Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/70560
標題: The Early Gene hhi1 Reactivates Heliothis zea Nudivirus 1 in Latently Infected Cells
作者: Wu, Y.L.
Wu, C.P.
Lee, S.T.
Tang, H.
Chang, C.H.
Chen, H.H.
Chao, Y.C.
關鍵字: non-occluded baculovirus;herpes-simplex-virus;mamestra-brassicae;nonoccluded virus;hz-1 baculovirus;viral-infection;sequence;insects;establishment;activation
Project: Journal of Virology
期刊/報告no:: Journal of Virology, Volume 84, Issue 2, Page(s) 1057-1065.
摘要: 
Heliothis zea nudivirus 1 (HzNV-1), previously known as Hz-1 virus, is an insect virus able to establish both productive and latent infections in several lepidopteran insect cells. Here, we have cloned and characterized one of the HzNV-1 early genes, hhi1, which maps to the HindIII-I fragment of the viral genome. During the productive viral infection, a 6.2-kb hhi1 transcript was detectable as early as 0.5 h postinfection (hpi). The level of transcript reached a maximum at 2 hpi and gradually decreased after 4 hpi. The transcript was not detectable during the latent phase of viral infection. Upon cycloheximide treatment, much higher levels of hhi1 transcript were detected throughout the productive viral infection cycle, suggesting that newly synthesized proteins are not needed for the expression of hhi1. Nevertheless, viral coinfection can further stimulate the expression of transfected hhi1 promoter in a plasmid. Transient hhi1 expression in latently infected cells resulted in a significant increase in virus titer and viral DNA propagation, suggesting that hhi1 plays a critical role in viral reactivation. Additional experiments showed that six early genes, which possibly function in transcription or DNA replication, were activated in the latent cells upon hhi1 transfection. Among these six genes, orf90 and orf121 expression could be induced by hhi1 alone without the need for other viral genes. Our discovery should be useful for future mechanistic study of the switches of latent/productive HzNV-1 viral infections.
URI: http://hdl.handle.net/11455/70560
ISSN: 0022-538X
DOI: 10.1128/jvi.01548-09
Appears in Collections:期刊論文

Show full item record
 

Google ScholarTM

Check

Altmetric

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.