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T cell recognition of distinct peptide: I-Au conformers in murine experimental autoimmune encephalomyelitis

T cell recognition of distinct peptide: I-Au conformers in murine experimental autoimmune encephalomyelitis
T cell recognition of distinct peptide: I-Au conformers in murine experimental autoimmune encephalomyelitis

We have used T cells bearing TCRs that are closely related in sequence as probes to detect conformational variants of peptide-MHC complexes in murine experimental autoimmune encephalomyelitis in H-2u mice. The N-terminal epitope of myelin basic protein (MBP) is immunodominant in this model. Our studies have primarily focused on T cell recognition of a position 4 analog of this peptide (MBP1-9[4Y]) complexed with I-Au. Using site-directed mutagenesis, we have mapped the functionally important complementarity determining region residues of the 1934.4 TCR Vα domain. One of the resulting mutants (Tyr95 to alanine in CDR3α, Y95A) has interesting properties: relative to the parent wild-type TCR, this mutant poorly recognizes Ag complexes generated by pulsing professional APCs (PL-8 cells) with MBP1-9[4Y] while retaining recognition of MBP1-9[4Y]-pulsed unconventional APCs or insect cell-expressed complexes of I-Au containing tethered MBP1-9[4Y]. Insect cell expression of recombinant I-A u with covalently tethered class II-associated invariant chain peptide or other peptides which bind relatively weakly, followed by proteolytic cleavage of the peptide linker and replacement by MBP1-9[4Y] in vitro, results in complexes that resemble peptide-pulsed PL-8 cells. Therefore, the distinct conformers can be produced in recombinant form. T cells that can distinguish these two conformers can also be generated by the immunization of H-2 u mice, indicating that differential recognition of the conformers is observed for responding T cells in vivo. These studies have relevance to understanding the molecular details of T cell recognition in murine experimental autoimmune encephalomyelitis. They are also of particular importance for the effective use of multimeric peptide-MHC complexes to characterize the properties of Ag-specific T cells.

0022-1767
2467-2477
Huang, Jason C.
7138e9eb-f141-4332-ba52-4941904880ae
Han, Mei
94e2baee-f8b0-4bd9-9e5b-83d33f464683
Minguela, Alfredo
89d0d2bb-fdfb-47ad-b925-4c0687ede7ae
Pastor, Silvia
2a71073b-f534-4b18-8eaa-de9030d4bf27
Qadri, Ayub
c31c2ac2-aaa5-4236-907c-a96dfbc598e8
Ward, E. Sally
b31c0877-8abe-485f-b800-244a9d3cd6cc
Huang, Jason C.
7138e9eb-f141-4332-ba52-4941904880ae
Han, Mei
94e2baee-f8b0-4bd9-9e5b-83d33f464683
Minguela, Alfredo
89d0d2bb-fdfb-47ad-b925-4c0687ede7ae
Pastor, Silvia
2a71073b-f534-4b18-8eaa-de9030d4bf27
Qadri, Ayub
c31c2ac2-aaa5-4236-907c-a96dfbc598e8
Ward, E. Sally
b31c0877-8abe-485f-b800-244a9d3cd6cc

Huang, Jason C., Han, Mei, Minguela, Alfredo, Pastor, Silvia, Qadri, Ayub and Ward, E. Sally (2003) T cell recognition of distinct peptide: I-Au conformers in murine experimental autoimmune encephalomyelitis. Journal of Immunology, 171 (5), 2467-2477. (doi:10.4049/jimmunol.171.5.2467).

Record type: Article

Abstract

We have used T cells bearing TCRs that are closely related in sequence as probes to detect conformational variants of peptide-MHC complexes in murine experimental autoimmune encephalomyelitis in H-2u mice. The N-terminal epitope of myelin basic protein (MBP) is immunodominant in this model. Our studies have primarily focused on T cell recognition of a position 4 analog of this peptide (MBP1-9[4Y]) complexed with I-Au. Using site-directed mutagenesis, we have mapped the functionally important complementarity determining region residues of the 1934.4 TCR Vα domain. One of the resulting mutants (Tyr95 to alanine in CDR3α, Y95A) has interesting properties: relative to the parent wild-type TCR, this mutant poorly recognizes Ag complexes generated by pulsing professional APCs (PL-8 cells) with MBP1-9[4Y] while retaining recognition of MBP1-9[4Y]-pulsed unconventional APCs or insect cell-expressed complexes of I-Au containing tethered MBP1-9[4Y]. Insect cell expression of recombinant I-A u with covalently tethered class II-associated invariant chain peptide or other peptides which bind relatively weakly, followed by proteolytic cleavage of the peptide linker and replacement by MBP1-9[4Y] in vitro, results in complexes that resemble peptide-pulsed PL-8 cells. Therefore, the distinct conformers can be produced in recombinant form. T cells that can distinguish these two conformers can also be generated by the immunization of H-2 u mice, indicating that differential recognition of the conformers is observed for responding T cells in vivo. These studies have relevance to understanding the molecular details of T cell recognition in murine experimental autoimmune encephalomyelitis. They are also of particular importance for the effective use of multimeric peptide-MHC complexes to characterize the properties of Ag-specific T cells.

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More information

Accepted/In Press date: 24 June 2003
e-pub ahead of print date: 19 August 2003
Published date: 1 September 2003

Identifiers

Local EPrints ID: 425146
URI: http://eprints.soton.ac.uk/id/eprint/425146
ISSN: 0022-1767
PURE UUID: 50754857-bc4a-4e18-afb3-7f59f80e2f54
ORCID for E. Sally Ward: ORCID iD orcid.org/0000-0003-3232-7238

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Date deposited: 11 Oct 2018 16:30
Last modified: 16 Mar 2024 04:37

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Contributors

Author: Jason C. Huang
Author: Mei Han
Author: Alfredo Minguela
Author: Silvia Pastor
Author: Ayub Qadri
Author: E. Sally Ward ORCID iD

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