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J. Virol., Dec 1996, 8833-8849, Vol 70, No. 12
WD Rawlinson, HE Farrell and BG Barrell
The complete DNA sequence of the Smith strain of murine cytomegalovirus
(MCMV) was determined from virion DNA by using a whole-genome shotgun
approach. The genome has an overall G+C content of 58.7%, consists of
230,278 bp, and is arranged as a single unique sequence with short (31- bp)
terminal direct repeats and several short internal repeats. Significant
similarity to the genome of the sequenced human cytomegalovirus (HCMV)
strain AD169 is evident, particularly for 78 open reading frames encoded by
the central part of the genome. There is a very similar distribution of G+C
content across the two genomes. Sequences toward the ends of the MCMV
genome encode tandem arrays of homologous glycoproteins (gps) arranged as
two gene families. The left end encodes 15 gps that represent one family,
and the right end encodes a different family of 11 gps. A homolog (m144) of
cellular major histocompatibility complex (MHC) class I genes is located at
the end of the genome opposite the HCMV MHC class I homolog (UL18). G
protein- coupled receptor (GCR) homologs (M33 and M78) occur in positions
congruent with two (UL33 and UL78) of the four putative HCMV GCR homologs.
Counterparts of all of the known enzyme homologs in HCMV are present in the
MCMV genome, including the phosphotransferase gene (M97), whose product
phosphorylates ganciclovir in HCMV-infected cells, and the assembly protein
(M80).
Copyright © 1996, American Society for Microbiology
Analysis of the complete DNA sequence of murine cytomegalovirus
Laboratory of Molecular Biology, Cambridge, United Kingdom. WDR@westmed.wh.su.edu.au
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