Binding and CTL recognition a leader derived, tap-dependent allo peptides on two a ueles of the class IB molecule Qa-1

Caryn Smith, Carla Aldrich

Research output: Contribution to journalArticle

Abstract

Unlike the highly polymorphic class IA molecules, (H-2K,D,L) class IB molecules (Q,T,M) display little or no polymorphism, suggesting they may play a unique role in immune responses. There are 4-6 well defined alleles of the class IB molecule Qa-1, although data suggest that additional allcles may exist. Recently, two allo peptides were described which bind to Qa-lb and are recognized by CD8+ T cells. The Qdm+ (AMAPRTLLL) and Qdm (AMVPRTLU.) peptides are derived from leader sequences of H-2D molecules, but are dependent upon the Tap transporter for presentation by Qa-lb. Studies using recombinant inbred mice suggested that Qa-P also binds and presents Qdm. Using mutagenesis and four rounds of antibody (anti-H-2d) plus complement and anti-Qa-1a specific CTL depletions, we have generated a Tap-defective cell une from the NZB derived (H-2d, Qa-la)plasmacytoma PCI 1198. Similar to what is seen for Qa-1b on the Tap-defective line RMA-S, our Qa-1a cell line, PCK. 1, is not recognized by Qdm-peptide dependent anti-Qa-1b CTL unless pre-incubated with Qdm+ peptide. However, as was seen with Qa-1b, other anti-Qa-1a CTL recognize PCK. 1 in the presence or absence of Qdm-1a. Thus, despite differences in the peptide binding pockets of Qa-1a and Qa-1b ( V/l 24, H/T 9) both alleles of Qa-1 bind Qdm+ and are recognized on Tap-defective cells. The limited functional polymorphism and unusual peptide binding of Qa-1 may be of importance to the role Qa-1 plays in the immune response.

Original languageEnglish
JournalFASEB Journal
Volume10
Issue number6
StatePublished - 1996

Fingerprint

peptides
Peptides
Molecules
Polymorphism
Alleles
plasmacytoma
immune response
genetic polymorphism
Plasmacytoma
alleles
Mutagenesis
Protein Sorting Signals
T-cells
Anti-Idiotypic Antibodies
mutagenesis
transporters
complement
T-Lymphocytes
T-lymphocytes
Cell Line

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry
  • Cell Biology

Cite this

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title = "Binding and CTL recognition a leader derived, tap-dependent allo peptides on two a ueles of the class IB molecule Qa-1",
abstract = "Unlike the highly polymorphic class IA molecules, (H-2K,D,L) class IB molecules (Q,T,M) display little or no polymorphism, suggesting they may play a unique role in immune responses. There are 4-6 well defined alleles of the class IB molecule Qa-1, although data suggest that additional allcles may exist. Recently, two allo peptides were described which bind to Qa-lb and are recognized by CD8+ T cells. The Qdm+ (AMAPRTLLL) and Qdm (AMVPRTLU.) peptides are derived from leader sequences of H-2D molecules, but are dependent upon the Tap transporter for presentation by Qa-lb. Studies using recombinant inbred mice suggested that Qa-P also binds and presents Qdm. Using mutagenesis and four rounds of antibody (anti-H-2d) plus complement and anti-Qa-1a specific CTL depletions, we have generated a Tap-defective cell une from the NZB derived (H-2d, Qa-la)plasmacytoma PCI 1198. Similar to what is seen for Qa-1b on the Tap-defective line RMA-S, our Qa-1a cell line, PCK. 1, is not recognized by Qdm-peptide dependent anti-Qa-1b CTL unless pre-incubated with Qdm+ peptide. However, as was seen with Qa-1b, other anti-Qa-1a CTL recognize PCK. 1 in the presence or absence of Qdm-1a. Thus, despite differences in the peptide binding pockets of Qa-1a and Qa-1b ( V/l 24, H/T 9) both alleles of Qa-1 bind Qdm+ and are recognized on Tap-defective cells. The limited functional polymorphism and unusual peptide binding of Qa-1 may be of importance to the role Qa-1 plays in the immune response.",
author = "Caryn Smith and Carla Aldrich",
year = "1996",
language = "English",
volume = "10",
journal = "FASEB Journal",
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TY - JOUR

T1 - Binding and CTL recognition a leader derived, tap-dependent allo peptides on two a ueles of the class IB molecule Qa-1

AU - Smith, Caryn

AU - Aldrich, Carla

PY - 1996

Y1 - 1996

N2 - Unlike the highly polymorphic class IA molecules, (H-2K,D,L) class IB molecules (Q,T,M) display little or no polymorphism, suggesting they may play a unique role in immune responses. There are 4-6 well defined alleles of the class IB molecule Qa-1, although data suggest that additional allcles may exist. Recently, two allo peptides were described which bind to Qa-lb and are recognized by CD8+ T cells. The Qdm+ (AMAPRTLLL) and Qdm (AMVPRTLU.) peptides are derived from leader sequences of H-2D molecules, but are dependent upon the Tap transporter for presentation by Qa-lb. Studies using recombinant inbred mice suggested that Qa-P also binds and presents Qdm. Using mutagenesis and four rounds of antibody (anti-H-2d) plus complement and anti-Qa-1a specific CTL depletions, we have generated a Tap-defective cell une from the NZB derived (H-2d, Qa-la)plasmacytoma PCI 1198. Similar to what is seen for Qa-1b on the Tap-defective line RMA-S, our Qa-1a cell line, PCK. 1, is not recognized by Qdm-peptide dependent anti-Qa-1b CTL unless pre-incubated with Qdm+ peptide. However, as was seen with Qa-1b, other anti-Qa-1a CTL recognize PCK. 1 in the presence or absence of Qdm-1a. Thus, despite differences in the peptide binding pockets of Qa-1a and Qa-1b ( V/l 24, H/T 9) both alleles of Qa-1 bind Qdm+ and are recognized on Tap-defective cells. The limited functional polymorphism and unusual peptide binding of Qa-1 may be of importance to the role Qa-1 plays in the immune response.

AB - Unlike the highly polymorphic class IA molecules, (H-2K,D,L) class IB molecules (Q,T,M) display little or no polymorphism, suggesting they may play a unique role in immune responses. There are 4-6 well defined alleles of the class IB molecule Qa-1, although data suggest that additional allcles may exist. Recently, two allo peptides were described which bind to Qa-lb and are recognized by CD8+ T cells. The Qdm+ (AMAPRTLLL) and Qdm (AMVPRTLU.) peptides are derived from leader sequences of H-2D molecules, but are dependent upon the Tap transporter for presentation by Qa-lb. Studies using recombinant inbred mice suggested that Qa-P also binds and presents Qdm. Using mutagenesis and four rounds of antibody (anti-H-2d) plus complement and anti-Qa-1a specific CTL depletions, we have generated a Tap-defective cell une from the NZB derived (H-2d, Qa-la)plasmacytoma PCI 1198. Similar to what is seen for Qa-1b on the Tap-defective line RMA-S, our Qa-1a cell line, PCK. 1, is not recognized by Qdm-peptide dependent anti-Qa-1b CTL unless pre-incubated with Qdm+ peptide. However, as was seen with Qa-1b, other anti-Qa-1a CTL recognize PCK. 1 in the presence or absence of Qdm-1a. Thus, despite differences in the peptide binding pockets of Qa-1a and Qa-1b ( V/l 24, H/T 9) both alleles of Qa-1 bind Qdm+ and are recognized on Tap-defective cells. The limited functional polymorphism and unusual peptide binding of Qa-1 may be of importance to the role Qa-1 plays in the immune response.

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