A complex between the MHC class I homologue encoded by human cytomegalovirus and β2 microglobulin (original) (raw)

Nature volume 347, pages 770–772 (1990)Cite this article

Abstract

HUMAN cytomegalovirus (HCMV) is a ubiquitous pathogen that persists in the host and can cause severe disease in the immuno-compromised individual or in the fetus. Analysis of the nucleotide sequence of the virus genome has revealed the presence of an open reading frame whose predicted translation product has homology with the heavy chain of the major histocompatibility complex (MHC) class I molecule of higher eukaryotes1, and the observed sequence homology was given additional significance by the independent observation2 that HCMV virions can bind β2 microglobulin (β2m), the light chain of the MHC class I molecule. We expressed both the HCMV class I homologue and the human β2m gene in recombinant vaccinia viruses. We show that the coexpressed gene products associate, that the transport of β2m to the cell surface is dependent on coexpression of the class I homologue and that the viral gene product is therefore functionally related to its cellular counterpart. We observe also that, in HCMV-infected cells, no synthesis of mature cellular class I molecules occurs, while messenger RNA levels remain unaltered, and we speculate that one function of the viral homologue may be to sequester β2m, thus preventing the maturation of cellular class I molecules and rendering the infected cell unrecognizable by cytotoxic T cells.

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Author notes

  1. Geoffrey Smith
    Present address: Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford, 0X13RE, UK
  2. Stephan Beck
    Present address: ICRF, Lincolns Inn Fields, London, WC2N 3PX, UK

Authors and Affiliations

  1. Division of Virology, Department of Pathology, University of Cambridge, Tennis Court Road, Cambridge, CB21QP, UK
    Helena Browne, Geoffrey Smith & Tony Minson
  2. MRC Laboratory of Molecular Biology, Hills Road, Cambridge, CB2 2QH, UK
    Stephan Beck

Authors

  1. Helena Browne
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  2. Geoffrey Smith
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  3. Stephan Beck
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  4. Tony Minson
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Browne, H., Smith, G., Beck, S. et al. A complex between the MHC class I homologue encoded by human cytomegalovirus and β2 microglobulin.Nature 347, 770–772 (1990). https://doi.org/10.1038/347770a0

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