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J Virol, August 1998, p. 6725-6731, Vol. 72, No. 8
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

The Immunogenic Glycoprotein gp35-37 of Human Herpesvirus 8 Is Encoded by Open Reading Frame K8.1

Marc-Steffen Raab,1 Jens-Christian Albrecht,1 Alexander Birkmann,1 Svenja Yaguboglu,1 Dieter Lang,2 Bernhard Fleckenstein,1 and Frank Neipel1,*

Institut für Klinische und Molekulare Virologie, Universität Erlangen-Nürnberg, D-91054 Erlangen,1 and Biotest GmbH, D-63303 Dreieich,2 Germany

Received 10 February 1998/Accepted 13 May 1998

Human herpesvirus 8 (HHV-8) is likely to be involved in the pathogenesis of Kaposi's sarcoma (KS) and body cavity-based lymphomas (BCBLs). The HHV-8 genome is primarily in a latent state in BCBL-derived cell lines like BCBL-1, but lytic replication can be induced by phorbol esters (R. Renne, W. Zhang, B. Herndier, M. McGrath, N. Abbey, D. Kedes, and D. E. Ganem, Nat. Med. 2:342-346, 1996). A 35- to 37-kDa glycoprotein (gp35-37) is the polypeptide most frequently and intensively recognized by KS patient sera on Western blots with induced BCBL-1 cells. Its apparent molecular mass is reduced to 30 kDa by digestion with peptide-N-glycosidase F. By searching the known HHV-8 genomic sequence for open reading frames (ORF) with the potential to encode such a glycoprotein, an additional, HHV-8-specific reading frame was identified adjacently to ORF K8. This ORF, termed K8.1, was found to be transcribed primarily into a spliced mRNA encoding a glycoprotein of 228 amino acids. Recombinant K8.1 was regularly recognized by KS patient sera in Western blots, and immunoaffinity-purified antibodies to recombinant K8.1 reacted with gp35-37. This shows that the immunogenic gp35-37 is encoded by HHV-8 reading frame K8.1, which will be a useful tool for studies of HHV-8 epidemiology and pathogenesis.

* Corresponding author. Mailing address: Institut für Klinische und Molekulare Virologie, Universität Erlangen-Nürnberg, Schlossgarten 4, D-91054 Erlangen, Germany. Phone: (49)-9131-856483. Fax: (49)-9131-856599. E-mail: neipel{at}viro.med.uni-erlangen.de.

J Virol, August 1998, p. 6725-6731, Vol. 72, No. 8
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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