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Related Experiment Video

Updated: Mar 26, 2026

Induced Differentiation of M Cell-like Cells in Human Stem Cell-derived Ileal Enteroid Monolayers
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What Makes MAITs Wait?

Mark A Exley1

  • 1Manchester Collaborative Center for Inflammation Research, University of Manchester, Manchester M13 9NT, UK; Gastroenterology, Brigham & Women's Hospital, Harvard Medical School, Boston 02115, MA, USA; Agenus, Inc., Lexington, MA 02421, USA.

Immunity
|January 21, 2016
PubMed
Summary

Mucosal-associated invariant T (MAIT) cells use their T cell receptors (TCRs) to recognize microbial antigens. This study reveals the structural basis of MR1-TCR interactions, crucial for MAIT cell activation.

Area of Science:

  • Immunology
  • Structural Biology
  • Microbiology

Background:

  • Mucosal-associated invariant T (MAIT) cells are crucial immune cells that recognize microbial products.
  • MAIT cells detect non-peptidic antigens presented by the Major Histocompatibility Complex (MHC) class I-related molecule MR1.
  • Understanding the interaction between MR1 and T cell receptors (TCRs) is key to elucidating MAIT cell function.

Purpose of the Study:

  • To determine the co-crystal structures of MR1 bound to TCRs from different MAIT cell populations.
  • To provide structural insights into the molecular recognition mechanisms of MAIT cells.

Main Methods:

  • X-ray crystallography was used to obtain co-crystal structures.
  • Purified MR1-antigen complexes were crystallized in the presence of specific TCRs.

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  • Structural analysis was performed using computational modeling and visualization tools.

    • Main Results:

    • The study presents co-crystal structures of MR1 complexed with TCRs from two distinct classes of MAIT-type cells.
    • These structures reveal the specific binding interfaces and orientations of TCRs on the MR1 molecule.
    • Detailed structural information elucidates how MAIT cell TCRs engage with the MR1-antigen complex.

    Conclusions:

    • The elucidated structures provide a molecular basis for MR1-restricted T cell recognition.
    • These findings advance our understanding of MAIT cell antigen presentation and activation pathways.
    • The structural data will facilitate the design of novel immunotherapies targeting MAIT cells.