Abstract:
:During the S phase of the eukaryotic cell cycle and in virus-infected cells, DNA replication takes place at discrete sites in the nucleus, although it is not clear how the proteins involved in the replicative process are directed to these sites. Nuclear factor I is a cellular, sequence-specific DNA-binding protein utilized by adenovirus type 2 to facilitate the assembly of a nucleoprotein complex at the viral origin of DNA replication. Immunofluorescence experiments reveal that in uninfected cells, nuclear factor I is distributed evenly throughout the nucleus. However, after a cell is infected with adenovirus type 2, the distribution of nuclear factor I is dramatically altered, being colocalized with the viral DNA-binding protein in a limited number of subnuclear sites which bromodeoxyuridine pulse-labeling experiments have identified as sites of viral DNA replication. Experiments with adenovirus type 4, which does not require nuclear factor I for viral DNA replication, indicate that although the adenovirus type 4 DNA-binding protein is localized to discrete nuclear sites, this does not result in the redistribution of nuclear factor I. Localization of nuclear factor I to discrete subnuclear sites is therefore likely to represent a specific targeting event that reflects the requirement for nuclear factor I in adenovirus type 2 DNA replication.
journal_name
J Viroljournal_title
Journal of virologyauthors
Bosher J,Dawson A,Hay RTdoi
10.1128/JVI.66.5.3140-3150.1992subject
Has Abstractpub_date
1992-05-01 00:00:00pages
3140-50issue
5eissn
0022-538Xissn
1098-5514journal_volume
66pub_type
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