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Sideways lipid presentation by the antigen-presenting molecule CD1c.

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CD1c presents bulky lipids, like gangliosides, sideways in its cleft, enabling autoreactive T-cell receptor (TCR) recognition. This dual-presentation mechanism differs from other antigen-presenting molecules.

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Area of Science:

  • Immunology
  • Structural Biology
  • Biochemistry

Background:

  • CD1 proteins present lipid antigens to T cells.
  • Autoreactive T cells can recognize self-lipids presented by CD1.
  • The structural basis for CD1c-lipid-TCR interactions is not fully understood.

Purpose of the Study:

  • To elucidate the mechanism by which CD1c presents bulky lipids to autoreactive T cells.
  • To determine the structural basis of CD1c-ganglioside-TCR complex formation.
  • To investigate the role of CD1c's conserved side portal in antigen presentation.

Main Methods:

  • Mass spectrometry analysis of endogenous lipids bound by CD1c.
  • Crystal structure determination of CD1c presenting gangliosides.
  • Ex vivo studies of T cell recognition.

Main Results:

  • CD1c binds lipids with bulky headgroups that do not fit the canonical binding site.
  • A novel mechanism reveals CD1c presents two lipids simultaneously, one from the top and another sideways.
  • Sideways-oriented gangliosides presented via a conserved side portal facilitate autoreactive T cell receptor binding.
  • Ex vivo data confirm sideways-presented gangliosides as TCR recognition determinants.

Conclusions:

  • CD1c employs a unique dual-lipid presentation mechanism, utilizing a side portal to present bulky lipids.
  • This mechanism allows for autoreactive T cell recognition of self-lipids, challenging existing models of antigen presentation.
  • The findings reveal CD1c as a distinct antigen-presenting molecule with implications for understanding autoimmunity and immune responses.