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Multi-scale simulations of the T cell receptor reveal its lipid interactions, dynamics and the arrangement of its cytoplasmic region
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Multi-scale simulations of the T cell receptor reveal its lipid interactions, dynamics and the arrangement of its cytoplasmic region
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Journal Article
Multi-scale simulations of the T cell receptor reveal its lipid interactions, dynamics and the arrangement of its cytoplasmic region
2021
Overview
The T cell receptor (TCR-CD3) initiates T cell activation by binding to peptides of Major Histocompatibility Complexes (pMHC). The TCR-CD3 topology is well understood but the arrangement and dynamics of its cytoplasmic tails remains unknown, limiting our grasp of the signalling mechanism. Here, we use molecular dynamics simulations and modelling to investigate the entire TCR-CD3 embedded in a model membrane. Our study demonstrates conformational changes in the extracellular and transmembrane domains, and the arrangement of the TCR-CD3 cytoplasmic tails. The cytoplasmic tails formed highly interlaced structures while some tyrosines within the immunoreceptor tyrosine-based activation motifs (ITAMs) penetrated the hydrophobic core of the membrane. Interactions between the cytoplasmic tails and phosphatidylinositol phosphate lipids in the inner membrane leaflet led to the formation of a distinct anionic lipid fingerprint around the TCR-CD3. These results increase our understanding of the TCR-CD3 dynamics and the importance of membrane lipids in regulating T cell activation.
Publisher
Public Library of Science,Public Library of Science (PLoS)
Subject
/ Humans
/ Identification and classification
/ Lipids
/ Medicine and Health Sciences
/ Membrane Lipids - metabolism
/ Molecular Dynamics Simulation
/ Peptides
/ Protein Interaction Domains and Motifs
/ Receptor-CD3 Complex, Antigen, T-Cell - chemistry
/ Receptor-CD3 Complex, Antigen, T-Cell - metabolism
/ Receptor-CD3 Complex, Antigen, T-Cell - ultrastructure
/ Research and Analysis Methods
/ T cells
/ Topology
/ Tyrosine
