, Src-like adapter protein (SLAP), and is therefore designated SLAP-2. Northern blot analysis indicates that SLAP-2 is predominantly expressed in the immune system. Jurkat T cells express SLAP-2 protein and overexpression of SLAP-2 in these cells negatively regulates T cell receptor signaling as assessed by interleukin-2 promoter or NF-AT promoter reporter constructs. Mutational analysis revealed that an intact SH2 domain of SLAP-2 is essential for this inhibitory effect, whereas mutation of the SH3 domain alone has no effect. This inhibitory effect is upstream of the activation of Ras and increase of intracellular calcium levels, as no inhibition was observed when the cells were activated by phorbol ester plus ionomycin. SLAP-2 interacts with Cbl in vivo in a phosphorylation independent manner and with ZAP-70 and T cell receptor ζ chain upon T cell receptor activation. Finally, we show that the mutation of a predicted myristoylation site within the NH2-terminal of SLAP-2 is essential for its inhibitory effect. This report therefore implicates SLAP and SLAP-2 as a family of adapter proteins that negatively regulate T cell receptor signaling.

Original languageEnglish (US)
Pages (from-to)19131-19138
Number of pages8
JournalJournal of Biological Chemistry
Volume277
Issue number21
DOIs
StatePublished - May 24 2002

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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