Open AccessTimed interactions between viral and cellular replication factors during the initiation of SV40 in vitro DNA replication
Author(s) -
Poonam Taneja,
Heinz-Peter Nasheuer,
Hella Hartmann,
Frank Grosse,
Ellen Fanning,
Klaus Weißhart
Publication year - 2007
Publication title -
biochemical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.706
H-Index - 265
eISSN - 1470-8728
pISSN - 0264-6021
DOI - 10.1042/bj20070794
Subject(s) - primase , biology , dna replication , dna polymerase , replication factor c , eukaryotic dna replication , origin recognition complex , primer (cosmetics) , microbiology and biotechnology , control of chromosome duplication , polymerase , dna , genetics , rna , reverse transcriptase , chemistry , gene , organic chemistry
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.