Baculovirus infection raises the level of TATA-binding protein that colocalizes with viral DNA replication sites.

Abstract

During the infection cycle of Autographa californica multicapsid nuclear polyhedrosis virus, the TATA-binding protein (TBP) of the insect host cell likely participates in early viral transcription, which is mediated by the host RNA polymerase II. However, the role of TBP in late and very late viral transcription, which is accomplished by an alpha-amanitin-resistant RNA polymerase, is unclear. We observed a dramatic increase of TBP protein during the late phases of infection. TBP mRNA levels, however, were not coordinately increased. Indirect-immunofluorescence studies revealed a nuclear redistribution of TBP during infection. After labeling of viral replication centers with bromodeoxyuridine (BrdU), costaining of TBP and BrdU showed that TBP localized to viral DNA replication centers. These results suggest a putative role of TBP during late viral transcription, which may occur in close proximity to viral DNA replication.

• Authors: Ilja Quadt, Daniela Mainz, Ruud Mans, Andreas Kremer, Dagmar Knebel-Mörsdorf
• Journal: Journal of virology (J Virol) Vol. 76 Issue 21 Pg. 11123-7 (Nov 2002) ISSN: 0022-538X [Print] United States
• PMID: 12368354 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• DNA, Viral
• TATA-Box Binding Protein

Topics

• Animals
• Cell Line
• Cell Nucleus (metabolism)
• DNA Replication
• DNA, Viral (biosynthesis)
• Moths (virology)
• Nucleopolyhedroviruses (metabolism, physiology)
• TATA-Box Binding Protein (genetics, metabolism)
• Transcription, Genetic