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Using X-ray Crystallography, Biophysics, and Functional Assays to Determine the Mechanisms Governing T-cell Receptor Recognition of Cancer Antigens
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Structure-Function analysis of the CTLA-4 interaction with PP2A.

Wendy A Teft1, Thu A Chau, Joaquín Madrenas

  • 1FOCIS Centre for Clinical Immunology and Immunotherapeutics, Robarts Research Institute, The University of Western Ontario, London, Ontario, Canada. wateft@uwo.ca

BMC Immunology
|May 2, 2009
PubMed
Summary
This summary is machine-generated.

Cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) interacts with protein phosphatase 2A (PP2A) via its tail, influencing T cell activation. This interaction is crucial for inverse agonist-mediated T cell responses.

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Published on: September 28, 2018

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Signaling

Background:

  • CTLA-4 is a key inhibitor of T cell activation, but its precise mechanism of action is not fully understood.
  • The cytoplasmic tail of CTLA-4 lacks intrinsic enzymatic activity but associates with signaling molecules like protein phosphatase 2A (PP2A).
  • PP2A is a heterotrimeric enzyme composed of scaffolding (A), catalytic (C), and regulatory (B) subunits.

Purpose of the Study:

  • To investigate the interaction interface between human CTLA-4 and PP2A.
  • To determine the functional significance of the CTLA-4/PP2A interaction in T cell responses.
  • To elucidate the role of PP2A phosphatase activity in CTLA-4-mediated T cell modulation.

Main Methods:

  • Analysis of the human CTLA-4 cytoplasmic tail interaction with PP2A.
  • Site-directed mutagenesis to identify key interaction residues.
  • Assays to measure T cell activation and IL-2 production.

Main Results:

  • PP2A binds to the CTLA-4 cytoplasmic tail at two distinct sites: a lysine-rich motif and tyrosine residue 182.
  • This interaction is not essential for CTLA-4's inhibitory function but is critical for T cell activation induced by CTLA-4 inverse agonists.
  • Inverse agonists stimulated IL-2 production in an okadaic acid-dependent manner, highlighting the role of PP2A activity.

Conclusions:

  • PP2A directly interacts with the cytoplasmic tail of human CTLA-4 through specific motifs (lysine-rich motif at K155 and Y182).
  • This CTLA-4/PP2A interaction, along with PP2A's phosphatase activity, plays a significant role in CTLA-4-mediated T cell activation.
  • The findings provide new insights into the molecular mechanisms underlying CTLA-4 signaling in T cells.