Title : A conserved motif in the ITK PH-domain is required for phosphoinositide binding and TCR signaling but dispensable for adaptor protein interactions.

Pub. Date : 2012

PMID : 23028816






5 Functional Relationships(s)
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1 Binding of the membrane phospholipid phosphatidylinositol 3,4,5-trisphosphate (PIP(3)) to the Pleckstrin Homology (PH) domain of the Tec family protein tyrosine kinase, Inducible T cell Kinase (ITK), is critical for the recruitment of the kinase to the plasma membrane and its co-localization with the TCR-CD3 molecular complex. pip(3) IL2 inducible T cell kinase Homo sapiens
2 Binding of the membrane phospholipid phosphatidylinositol 3,4,5-trisphosphate (PIP(3)) to the Pleckstrin Homology (PH) domain of the Tec family protein tyrosine kinase, Inducible T cell Kinase (ITK), is critical for the recruitment of the kinase to the plasma membrane and its co-localization with the TCR-CD3 molecular complex. pip(3) IL2 inducible T cell kinase Homo sapiens
3 We found that FYF triple mutation inhibits the TCR-induced production of IL-4 by impairing ITK binding to PIP(3), reducing ITK membrane recruitment, inducing conformational changes at the T cell-APC contact site, and compromising phosphorylation of ITK and subsequent phosphorylation of PLCgamma(1). pip(3) IL2 inducible T cell kinase Homo sapiens
4 Thus, the FYF mutation uncouples PIP(3)-mediated ITK membrane recruitment from the interactions of the kinase with key components of the TCR signalosome and abrogates ITK function in T cells. pip(3) IL2 inducible T cell kinase Homo sapiens
5 Thus, the FYF mutation uncouples PIP(3)-mediated ITK membrane recruitment from the interactions of the kinase with key components of the TCR signalosome and abrogates ITK function in T cells. pip(3) IL2 inducible T cell kinase Homo sapiens