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. 1992 Jun 1;89(11):5138–5141. doi: 10.1073/pnas.89.11.5138

Divergent viral superantigens delete V beta 5+ T lymphocytes.

K J Gollob 1, E Palmer 1
PMCID: PMC49244  PMID: 1317583

Abstract

Several murine superantigens in association with class II major histocompatibility complex proteins have been shown to cause the deletion of T cells based on the expression of particular beta-chain variable region (V beta) gene segments. We have previously shown that mice expressing the Etc-1 superantigen, encoded by an open reading frame within the 3' long terminal repeat of the endogenous mouse mammary tumor provirus (Mtv), Mtv-9, delete T cells expressing either V beta 5 or V beta 11 gene segments. Comparison of several Mtv 3' long terminal repeat open reading frame sequences has indicated that the carboxyl terminus likely encodes the V beta specificity of these proteins. Our analysis of C57BL/6 x DBA/2 recombinant inbred strains of mouse revealed three Mtv-9-negative strains that nevertheless have a low frequency of V beta 5-expressing T cells. Here we demonstrate that a second endogenous superantigen, responsible for the deletion of V beta 5-bearing T cells, is encoded by a gene mapping to Mtv-6 on chromosome 16. Surprisingly, the carboxyl-terminal sequences of the Mtv-6 and -9 superantigens are extremely divergent, in spite of the fact that they both mediate the deletion of V beta 5+ lymphocytes.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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