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Replication of SV40 in vitro using proteins derived from a human cell extract
M P Fairman1, G Prelich, T Tsurimoto
1Cold Spring Harbor Laboratories, New York 11724.
Journal of Cell Science. Supplement
|January 1, 1989
Summary
Researchers identified key proteins essential for simian virus 40 (SV40) DNA replication in vitro. These factors coordinate DNA synthesis and may apply to higher eukaryotes, advancing our understanding of replication mechanisms.
Area of Science:
- Molecular Biology
- Virology
- Biochemistry
Background:
- Simian virus 40 (SV40) replication in vitro requires specific cellular factors.
- Human cell extracts support multiple rounds of SV40 replication in the presence of large T antigen.
Purpose of the Study:
- To identify and characterize cellular proteins involved in SV40 DNA replication.
- To elucidate the stages and mechanisms of SV40 replication in vitro.
Main Methods:
- Fractionation of human cell extracts to isolate replication factors.
- Purification of essential proteins, including proliferating cell nuclear antigen and replication factors A and C.
- Biochemical characterization of protein functions in SV40 replication.
Main Results:
- Identified essential proteins: proliferating cell nuclear antigen and replication factor-C, crucial for coordinating leading and lagging strand synthesis.
- Characterized replication factor-A as a eukaryotic single-stranded DNA binding protein.
- Described interactions of cellular factors affecting DNA replication initiation.
Conclusions:
- SV40 replication in vitro can be dissected into multiple stages involving specific protein factors.
- A model for the replication fork suggests roles for alpha- and delta-polymerases, potentially applicable to higher eukaryotes.