PMID- 8091661 OWN - NLM STAT- MEDLINE DCOM- 19941020 LR - 20220330 IS - 0042-6822 (Print) IS - 0042-6822 (Linking) VI - 204 IP - 1 DP - 1994 Oct TI - Human herpesvirus 6 (HHV-6) is a helper virus for adeno-associated virus type 2 (AAV-2) and the AAV-2 rep gene homologue in HHV-6 can mediate AAV-2 DNA replication and regulate gene expression. PG - 304-11 AB - We have previously described the apparent acquisition by human herpesvirus 6 (HHV-6) of the multifunctional rep gene of the helper-dependent human parvovirus adeno-associated virus type 2 (AAV-2). We report here that HHV-6 is a full helper virus for AAV-2 replication, suggesting a mechanism for transfer of the rep gene between the two viruses by recombination of replicative intermediates. The HHV-6 rep gene cloned under control of the human cytomegalovirus immediate early promoter complemented replication of a rep-deficient AAV-2 genome. In cotransfection experiments with heterologous promoters linked to the CAT reporter gene, HHV-6 rep activated the human immunodeficiency virus (HIV) long terminal repeat (LTR) in fibroblast cell lines but not in T-cells. In contrast, AAV-2 rep inhibited HIV LTR activity in both fibroblast and T-cell lines. The effect of HHV-6 and AAV-2 rep genes on the HIV LTR was independent of the NF-kappa B, Sp1, and TATA box elements. These results suggest that HHV-6 Rep is a multifunctional regulatory protein with properties related to, but distinct from, those of AAV-2 Rep. FAU - Thomson, B J AU - Thomson BJ AD - Department of Medicine, University of Cambridge, Addenbrooke's Hospital, UK. FAU - Weindler, F W AU - Weindler FW FAU - Gray, D AU - Gray D FAU - Schwaab, V AU - Schwaab V FAU - Heilbronn, R AU - Heilbronn R LA - eng SI - GENBANK/X83413 PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - United States TA - Virology JT - Virology JID - 0110674 RN - 0 (DNA, Viral) RN - 0 (DNA-Binding Proteins) RN - 0 (Recombinant Fusion Proteins) RN - 0 (Viral Proteins) RN - 137750-19-7 (rep proteins, Adeno-associated virus 2) SB - IM MH - Cell Line MH - *DNA Replication MH - DNA, Viral/biosynthesis MH - DNA-Binding Proteins/*genetics/physiology MH - Dependovirus/*growth & development MH - Gene Expression Regulation, Viral/*genetics MH - Genes, Regulator/physiology MH - Genes, Viral/physiology MH - Genetic Complementation Test MH - HIV Long Terminal Repeat/genetics MH - Helper Viruses/*physiology MH - Herpesvirus 6, Human/*physiology MH - Humans MH - Recombinant Fusion Proteins/biosynthesis MH - Sequence Deletion/physiology MH - Sequence Homology, Nucleic Acid MH - Transcriptional Activation MH - Transfection MH - Viral Proteins/*genetics/physiology MH - Virus Replication/*genetics EDAT- 1994/10/01 00:00 MHDA- 1994/10/01 00:01 CRDT- 1994/10/01 00:00 PHST- 1994/10/01 00:00 [pubmed] PHST- 1994/10/01 00:01 [medline] PHST- 1994/10/01 00:00 [entrez] AID - S0042-6822(84)71535-2 [pii] AID - 10.1006/viro.1994.1535 [doi] PST - ppublish SO - Virology. 1994 Oct;204(1):304-11. doi: 10.1006/viro.1994.1535.