Article (Scientific journals)
Lipid raft targeting of hematopoietic protein tyrosine phosphatase by protein kinase C theta-mediated phosphorylation.
Nika, Konstantina; Charvet, Celine; Williams, Scott et al.
2006In Molecular and Cellular Biology, 26 (5), p. 1806-16
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Keywords :
Animals; Catalytic Domain; Extracellular Signal-Regulated MAP Kinases/metabolism; Humans; Intracellular Signaling Peptides and Proteins/genetics/metabolism; Isoenzymes/genetics/metabolism; Jurkat Cells/immunology/metabolism; Membrane Microdomains/metabolism; Mice; Phosphorylation; Protein Kinase C/genetics/metabolism; Protein Tyrosine Phosphatases/genetics/metabolism; Protein Tyrosine Phosphatases, Non-Receptor; Receptors, Antigen, T-Cell/genetics/metabolism; Serine/metabolism; Signal Transduction; T-Lymphocytes/immunology/metabolism; Transgenes
Abstract :
[en] Protein kinase C theta (PKC theta) is unique among PKC isozymes in its translocation to the center of the immune synapse in T cells and its unique downstream signaling. Here we show that the hematopoietic protein tyrosine phosphatase (HePTP) also accumulates in the immune synapse in a PKC theta-dependent manner upon antigen recognition by T cells and is phosphorylated by PKC theta at Ser-225, which is required for lipid raft translocation. Immune synapse translocation was completely absent in antigen-specific T cells from PKC theta-/- mice. In intact T cells, HePTP-S225A enhanced T-cell receptor (TCR)-induced NFAT/AP-1 transactivation, while the acidic substitution mutant was as efficient as wild-type HePTP. We conclude that HePTP is phosphorylated in the immune synapse by PKC theta and thereby targeted to lipid rafts to temper TCR signaling. This represents a novel mechanism for the active immune synapse recruitment and activation of a phosphatase in TCR signaling.
Disciplines :
Immunology & infectious disease
Biochemistry, biophysics & molecular biology
Author, co-author :
Nika, Konstantina
Charvet, Celine
Williams, Scott
Tautz, Lutz
Bruckner, Shane
Rahmouni, Souad  ;  Université de Liège - ULiège > Département des sciences cliniques > Immunopathologie - Transplantation
Bottini, Nunzio
Schoenberger, Stephen P
Baier, Gottfried
Altman, Amnon
Mustelin, Tomas
Language :
English
Title :
Lipid raft targeting of hematopoietic protein tyrosine phosphatase by protein kinase C theta-mediated phosphorylation.
Publication date :
2006
Journal title :
Molecular and Cellular Biology
ISSN :
0270-7306
eISSN :
1098-5549
Publisher :
American Society for Microbiology (ASM), Washington, United States - District of Columbia
Volume :
26
Issue :
5
Pages :
1806-16
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 27 January 2009

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