alexa Keeping the (kinase) party going: SLP-76 and ITK dance to the beat.
Immunology

Immunology

Journal of Clinical & Cellular Immunology

Author(s): Qi Q, August A

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Abstract The Tec-family protein tyrosine kinase IL-2-inducible T cell kinase (ITK) mediates T cell activation, as does the adaptor protein SLP-76 (SH2-domain-containing leukocyte protein of 76 kD), which forms a complex with ITK and other intracellular signaling enzymes. One of these enzymes is phospholipase C-gamma1 (PLC-gamma1), which mediates T cell receptor (TCR)-stimulated intracellular calcium mobilization leading to the activation of transcription factors such as nuclear factor of activated T cells. The Src-family tyrosine kinase Lck and the Syk-family tyrosine kinase zeta chain-associated protein kinase of 70 kD (ZAP-70), together with ITK, are necessary for the phosphorylation of PLC-gamma1 in response to TCR stimulation. ITK is thought to phosphorylate a specific tyrosine residue of PLC-gamma1 that is required for its activation. The mechanism of activation of ITK appears to involve the interaction between SLP-76 and ITK, which not only initiates ITK activity but is also important to maintain the kinase activity of ITK. This suggests that SLP-76 acts as more than a neutral adaptor in mediating T cell activation; SLP-76 also directly influences the kinase activity of ITK, allowing ITK to phosphorylate PLC-gamma1.
This article was published in Sci STKE and referenced in Journal of Clinical & Cellular Immunology

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