Journal
JOURNAL OF IMMUNOLOGY
Volume 168, Issue 10, Pages 5070-5078Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.168.10.5070
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Funding
- NCI NIH HHS [R01-CA75174] Funding Source: Medline
- NIAID NIH HHS [P01-AI 39671] Funding Source: Medline
- NINDS NIH HHS [R01-NS35685] Funding Source: Medline
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The catalytic subunit of the serine/threonine phosphatase 2A (MA) can interact with the cytoplasmic tail of CTLA-4. However, the molecular basis and the biological significance of this interaction are unknown. In this study, we report that the regulatory subunit of PP2A (PP2AA) also interacts with the cytoplasmic tail of CTLA-4. Interestingly, TCR ligation induces tyrosine phosphorylation of PP2AA and its dissociation from CTLA-4 when coligated. The association between PP2AA and CTLA-4 involves a conserved three-lysine motif in the juxtamembrane portion of the cytoplasmic tail of CTLA-4. Mutations of these lysine residues prevent the binding of PP2AA and enhance the inhibition of IL-2 gene transcription by CTLA-4, indicating that PP2A represses CTLA-4 function. Our data imply that the lysine-rich motif in CTLA-4 may be used to identify small molecules that block its binding to PP2A and act as agonists for CTLA-4 function.
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