Abstract:
:Gene expression of DNA viruses requires nuclear import of the viral genome. Human Adenoviruses (Ads), like most DNA viruses, encode factors within early transcription units promoting their own gene expression and counteracting cellular antiviral defense mechanisms. The cellular transcriptional repressor Daxx prevents viral gene expression through the assembly of repressive chromatin remodeling complexes targeting incoming viral genomes. However, it has remained unclear how initial transcriptional activation of the adenoviral genome is achieved. Here we show that Daxx mediated repression of the immediate early Ad E1A promoter is efficiently counteracted by the capsid protein VI. This requires a conserved PPxY motif in protein VI. Capsid proteins from other DNA viruses were also shown to activate the Ad E1A promoter independent of Ad gene expression and support virus replication. Our results show how Ad entry is connected to transcriptional activation of their genome in the nucleus. Our data further suggest a common principle for genome activation of DNA viruses by counteracting Daxx related repressive mechanisms through virion proteins.
journal_name
PLoS Pathogjournal_title
PLoS pathogensauthors
Schreiner S,Martinez R,Groitl P,Rayne F,Vaillant R,Wimmer P,Bossis G,Sternsdorf T,Marcinowski L,Ruzsics Z,Dobner T,Wodrich Hdoi
10.1371/journal.ppat.1002549subject
Has Abstractpub_date
2012-02-01 00:00:00pages
e1002549issue
2eissn
1553-7366issn
1553-7374pii
PPATHOGENS-D-11-01833journal_volume
8pub_type
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