1
|
Abstract
The predominant protein-centric perspective in protein-DNA-binding studies assumes that the protein drives the interaction. Research focuses on protein structural motifs, electrostatic surfaces and contact potentials, while DNA is often ignored as a passive polymer to be manipulated. Recent studies of DNA topology, the supercoiling, knotting, and linking of the helices, have shown that DNA has the capability to be an active participant in its transactions. DNA topology-induced structural and geometric changes can drive, or at least strongly influence, the interactions between protein and DNA. Deformations of the B-form structure arise from both the considerable elastic energy arising from supercoiling and from the electrostatic energy. Here, we discuss how these energies are harnessed for topology-driven, sequence-specific deformations that can allow DNA to direct its own metabolism.
Collapse
|
2
|
Single strand DNA catenane synthesis using the formation of G-quadruplex structure. Bioorg Med Chem 2012; 20:2030-4. [DOI: 10.1016/j.bmc.2012.01.040] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2011] [Revised: 01/24/2012] [Accepted: 01/25/2012] [Indexed: 11/21/2022]
|
3
|
|
4
|
Ullsperger CJ, Vologodskii AV, Cozzarelli NR. Unlinking of DNA by Topoisomerases During DNA Replication. NUCLEIC ACIDS AND MOLECULAR BIOLOGY 1995. [DOI: 10.1007/978-3-642-79488-9_6] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
|
5
|
Sogo JM, Stahl H, Koller T, Knippers R. Structure of replicating simian virus 40 minichromosomes. The replication fork, core histone segregation and terminal structures. J Mol Biol 1986; 189:189-204. [PMID: 3023620 DOI: 10.1016/0022-2836(86)90390-6] [Citation(s) in RCA: 265] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The structure of replicating simian virus 40 (SV40) minichromosomes was studied by DNA crosslinking with trimethyl-psoralen. The procedure was used both in vitro with extracted SV40 minichromosomes as well as in vivo with SV40-infected cells. Both procedures gave essentially the same results. Mature SV40 minichromosomes are estimated to contain about 27 nucleosomes (error +/- 2), except for those molecules with a nucleosome-free gap, which are interpreted to contain 25 nucleosomes (error +/- 2). In replicative intermediates, nucleosomes are present in the unreplicated parental stem with the replication fork possibly penetrating into the nucleosomal DNA before the histone octamer is removed. Nucleosomes reassociate on the newly replicated DNA branches at distances from the branch point of 225 ( +/- 145) nucleotides on the leading strand and of 285( +/- 120) nucleotides on the lagging strand. In the presence of cycloheximide, daughter duplexes contained unequal numbers of nucleosomes, supporting dispersive and random segregation of parental nucleosomes. These were arranged in clusters with normal nucleosome spacing. We detected a novel type of interlocked dimer comprising two fully replicated molecules connected by a single-stranded DNA bridge. We cannot decide whether these dimers represent hemicatenanes or whether the two circles are joined by a Holliday-type structure. The joining site maps within the replication terminus. We propose that these dimers represent molecules engaged in strand segregation.
Collapse
|
6
|
Maxwell A, Gellert M. Mechanistic aspects of DNA topoisomerases. ADVANCES IN PROTEIN CHEMISTRY 1986; 38:69-107. [PMID: 3026152 DOI: 10.1016/s0065-3233(08)60526-4] [Citation(s) in RCA: 186] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
|
7
|
Cusick ME, DePamphilis ML, Wassarman PM. Dispersive segregation of nucleosomes during replication of simian virus 40 chromosomes. J Mol Biol 1984; 178:249-71. [PMID: 6092643 DOI: 10.1016/0022-2836(84)90143-8] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The distribution of preformed ("old") histone octamers between the two arms of DNA replication forks was analyzed in simian virus 40(SV40)-infected cells following treatment with cycloheximide to prevent nucleosome assembly from nascent histones. Viral chromatin synthesized in the presence of cycloheximide was shown to be deficient in nucleosomes. Replicating SV40 DNA (wild-type 800 and capsid assembly mutant, tsB11) was radiolabeled in either intact cells or nuclear extracts supplemented with cytosol. Nascent nucleosomal monomers were then released by extensive digestion of isolated nuclei, nuclear extracts or isolated viral chromosomes with micrococcal nuclease. The labeled nucleosomal DNA was purified and found to hybridize to both strands of SV40 DNA restriction fragments taken from each side of the origin of DNA replication, whereas Okazaki fragments hybridized only to the strand representing the retrograde DNA template. In addition, isolated, replicating SV40 chromosomes were digested with two strand-specific exonucleases that excised nascent DNA from either the forward or the retrograde side of replication forks. Pretreatment of cells with cycloheximide did not result in an excess of prenucleosomal DNA on either side of replication forks, but did increase the amount of internucleosomal DNA. These data are consistent with a dispersive model for nucleosome segregation in which "old" histone octamers are distributed to both arms of DNA replication forks.
