Association of the EF-hand and PH domains of the guanine nucleotide exchange factor SLAT with IP3 receptor 1 promotes Ca2+ signaling in T cells

Camille Fos, Stephane Becart, Ann J.Canonigo Balancio, Darren Boehning, Amnon Altman

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

The guanine nucleotide exchange factor SLAT (SWAP-70-like adaptor of T cells) regulates T cell activation and differentiation by enabling Ca2+ release from intracellular stores in response to stimulation of the T cell receptor (TCR). We found a TCR-induced association between SLAT and inositol 1,4,5-trisphosphate (IP3) receptor type 1 (IP3R1). The N-terminal region of SLAT, which contains two EF-hand motifs that we determined bound Ca2+, and the SLAT pleckstrin homology (PH) domain independently bound to IP3R1 by associating with a conserved motif within the IP3R1 ligand-binding domain. Disruption of the SLATIP3R1 interaction with cell-permeable, IP3R1-based fusion peptides inhibited TCR-stimulated Ca2+ signaling, activation of the transcription factor NFAT (nuclear factor of activated T cells), and production of cytokines, suggesting that this interaction is required for optimal T cell activation. The finding that SLAT is an IP3R1-interacting protein required for T cell activation suggests that this interaction could be a potential target for a selective immunosuppressive drug.

Original languageEnglish (US)
Pages (from-to)ra93
JournalScience Signaling
Volume7
Issue number345
DOIs
StatePublished - Sep 30 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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