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2017 ; 198
(5
): 2017-2027
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Antigen Processing in the Endoplasmic Reticulum Is Monitored by Semi-Invariant ??
TCRs Specific for a Conserved Peptide-Qa-1(b) MHC Class Ib Ligand
#MMPMID28108559
Guan J
; Yang SJ
; Gonzalez F
; Yin Y
; Shastri N
J Immunol
2017[Mar]; 198
(5
): 2017-2027
PMID28108559
show ga
Ag processing in the endoplasmic reticulum (ER) by the ER aminopeptidase
associated with Ag processing (ERAAP) is central to presentation of a normal
peptide-MHC class I (MHC I) repertoire. Alternations in ERAAP function cause
dramatic changes in the MHC I-presented peptides, which elicit potent immune
responses. An unusual subset of CD8(+) T cells monitor normal Ag processing by
responding to a highly conserved FL9 peptide that is presented by Qa-1(b), a
nonclassical MHC Ib molecule (QFL) in ERAAP-deficient cells. To understand the
structural basis for recognition of the conserved ligand, we analyzed the ?? TCRs
of QFL-specific T cells. Individual cells in normal wild-type and TCR?-transgenic
mice were assessed for QFL-specific TCR ?- and ?-chains. The QFL-specific cells
expressed a predominant semi-invariant TCR generated by DNA rearrangement of
TRAV9d-3-TRAJ21 ?-chain and TRBV5-TRBD1-TRBJ2-7 ?-chain gene segments.
Furthermore, the CDR3 regions of the ?- as well as ?-chains were required for QFL
ligand recognition. Thus, the ?? TCRs used to recognize the peptide-Qa-1 ligand
presented by ERAAP-deficient cells are semi-invariant and likely reflect a
conserved mechanism for monitoring the fidelity of Ag processing in the ER.
|*Antigen Presentation
[MESH]
|Animals
[MESH]
|Antigens/metabolism
[MESH]
|CD8-Positive T-Lymphocytes/*immunology
[MESH]
|Cells, Cultured
[MESH]
|Conserved Sequence
[MESH]
|Endoplasmic Reticulum/*metabolism
[MESH]
|Genetic Variation
[MESH]
|Histocompatibility Antigens Class I/metabolism
[MESH]