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Journal articles
Cutting edge: Dok-1 and Dok-2 adaptor molecules are regulated by phosphatidylinositol 5-phosphate production in T cells.: Dok-1 and Dok-2 PH domains / PtdIns5P interactions
Abstract : Downstream of tyrosine kinase (Dok) proteins Dok-1 and Dok-2 are involved in T cell homeostasis maintenance. Dok protein tyrosine phosphorylation plays a key role in establishing negative feedback loops of T cell signaling. These structurally related adapter molecules contain a pleckstrin homology (PH) domain generally acting as a lipid/protein-interacting module. We show that the presence of this PH domain is necessary for the tyrosine phosphorylation of Dok proteins and their negative functions in T cells. We find that Dok-1/Dok-2 PH domains bind in vitro to the rare phosphoinositide species, phosphatidylinositol 5-phosphate (PtdIns5P). Dok tyrosine phosphorylation correlates with PtdIns5P production in T cells upon TCR triggering. Furthermore, we demonstrate that PtdIns5P increase regulates Dok tyrosine phosphorylation in vivo. Together, our data identify a novel lipid mediator in T cell signaling and suggest that PH-PtdIns5P interactions regulate T cell responses.
Mots-clés :
adapter molecules
phosphoinositides
Cited literature [18 references]
https://www.hal.inserm.fr/inserm-00364224
Contributor : Jacques Nunès <>
Submitted on : Monday, March 23, 2009 - 11:30:50 AM
Last modification on : Thursday, February 18, 2021 - 3:32:02 PM
Long-term archiving on: : Tuesday, June 8, 2010 - 9:08:38 PM
Contributor : Jacques Nunès <>
Submitted on : Monday, March 23, 2009 - 11:30:50 AM
Last modification on : Thursday, February 18, 2021 - 3:32:02 PM
Long-term archiving on: : Tuesday, June 8, 2010 - 9:08:38 PM
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25596_1_merged_1233316915.pdf
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