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J. Virol., Oct 1995, 6098-6105, Vol 69, No. 10
R Thale, U Szepan, H Hengel, G Geginat, P Lucin and UH Koszinowski
Mouse cytomegalovirus (MCMV) functions expressed at the beginning of the
early phase of the viral replication cycle interfere with the major
histocompatibility complex (MHC) class I-restricted pathway of antigen
presentation (M. J. Reddehase, M. R. Fibi, G. M. Keil, and U. H.
Koszinowski, J. Virol. 60:1125-1129, 1986; M. Del Val, K. Munch, M. J.
Reddehase, and U. H. Koszinowski, Cell 58:305-315, 1989). Nascent MHC class
I heavy chains associate with beta 2-microglobulin and peptide, but the
assembled trimolecular complex is retained in the endoplasmatic
reticulum/cis-Golgi compartment (M. Del Val, H. Hengel, H. Hacker, U.
Hartlaub, T. Ruppert, P. Lucin, and U. H. Koszinowski, J. Exp. Med.
176:729-738, 1992). To locate the responsible genomic region, the
cytoplasmic retention of MHC class I molecules after injection of MCMV DNA
was tested. The function was mapped to the HindIII E fragment. A
recombinant MCMV deletion mutant delta MS94.5 lacking 15.8 kb in HindIII-E
was constructed. Restoration of MHC class I molecule maturation and
recognition of antigenic peptides by cytolytic T lymphocytes during the
first hours of the early phase in mutant virus- infected cells proved the
correct location to a 6.8-kb region in the HindIII E fragment. At later
stages of the early phase, membrane- resident MHC class I molecules and
cytolytic T lymphocyte recognition disappeared in delta MS94.5 mutant
virus-infected cells. These results demonstrate that more than one
early-gene function of MCMV affects the MHC class I pathway of antigen
presentation. The redundant MHC class I- reactive functions target the
transport of MHC class I molecules at different steps.
Copyright © 1995, American Society for Microbiology
Identification of the mouse cytomegalovirus genomic region affecting major histocompatibility complex class I molecule transport
Department of Virology, University of Heidelberg, Germany.
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