The human herpesvirus-8 ORF 57 gene and its properties

Bello, L.J., Davison, A.J. , Glenn, M.A., Whitehouse, A., Rethmeier, N., Schulz, T.F. and Barklie Clements, J. (1999) The human herpesvirus-8 ORF 57 gene and its properties. Journal of General Virology, 80(12), pp. 3207-15.

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Human herpesvirus-8 (HHV-8) is a gamma(2) lymphotropic herpesvirus associated with Kaposi's sarcoma, a major neoplasm of AIDS patients, and with other AIDS-related neoplasms. The HHV-8 ORF 57 gene is conserved throughout the herpesvirus family and has a herpes simplex virus type 1 homologue, IE63 (also termed ICP27), which is an essential regulatory protein and acts at both transcriptional and post-transcriptional levels. We show that, contrary to the published HHV-8 sequence, which predicts a protein of 275 amino acids, the ORF 57 gene is spliced, contains a single intron and encodes a protein of 455 amino acids. For several gammaherpesviruses examined, the upstream coding exon is 16-17 amino acids in length and is rich in methionine residues. When ORF 57 was fused to the gene for enhanced green fluorescent protein (EGFP), the fusion protein exhibited a punctate nuclear distribution that co-localized with the cellular splicing factor SC-35. Unlike the IE63-EGFP fusion protein, ORF 57-EGFP did not shuttle from the nucleus to the cytoplasm in the presence of actinomycin D. However, ORF 57-EGFP was capable of shuttling from a transfected monkey nucleus to a recipient mouse nucleus in an interspecies heterokaryon assay. These data indicate that HHV-8 ORF 57 and IE63 possess certain common properties.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Davison, Professor Andrew
Authors: Bello, L.J., Davison, A.J., Glenn, M.A., Whitehouse, A., Rethmeier, N., Schulz, T.F., and Barklie Clements, J.
College/School:College of Medical Veterinary and Life Sciences > Institute of Infection Immunity and Inflammation
Journal Name:Journal of General Virology
Journal Abbr.:J. Gen. Virol.
Publisher:Society for General Microbiology
ISSN (Online):1465-2099

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