Stoichiometry and intracellular fate of TRIM-containing TCR complexes

Mahima Swamy1, Gabrielle M. Siegers1, Gina J. Fiala1, Éva D. Molnár1, Elaine P. Dopfer1, Paul Fisch2, Burkhart Schraven3, Wolfgang W. A. Schamel1
1Department of Molecular Immunology, Max Planck-Institute of Immunobiology and Institute for Biology III, Albert Ludwigs University Freiburg, Stübeweg 51, Freiburg, 79108, Germany
2Department of Pathology, University of Freiburg Medical Center, Freiburg, 79110, Germany
3Institute of Molecular and Clinical Immunology, Otto-von-Guericke-Universität Magdeburg, Leipziger Strasse 44, Magdeburg, 39120, Germany

Tóm tắt

AbstractBackgroundStudying the stoichiometry and intracellular trafficking of the T cell antigen receptor (TCR) is pivotal in understanding its mechanisms of activation. The αβTCR includes the antigen-binding TCRαβ heterodimer as well as the signal transducing CD3εγ, CD3εδ and ζ2subunits. Although the TCR-interacting molecule (TRIM) is also part of the αβTCR complex, it has not been included in most reports so far.ResultsWe used the native antibody-based mobility shift (NAMOS) assay in a first dimension (1D) blue native (BN)-PAGE and a 2D BN-/BN-PAGE to demonstrate that the stoichiometry of the digitonin-solublized TRIM-containing αβTCR is TCRαβCD3ε2γδζ2TRIM2. Smaller αβTCR complexes possess a TCRαβ CD3ε2γδζ2stoichiometry. Complexes of these sizes were detected in T cell lines as well as in primary human and mouse T cells. Stimulating the αβTCR with anti-CD3 antibodies, we demonstrate by confocal laser scanning microscopy that CD3ε colocalizes with ζ and both are degraded upon prolonged stimulation, possibly within the lysosomal compartment. In contrast, a substantial fraction of TRIM does not colocalize with ζ. Furthermore, TRIM neither moves to lysosomes nor is degraded. Immunoprecipitation studies and BN-PAGE indicate that TRIM also associates with the γδTCR.ConclusionsSmall αβTCR complexes have a TCRαβ CD3ε2γδζ2stoichiometry; whereas those associated with one TRIM dimer are TCRαβ CD3ε2γδζ2TRIM2. TRIM is differentially processed compared to CD3 and ζ subunits after T cell activation and is not degraded. The γδTCR also associates with TRIM.

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