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. 1994 May;68(5):3051–3064. doi: 10.1128/jvi.68.5.3051-3064.1994

Papillomavirus contains cis-acting sequences that can suppress but not regulate origins of DNA replication.

F S Nallaseth 1, M L DePamphilis 1
PMCID: PMC236795  PMID: 8151772

Abstract

Bovine papillomavirus (BPV) DNA has been reported to restrict its own replication and that of the lytic simian virus 40 (SV40) origin to one initiation event per molecule per S phase, which suggests BPV DNA replication as a model for cellular chromosome replication. Suppression of the SV40 origin required two cis-acting BPV sequences (NCOR-1 and -2) and one trans-acting BPV protein. The results presented in this paper confirm the presence of two NCOR sequences in the BPV genome that can suppress polyomavirus (PyV) as well as SV40 origin-dependent DNA replication as much as 40-fold. However, in contrast to results of previous studies on SV40, most of the suppression of the PyV origin was due to NCOR-1, a 512-bp sequence that functioned independently of distance or orientation with respect to the PyV origin and that was not required for BPV DNA replication. Moreover, NCOR-1 alone or together with NCOR-2 did not restrict the ability of the PyV ori to reinitiate replication within a single S phase and did not require any BPV protein to exert suppression. Furthermore, NCOR-1 did not suppress BPV origin-dependent DNA replication except in the presence of PyV large tumor antigen (T-ag). Since NCOR-1 suppression of PyV origin activity also varied with T-ag concentration, suppression of origins by NCOR sequences appeared to require papovavirus T-ag. Therefore, it is unlikely that NCOR sequences are involved in regulating BPV DNA replication. When these results are taken together with those from other laboratories, BPV appears to be a slowly replicating version of papovaviruses rather than a model for origins of DNA replication in eukaryotic cell chromosomes.

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