LIME

Author:

Brdičková Naděžda1,Brdička Tomáš1,Angelisová Pavla1,Horváth Ondrej1,Špička Jiří1,Hilgert Ivan1,Pačes Jan1,Simeoni Luca2,Kliche Stefanie2,Merten Camilla2,Schraven Burkhart2,Hořejší Václav1

Affiliation:

1. Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, 142 20 Prague 4, Czech Republic

2. Institute for Immunology, Otto-von-Guericke-University, 39120 Magdeburg, Germany

Abstract

Lymphocyte membrane rafts contain molecules critical for immunoreceptor signaling. Here, we report identification of a new raft-associated adaptor protein LIME (Lck-interacting molecule) expressed predominantly in T lymphocytes. LIME becomes tyrosine phosphorylated after cross-linking of the CD4 or CD8 coreceptors. Phospho-LIME associates with the Src family kinase Lck and its negative regulator, Csk. Ectopic expression of LIME in Jurkat T cells results in an increase of Csk in lipid rafts, increased phosphorylation of Lck and higher Ca2+ response to CD3 stimulation. Thus, LIME appears to be involved in regulation of T cell activation by coreceptors.

Publisher

Rockefeller University Press

Subject

Immunology,Immunology and Allergy

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