Abstract
Staphylococcus aureus plasmid pT181 is thought to replicate via an asymmetric rolling-circle mechanism. By studying pulse labeled replicative intermediates, here we report that pT181 replication involves: (1) a post-replicative hypersupercoiled monomer and (2) a partially replicated intermediate which lacks superhelicity but is unlike a typical rolling-circle intermediate in that only nascent strands of less than unit length are released by alkali denaturation. A model for pT181 replication is proposed to accommodate this apparent discrepancy.
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- Arai N., Polder L., Akai K., Kornberg A. Replication of phi X174 DNA with purified enzymes. II. Multiplication of the duplex form by coupling of continuous and discontinuous synthetic pathways. J Biol Chem. 1981 May 25;256(10):5239–5246. [PubMed] [Google Scholar]
- Baker T. A., Sekimizu K., Funnell B. E., Kornberg A. Extensive unwinding of the plasmid template during staged enzymatic initiation of DNA replication from the origin of the Escherichia coli chromosome. Cell. 1986 Apr 11;45(1):53–64. doi: 10.1016/0092-8674(86)90537-4. [DOI] [PubMed] [Google Scholar]
- Clewell D. B., Helinski D. R. Properties of a supercoiled deoxyribonucleic acid-protein relaxation complex and strand specificity of the relaxation event. Biochemistry. 1970 Oct 27;9(22):4428–4440. doi: 10.1021/bi00824a026. [DOI] [PubMed] [Google Scholar]
- Clewell D. B., Helinski D. R. Supercoiled circular DNA-protein complex in Escherichia coli: purification and induced conversion to an opern circular DNA form. Proc Natl Acad Sci U S A. 1969 Apr;62(4):1159–1166. doi: 10.1073/pnas.62.4.1159. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Cozzarelli N. R. The mechanism of action of inhibitors of DNA synthesis. Annu Rev Biochem. 1977;46:641–668. doi: 10.1146/annurev.bi.46.070177.003233. [DOI] [PubMed] [Google Scholar]
- Eisenberg S., Griffith J., Kornberg A. phiX174 cistron A protein is a multifunctional enzyme in DNA replication. Proc Natl Acad Sci U S A. 1977 Aug;74(8):3198–3202. doi: 10.1073/pnas.74.8.3198. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Gilbert W., Dressler D. DNA replication: the rolling circle model. Cold Spring Harb Symp Quant Biol. 1968;33:473–484. doi: 10.1101/sqb.1968.033.01.055. [DOI] [PubMed] [Google Scholar]
- Gruss A. D., Ross H. F., Novick R. P. Functional analysis of a palindromic sequence required for normal replication of several staphylococcal plasmids. Proc Natl Acad Sci U S A. 1987 Apr;84(8):2165–2169. doi: 10.1073/pnas.84.8.2165. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Ikeda J. E., Yudelevich A., Hurwitz J. Isolation and characterization of the protein coded by gene A of bacteriophage phiX174 DNA. Proc Natl Acad Sci U S A. 1976 Aug;73(8):2669–2673. doi: 10.1073/pnas.73.8.2669. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Inselburg J., Fuke M. Isolation of catenated and replicating DNA molecules of colicin factor E1 from minicells. Proc Natl Acad Sci U S A. 1971 Nov;68(11):2839–2842. doi: 10.1073/pnas.68.11.2839. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Itoh T., Tomizawa J. Formation of an RNA primer for initiation of replication of ColE1 DNA by ribonuclease H. Proc Natl Acad Sci U S A. 1980 May;77(5):2450–2454. doi: 10.1073/pnas.77.5.2450. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Katz L., Williams P. H., Sato S., Leavitt R. W., Helinski D. R. Purification and characterization of covalently closed replicative intermediates of ColEl DNA from Escherichia coli. Biochemistry. 1977 Apr 19;16(8):1677–1683. doi: 10.1021/bi00627a024. [DOI] [PubMed] [Google Scholar]
