Tsurimoto, T., Stillman, B. (January 1991) Replication factors required for SV40 DNA replication in vitro. I. DNA structure-specific recognition of a primer-template junction by eukaryotic DNA polymerases and their accessory proteins. J Biol Chem, 266 (3). pp. 1950-60. ISSN 0021-9258
Abstract
Eukaryotic DNA polymerase delta and its accessory proteins are essential for SV40 DNA replication in vitro. A multi-subunit protein complex, replication factor C (RF-C), which is composed of subunits with apparent molecular weights of 140,000, 41,000, and 37,000, has primer/template binding and DNA-dependent ATPase activities. UV-cross-linking experiments demonstrated that the Mr = 140,000 subunit recognizes and binds to the primer-template DNA, whereas the Mr = 41,000 polypeptide binds ATP. Assembly of a replication complex at a primer-template junction has been studied in detail with synthetic, hairpin DNAs. Following glutaraldehyde fixation, a gel shift assay demonstrated that RF-C alone forms a weak binding complex with the hairpin DNA. Addition of ATP or its nonhydrolyzable analogue, ATP gamma S, increased specific binding to the DNA. Footprinting experiments revealed that RF-C recognizes the primer-template junction, covering 15 bases of the primer DNA from the 3'-end and 20 bases of the template DNA. Another replication factor, proliferating cell nuclear antigen (PCNA) binds to RF-C and the primer-template DNA forming a primer recognition complex and extends the protected region on the duplex DNA. This RF-C.PCNA complex has significant single-stranded DNA binding activity in addition to binding to a primer-template junction. However, addition of another replication factor, RF-A, completely blocked the nonspecific, single-stranded DNA binding by the RF-C.PCNA complex. RF-A therefore functions as a specificity factor for primer recognition. In the absence of RF-C, DNA polymerase delta (pol delta) and PCNA form a complex at the primer-template junction, protecting exactly the same site as the primer recognition complex. Addition of RF-C to this complex produced a higher order complex which is unstable unless its formation is coupled with translocation of pol delta. These results suggest that the sequential binding of RF-C, PCNA, and pol delta to a primer-template junction might directly account for the initiation of leading strand DNA synthesis at a replication origin. We demonstrate this directly in an accompanying paper (Tsurimoto, T., and Stillman, B. (1991) J. Biol. Chem. 266, 1961-1968).
| Item Type: | Paper |
|---|---|
| Uncontrolled Keywords: | Adenosine Triphosphate metabolism Base Sequence DNA Primase DNA Replication DNA Viral genetics DNA-Binding Proteins metabolism DNA-Directed DNA Polymerase metabolism In Vitro Macromolecular Substances Multienzyme Complexes Nuclear Proteins pharmacology Nucleic Acid Conformation Proliferating Cell Nuclear Antigen RNA Nucleotidyltransferases metabolism Simian virus 40 genetics Templates Genetic Virus Replication |
| Subjects: | bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > DNA replication organism description > virus |
| CSHL Authors: | |
| Communities: | CSHL labs > Stillman lab |
| Highlight: | Stillman, Bruce W. |
| Depositing User: | CSHL Librarian |
| Date: | 25 January 1991 |
| Date Deposited: | 28 Feb 2012 19:50 |
| Last Modified: | 20 Jun 2017 20:11 |
| Related URLs: | |
| URI: | https://repository.cshl.edu/id/eprint/25120 |
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