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• W1528689596 abstract "Hypoxia interrupts the initiation of simian virus 40 (SV40) replication in vivo at a stage situated before unwinding of the␣origin region. After re‐oxygenation, unwinding followed by a synchronous round of viral replication takes place. To␣further characterize the hypoxia‐induced inhibition of unwinding, we analysed the binding of several replication proteins to the viral minichromosome before and after re‐oxygenation. T antigen, the 34‐kDa subunit of replication protein A (RPA), topoisomerase I, the 48‐kDa subunit of primase, the 125‐kDa subunit of polymerase δ, and the 37‐kDa subunit of replication factor C (RFC) were present at the viral chromatin already under hypoxia. The 70‐kDa subunit of RPA, the 180‐kDa subunit of polymerase α, and proliferating cell nuclear antigen (PCNA) were barely detectable at the SV40 chromatin under hypoxia and significantly increased after re‐oxygenation. Immunoprecipitation of minichromosomes with T antigen‐specific antibody and subsequent digestion with micrococcus nuclease revealed that most of the minichromosome‐bound T antigen was associated with the viral origin in hypoxic and in re‐oxygenated cells. T antigen‐catalysed unwinding of the SV40 origin occurred, however, only after re‐oxygenation as indicated by (a) increased sensitivity of re‐oxygenated minichromosomes against digestion with single‐stranded DNA‐specific nuclease P1; (b) stabilization of RPA‐34 binding at the SV40 minichromosome; and (c) additional phosphorylations of RPA‐34 after re‐oxygenation, probably catalysed by DNA‐dependent protein kinase. The results presented suggest that the subunits of the proteins necessary for unwinding, primer synthesis and primer elongation first assemble at the SV40 origin in form of stable, active complexes directly before they start to work." @default.
• W1528689596 created "2016-06-24" @default.
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• W1528689596 date "2002-04-24" @default.
• W1528689596 modified "2023-10-17" @default.
• W1528689596 title "Re-oxygenation of hypoxic simian virus 40 (SV40)-infected CV1 cells causes distinct changes of SV40 minichromosome-associated replication proteins" @default.
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• W1528689596 doi "https://doi.org/10.1046/j.1432-1033.2002.02902.x" @default.
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