- Khan S. A., Carleton S. M., Novick R. P. Replication of plasmid pT181 DNA in vitro: requirement for a plasmid-encoded product. Proc Natl Acad Sci U S A. 1981 Aug;78(8):4902–4906. doi: 10.1073/pnas.78.8.4902. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Koepsel R. R., Murray R. W., Rosenblum W. D., Khan S. A. The replication initiator protein of plasmid pT181 has sequence-specific endonuclease and topoisomerase-like activities. Proc Natl Acad Sci U S A. 1985 Oct;82(20):6845–6849. doi: 10.1073/pnas.82.20.6845. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kupersztoch-Portnoy Y. M., Miklos G. L., Helinski D. R. Properties of the relaxation complexes of supercoiled deoxyribonucleic acid and protein of the R plasmids R64, R28K, and R6K. J Bacteriol. 1974 Oct;120(1):545–548. doi: 10.1128/jb.120.1.545-548.1974. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Lovett M. A., Katz L., Helinski D. R. Unidirectional replication of plasmid ColE1 DNA. Nature. 1974 Sep 27;251(5473):337–340. doi: 10.1038/251337a0. [DOI] [PubMed] [Google Scholar]
- Manch-Citron J. N., Gennaro M. L., Majumder S., Novick R. P. RepC is rate limiting for pT181 plasmid replication. Plasmid. 1986 Sep;16(2):108–115. doi: 10.1016/0147-619x(86)90069-7. [DOI] [PubMed] [Google Scholar]
- Meyer T. F., Geider K. Enzymatic synthesis of bacteriophage fd viral DNA. Nature. 1982 Apr 29;296(5860):828–832. doi: 10.1038/296828a0. [DOI] [PubMed] [Google Scholar]
- Nossal N. G. Prokaryotic DNA replication systems. Annu Rev Biochem. 1983;52:581–615. doi: 10.1146/annurev.bi.52.070183.003053. [DOI] [PubMed] [Google Scholar]
- Novick R. P., Adler G. K., Majumder S., Khan S. A., Carleton S., Rosenblum W. D., Iordanescu S. Coding sequence for the pT181 repC product: a plasmid-coded protein uniquely required for replication. Proc Natl Acad Sci U S A. 1982 Jul;79(13):4108–4112. doi: 10.1073/pnas.79.13.4108. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Novick R. P., Brodsky R. Studies on plasmid replication. I. Plasmid incompatibility and establishment in Staphylococcus aureus. J Mol Biol. 1972 Jul 21;68(2):285–302. doi: 10.1016/0022-2836(72)90214-8. [DOI] [PubMed] [Google Scholar]
- Novick R. P., Smith K., Sheehy R. J., Murphy E. A catenated intermediate in plasmid replication. Biochem Biophys Res Commun. 1973 Oct 15;54(4):1460–1469. doi: 10.1016/0006-291x(73)91150-9. [DOI] [PubMed] [Google Scholar]
- Novick R. Plasmid-protein relaxation complexes in Staphylococcus aureus. J Bacteriol. 1976 Sep;127(3):1177–1187. doi: 10.1128/jb.127.3.1177-1187.1976. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sakakibara Y., Tomizawa J. I. Replication of colicin E1 plasmid DNA in cell extracts. Proc Natl Acad Sci U S A. 1974 Mar;71(3):802–806. doi: 10.1073/pnas.71.3.802. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Scott J. F., Eisenberg S., Bertsch L. L., Kornberg A. A mechanism of duplex DNA replication revealed by enzymatic studies of phage phi X174: catalytic strand separation in advance of replication. Proc Natl Acad Sci U S A. 1977 Jan;74(1):193–197. doi: 10.1073/pnas.74.1.193. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Sheehy R. J., Novick R. P. Studies on plasmid replication. V Replicative intermediates. J Mol Biol. 1975 Apr 5;93(2):237–253. doi: 10.1016/0022-2836(75)90130-8. [DOI] [PubMed] [Google Scholar]
- Staudenbauer W. L., Lanka E., Schuster H. Replication of small plasmids in extracts of Escherichia coli: involvement of the dnaB and dnaC protein in the replication of early replicative intermediates. Mol Gen Genet. 1978 Jul 4;162(3):243–249. doi: 10.1007/BF00268849. [DOI] [PubMed] [Google Scholar]
- Tomizawa J. Two distinct mechanisms of synthesis of DNA fragments on colicin E1 plasmid DNA. Nature. 1975 Sep 18;257(5523):253–254. doi: 10.1038/257253a0. [DOI] [PubMed] [Google Scholar]


