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J. Biol. Chem., Vol. 277, Issue 12, 10427-10434, March 22, 2002
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§¶,
**,
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From the The adenovirus early proteins E1A and
E1B-55kDa are key regulators of viral DNA replication, and it
was thought that targeting of p53 by E1B-55kDa is essential for this
process. Here we have identified a previously unrecognized function of
E1B for adenovirus replication. We found that E1B-55kDa is involved in
targeting the transcription factor YB-1 to the nuclei of adenovirus
type 5-infected cells where it is associated with viral inclusion
bodies believed to be sites of viral transcription and replication. We show that YB-1 facilitates E2 gene expression through the E2 late promoter thus controlling E2 gene activity at later stages of infection. The role of YB-1 for adenovirus replication was demonstrated with an E1-minus adenovirus vector containing a YB-1 transgene. In
infected cells, AdYB-1 efficiently replicated and produced infectious
progeny particles. Thus, adenovirus E1B-55kDa protein and the host cell
factor YB-1 act jointly to facilitate adenovirus replication in the
late phase of infection.
Institut für Experimentelle Onkologie
und Therapieforschung, Technische Universität München,
Klinikum Rechts der Isar, München 81675, Germany, the
§ Institut für Pathologie, Universitätsklinikum
Charité, Humboldt-Universität zu Berlin, Berlin 10117, Germany, the
Max-Delbrück Zentrum für Molekulare
Medizin, Berlin 13125, Germany, the §§ Institut
für Virologie, Philipps-Universität Marburg, Marburg 35037, Germany, the ¶¶ Institut für
Transplantationsdiagnostik und Zelltherapeutika and the
** Institut für Humangenetik und Anthropologie,
Heinrich-Heine Universität Düsseldorf, Düsseldorf
40225, Germany, and the 
Gene Therapy
Program, University of Alabama at Birmingham, Wallace Tumor Institute,
Birmingham, Alabama 352948
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