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Identification of the glycoprotein H gene of murine cytomegalovirus

Department of Microbiology, University of Western Australia, Queen Elizabeth II Medical Centre, Nedlands 6009, Western Australia, Australia

Partial sequencing of the HindIII C fragment of murine cytomegalovirus (MCMV) revealed an open reading frame of 2172 nucleotides in length encoding a 724 amino acid protein with a predicted M_r of 80.4K. Analysis of the predicted amino acid sequence revealed homology with glycoprotein H (gH) from a number of other herpesviruses. MCMV gH showed strongest amino acid identity with human (H) CMV and human herpesvirus 6 gH, and less identity with the gH protein sequences of Epstein-Barr virus, varicella-zoster virus and herpes simplex virus type 1. The greatest identity between MCMV and HCMV gH occurs in the C-terminal region. The MCMV gH is characterized by having a 14 amino acid signal sequence, a 23 amino acid transmembrane region, a seven amino acid positively charged cytoplasmic anchor sequence and eight putative N-linked glycosylation sites. Comparison of MCMV gH with that of HCMV indicates that there are 12 conserved cysteine residues and three conserved potential N-linked glycosylation sites.

Received 31 December 1991; accepted 18 March 1992.

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