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Rep-dependent initiation of adeno-associated virus type 2 DNA replication by a herpes simplex virus type 1 replication complex in a reconstituted system.

Artikel i vetenskaplig tidskrift
Författare P Ward
Maria Falkenberg
Per Elias
M Weitzman
R M Linden
Publicerad i Journal of virology
Volym 75
Nummer/häfte 21
Sidor 10250-8
ISSN 0022-538X
Publiceringsår 2001
Publicerad vid Institutionen för medicinsk och fysiologisk kemi
Sidor 10250-8
Språk en
Länkar dx.doi.org/10.1128/JVI.75.21.10250-...
Ämnesord DNA Helicases, physiology, DNA Replication, DNA-Binding Proteins, Dependovirus, genetics, Hela Cells, Herpesvirus 1, Human, physiology, Humans, Trans-Activators, physiology, Virus Replication
Ämneskategorier Virologi, Medicinsk bioteknologi (med inriktning mot cellbiologi (inklusive stamcellsbiologi), molekylärbiologi, mikrobiologi, biokemi eller biofarmaci)

Sammanfattning

Productive infection by adeno-associated virus type 2 (AAV) requires coinfection with a helper virus, e.g., adenovirus or herpesviruses. In the case of adenovirus coinfection, the replication machinery of the host cell performs AAV DNA replication. In contrast, it has been proposed that the herpesvirus replication machinery might replicate AAV DNA. To investigate this question, we have attempted to reconstitute AAV DNA replication in vitro using purified herpes simplex virus type 1 (HSV-1) replication proteins. We show that the HSV-1 UL5, UL8, UL29, UL30, UL42, and UL52 gene products along with the AAV Rep68 protein are sufficient to initiate replication on duplex DNA containing the AAV origins of replication, resulting in products several hundred nucleotides in length. Initiation can occur also on templates containing only a Rep binding site and a terminal resolution site. We further demonstrate that initiation of DNA synthesis can take place with a subset of these factors: Rep68 and the UL29, UL30, and UL42 gene products. Since the HSV polymerase and its accessory factor (the products of the UL30 and UL42 genes) are unable to efficiently perform synthesis by strand displacement, it is likely that in addition to creating a hairpin primer, the AAV Rep protein also acts as a helicase for DNA synthesis. The single-strand DNA binding protein (the UL29 gene product) presumably prevents reannealing of complementary strands. These results suggest that AAV can use the HSV replication apparatus to replicate its DNA. In addition, they may provide a first step for the development of a fully reconstituted AAV replication assay.

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