Little is known about initiation of DNA replication in eukaryotic organisms or how these events are regulated. Studies of initiation of DNA replication and its regulation are important because these processes are believed to play central roles in diverse biological events, such as control of development and cancer. The Simian Virus 40 (SV40) in vitro replication system is an excellent model for studies of initiation of eukaryotic replication. Sensitive assays have been developed that can be used to study SV40 initiation events prior to DNA synthesis and to follow replication events seconds after DNA synthesis initiates. Equally important, it is now possible to examine the regulation of these events; a process that can theoretically occur at any stage of initiation. The experiments in this proposal are designed to establish the mechanism of initiation of SV40 DNA synthesis in vitro. They are also designed to further characterize the enzymatic requirements for initiation of SV40 DNA replication. Finally, the experiments in this proposal are intended to more fully describe aspects of the regulation of initiation of SV40 DNA synthesis in vitro. Initiation events prior to DNA synthesis will be followed using previously described unwinding assays. Pulse and pulse-chase reactions will be used to generate nascent DNA, including primer-DNA, formed seconds after the start of DNA synthesis. These DNAs will be used to establish the mechanism of initiation of DNA synthesis. Similar studies will define the enzymatic requirements for initiation of DNA synthesis. Insights into the dNTP dependent of the preinitiation complex in the vicinity of the SV40 origin will be obtained by determining the size and position of the unwound region in the form UR. The knowledge derived from studies of initiation of SV40 DNA replication in permissive and nonpermissive extracts should provide insights into initiation of chromosomal DNA replication.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
9R01GM055397-06A1
Application #
2023964
Study Section
Virology Study Section (VR)
Project Start
1992-01-01
Project End
2001-03-31
Budget Start
1997-04-01
Budget End
1998-03-31
Support Year
6
Fiscal Year
1997
Total Cost
Indirect Cost
Name
Tufts University
Department
Biochemistry
Type
Schools of Medicine
DUNS #
604483045
City
Boston
State
MA
Country
United States
Zip Code
02111
Meinke, Gretchen; Phelan, Paul J; Harrison, Celia J et al. (2013) Analysis of the costructure of the simian virus 40 T-antigen origin binding domain with site I reveals a correlation between GAGGC spacing and spiral assembly. J Virol 87:2923-34
Harrison, Celia J; Meinke, Gretchen; Kwun, Hyun Jin et al. (2011) Asymmetric assembly of Merkel cell polyomavirus large T-antigen origin binding domains at the viral origin. J Mol Biol 409:529-42
Meinke, Gretchen; Phelan, Paul J; Fradet-Turcotte, Amélie et al. (2011) Structure-based analysis of the interaction between the simian virus 40 T-antigen origin binding domain and single-stranded DNA. J Virol 85:818-27
Meinke, Gretchen; Phelan, Paul; Fradet-Turcotte, Amélie et al. (2011) Structure-based design of a disulfide-linked oligomeric form of the simian virus 40 (SV40) large T antigen DNA-binding domain. Acta Crystallogr D Biol Crystallogr 67:560-7
Fradet-Turcotte, Amelie; Morin, Genevieve; Lehoux, Michael et al. (2010) Development of quantitative and high-throughput assays of polyomavirus and papillomavirus DNA replication. Virology 399:65-76
Kumar, Anuradha; Joo, Woo S; Meinke, Gretchen et al. (2008) Evidence for a structural relationship between BRCT domains and the helicase domains of the replication initiators encoded by the Polyomaviridae and Papillomaviridae families of DNA tumor viruses. J Virol 82:8849-62
Meinke, Gretchen; Phelan, Paul; Moine, Stephanie et al. (2007) The crystal structure of the SV40 T-antigen origin binding domain in complex with DNA. PLoS Biol 5:e23
Kumar, Anuradha; Meinke, Gretchen; Reese, Danielle K et al. (2007) Model for T-antigen-dependent melting of the simian virus 40 core origin based on studies of the interaction of the beta-hairpin with DNA. J Virol 81:4808-18
Fradet-Turcotte, Amelie; Vincent, Caroline; Joubert, Simon et al. (2007) Quantitative analysis of the binding of simian virus 40 large T antigen to DNA. J Virol 81:9162-74
Reese, Danielle K; Meinke, Gretchen; Kumar, Anuradha et al. (2006) Analyses of the interaction between the origin binding domain from simian virus 40 T antigen and single-stranded DNA provide insights into DNA unwinding and initiation of DNA replication. J Virol 80:12248-59

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