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Sequences of the mouse F protein alleles and identification of a T cell epitope.

Abstract：

:F protein is found predominantly in the liver and is of unknown function. The protein has been of interest to immunologists in the areas of self tolerance and the immunogenetics of the anti-F protein response. In the mouse there are two alleles (F1 and F2), and although mice are completely tolerant to the self form of the protein, mice of responder strains make a good antibody response to immunization with the non-self form. This response cross-reacts with the self form, implying firstly, that autoreactive B cells are present and that tolerance is therefore maintained at the T cell level, and secondly, that the difference between the two allelic products defines a T cell epitope. Primers based on the published sequence for rat F protein were used in the polymerase chain reaction to amplify the cDNA for the two mouse alleles. Subsequent sequencing shows a high degree of sequence identity between the rat and mouse cDNA. The two mouse cDNA are identical apart from a single A to G base change which predicts an asparagine (F1 protein) to aspartate (F2 protein) amino acid residue change. Using allele-specific oligonucleotide probes we confirmed that this base change has the same strain distribution as the previously determined F protein type. Isoelectric focusing shows that F1 protein migrates in a more basic position than F2 protein, as predicted by the asparagine to aspartate change. Finally, a synthetic peptide from the allovariable site of F2 protein will successfully restimulate T cells in vitro from an F1 type mouse primed in vivo with whole F2 protein, whereas the corresponding peptide from F1 protein will not. This is evidence that, as predicted, the allovariable site does indeed define a T cell epitope. Peptides covering the rest of the F2 protein molecule were not stimulatory.

journal_name

Eur J Immunol

journal_title

European journal of immunology

authors

Schofield JP,Vijayakumar RK,Oliveira DB

doi

10.1002/eji.1830210521

subject

Has Abstract

pub_date

1991-05-01 00:00:00

pages

1235-40

issue

5

eissn

0014-2980

issn

1521-4141

journal_volume

21

pub_type

杂志文章

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