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Transmembrane adapters: structure, biochemistry and biology.
Stefanie Kliche1, Jonathan A Lindquist, Burkhart Schraven
1Institute of Immunology, Otto-von Guericke-University, Leipziger Strasse 44, 39120 Magdeburg, Germany.
Seminars in Immunology
|November 16, 2004
Summary
Transmembrane adapter proteins (TRAPs) are unique signaling molecules in blood cells. They lack enzymatic activity but recruit other molecules to regulate lymphocyte function.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Transmembrane adapter proteins (TRAPs) are a distinct class of signaling molecules found in hematopoietic cells.
- Unlike other signaling proteins, TRAPs do not possess enzymatic or transcriptional activity.
- Their structure is characterized by multiple tyrosine-based signaling motifs (TBSMs).
Purpose of the Study:
- To elucidate the role and mechanism of Transmembrane adapter proteins (TRAPs) in immune cell signaling.
- To understand how TRAPs mediate the recruitment of cytosolic molecules to immunoreceptors.
- To explore the contribution of TRAPs to the modulation of lymphocyte function.
Main Methods:
- Investigated the phosphorylation of TRAPs by Src-, Syk-, and Tec-family protein tyrosine kinases.
- Analyzed the recruitment of cytosolic adapter and effector molecules via TRAP SH2-domains.
- Studied the impact of TRAP-mediated signaling on lymphocyte-specific signal transduction pathways.
Main Results:
- Triggering of immunoreceptors leads to tyrosine phosphorylation of TRAPs.
- Phosphorylated TRAPs effectively recruit cytosolic molecules through their SH2-domains.
- TRAPs position recruited molecules near immunoreceptors to coordinate signaling.
Conclusions:
- Transmembrane adapter proteins (TRAPs) are crucial adaptors in hematopoietic cell signaling.
- TRAPs play a key role in modulating signal transduction pathways essential for lymphocyte function.
- TRAPs act as scaffolds, bringing signaling components into proximity to regulate immune responses.