The hallmark function of αβ T cell antigen receptors (TCRs) involves the highly specific co-recognition of a major histocompatibility complex molecule and its carried peptide. However, the molecular basis of the interactions of TCRs with the lipid an ...
The hallmark function of αβ T cell antigen receptors (TCRs) involves the highly specific co-recognition of a major histocompatibility complex molecule and its carried peptide. However, the molecular basis of the interactions of TCRs with the lipid antigen-presenting molecule CD1c is unknown. We identified frequent staining of human T cells with CD1c tetramers across numerous subjects. Whereas TCRs typically show high specificity for antigen, both tetramer binding and autoreactivity occurred with CD1c in complex with numerous, chemically diverse self lipids. Such extreme polyspecificity was attributable to binding of the TCR over the closed surface of CD1c, with the TCR covering the portal where lipids normally protrude. The TCR essentially failed to contact lipids because they were fully seated within CD1c. These data demonstrate the sequestration of lipids within CD1c as a mechanism of autoreactivity and point to small lipid size as a determinant of autoreactive T cell responses.
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To be added later Wun, K.S.,Rossjohn, J. () TO BE PUBLISHED --: --
Organizational Affiliation:
QIMR Berghofer Medical Research Institute, Herston, Australia.,Division of Infection and Immunity, Cardiff University, School of Medicine, Heath Park, Cardiff, UK.,Centre for Biodiscovery and Molecular Development of Therapeutics and Centre for Biosecurity and Tropical Infectious Diseases Australian Institute of Tropical Health and Medicine, James Cook University, Cairn, Australia.,Brigham and Women's Hospital Division of Rheumatology, Immunology and Allergy and Harvard Medical School, Boston, MA, USA. bmoody@bwh.harvard.edu.,ARC Centre of Excellence in Advanced Molecular Imaging, Monash University, Clayton, Victoria, Australia. jamie.rossjohn@monash.edu.,Department of Infectious Diseases and Immunology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands.,Department of Global Health and Social Medicine, and Division of Global Health Equity, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.,Infection and Immunity Program and The Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia.,Brigham and Women's Hospital Division of Rheumatology, Immunology and Allergy and Harvard Medical School, Boston, MA, USA.,Emory University School of Medicine, Atlanta, GA, USA.,Socios en Salud Sucursal Peru, Lima, Peru.,Division of Infection and Immunity, Cardiff University, School of Medicine, Heath Park, Cardiff, UK. jamie.rossjohn@monash.edu.,ARC Centre of Excellence in Advanced Molecular Imaging, University of Melbourne, Parkville, Victoria, Australia.,ARC Centre of Excellence in Advanced Molecular Imaging, Monash University, Clayton, Victoria, Australia.,Infection and Immunity Program and The Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia. jamie.rossjohn@monash.edu.,Department of Microbiology and Immunology, Peter Doherty Institute for Infection and Immunity, University of Melbourne, Parkville, Victoria, Australia.
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