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Protein Sci. 1994 Aug;3(8):1341-3.

Extending the B7 (CD80) gene family.

Author information

1
Bristol-Myers Squibb Pharmaceutical Research Institute, Seattle, Washington 98121.

Abstract

B7-1 and B7-2 are members of the immunoglobulin superfamily (IgSF) and important regulators of T cell-mediated immune responses. Despite sharing only limited sequence identity, B7-1 and B7-2 bind common receptors, CD28 and CTLA-4, on T cells and have similar functional properties. We have found that the extracellular V (ariable)-like domains of B7-1 and B7-2 share significant sequence similarities with 3 major histocompatibility complex (MHC)-encoded members of the IgSF: butyrophilin, myelin/oligodendrocyte glycoprotein, and the chicken MHC molecule, B-G. This raises the question whether there is an evolutionary link between the MHC, which encodes molecules regulating the antigen specificity of T lymphocyte responses, and B7 molecules, which co-stimulate these responses in antigen-nonspecific fashion.

PMID:
7527261
PMCID:
PMC2142916
DOI:
10.1002/pro.5560030820
[Indexed for MEDLINE]
Free PMC Article

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