Timed interactions between viral and cellular replication factors during the initiation of SV40 in vitro DNA replication.
The initiation of SV40 (simian virus 40) DNA replication requires the co-operative interactions between the viral Tag (large T-antigen), RPA (replication protein A) and Pol (DNA polymerase alpha-primase) on the template DNA. Binding interfaces mapped on these enzymes and expressed as peptides competed with the mutual interactions of the native proteins. Prevention of the genuine interactions was accomplished only prior to the primer synthesis step and blocked the assembly of a productive initiation complex. Once the complex was engaged in the synthesis of an RNA primer and its extension, the interfering effects of the peptides ceased, suggesting a stable association of the replication factors during the initiation phase. Specific antibodies were still able to disrupt preformed interactions and inhibited primer synthesis and extension activities, underlining the crucial role of specific protein-protein contacts during the entire initiation process.
Department of Biological Sciences, Vanderbilt University, 465 21st Avenue South, Nashville, TN 37235, USA.
Poonam
P
Taneja
Heinz-Peter
HP
Nasheuer
Hella
H
Hartmann
Frank
F
Grosse
Ellen
E
Fanning
Klaus
K
Weisshart
D000957:Antigens, Viral, Tumor / Q000235:genetics / Q000378:metabolism; D004261:DNA Replication; D015684:Gene Products, pol / Q000235:genetics / Q000378:metabolism; D046912:Multiprotein Complexes / Q000378:metabolism; D011485:Protein Binding; D051716:Replication Protein A / Q000235:genetics / Q000378:metabolism; D013539:Simian virus 40 / Q000502:physiology*; D013997:Time Factors; D014764:Viral Proteins / Q000235:genetics / Q000378:metabolism
D000957:Antigens, Viral, Tumor; D015684:Gene Products, pol; D046912:Multiprotein Complexes; D051716:Replication Protein A; D014764:Viral Proteins