Collapse
|
8
|
Liu LF. DNA topoisomerases--enzymes that catalyse the breaking and rejoining of DNA. CRC CRITICAL REVIEWS IN BIOCHEMISTRY 1983; 15:1-24. [PMID: 6319080 DOI: 10.3109/10409238309102799] [Citation(s) in RCA: 175] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|
9
|
Wolfson JS, Hooper DC, Swartz MN, McHugh GL. Antagonism of the B subunit of DNA gyrase eliminates plasmids pBR322 and pMG110 from Escherichia coli. J Bacteriol 1982; 152:338-44. [PMID: 6288663 PMCID: PMC221411 DOI: 10.1128/jb.152.1.338-344.1982] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The constructed plasmid pBR322 and the native plasmid pMG110 were eliminated (cured) from growing Escherichia coli cells by the antagonism of the B subunit of the bacterial enzyme DNA gyrase. The antagonism may be by the growth of cells (i) at semipermissive temperatures in a bacterial mutant containing a thermolabile gyrase B subunit or (ii) at semipermissive concentrations of coumermycin A1, an antibiotic that specifically inhibits the B subunit of DNA gyrase. The kinetics of plasmid elimination indicate that plasmid loss occurs too rapidly to be explained solely by the faster growth of that plasmid-free bacteria and, therefore, represents interference with plasmid maintenance.
Collapse
|
10
|
Tapper DP, Anderson S, DePamphilis ML. Distribution of replicating simian virus 40 DNA in intact cells and its maturation in isolated nuclei. J Virol 1982; 41:877-92. [PMID: 6284978 PMCID: PMC256824 DOI: 10.1128/jvi.41.3.877-892.1982] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The maturation of replicating simian virus 40 (SV40) chromosomes into superhelical viral DNA monomers [SV40(I) DNA] was analyzed in both intact cells and isolated nuclei to investigate further the role of soluble cytosol factors in subcellular systems. Replicating intermediates [SV40(RI) DNA] were purified to avoid contamination by molecules broken at their replication forks, and the distribution of SV40(RI) DNA as a function of its extent of replication was analyzed by gel electrophoresis and electron microscopy. With virus-infected CV-1 cells, SV40(RI) DNA accumulated only when replication was 85 to 95% completed. These molecules [SV40(RI(*)) DNA] were two to three times more prevalent than an equivalent sample of early replicating DNA, consistent with a rate-limiting step in the separation of sibling chromosomes. Nuclei isolated from infected cells permitted normal maturation of SV40(RI) DNA into SV40(I) DNA when the preparation was supplemented with cytosol. However, in the absence of cytosol, the extent of DNA synthesis was diminished three- to fivefold (regardless of the addition of ribonucleotide triphosphates), with little change in the rate of synthesis during the first minute; also, the joining of Okazaki fragments to long nascent DNA was inhibited, and SV40(I) DNA was not formed. The fraction of short-nascent DNA chains that may have resulted from dUTP incorporation was insignificant in nuclei with or without cytosol. Pulse-chase experiments revealed that joining, but not initiation, of Okazaki fragments required cytosol. Cessation of DNA synthesis in nuclei without cytosol could be explained by an increased probability for cleavage of replication forks. These broken molecules masqueraded during gel electrophoresis of replicating DNA as a peak of 80% completed SV40(RI) DNA. Failure to convert SV40(RI(*)) DNA into SV40(I) DNA under these conditions could be explained by the requirement for cytosol to complete the gap-filling step in Okazaki fragment metabolism: circular monomers with their nascent DNA strands interrupted in the termination region [SV40(II(*)) DNA] accumulated with unjoined Okazaki fragments. Thus, separation of sibling chromosomes still occurred, but gaps remained in the terminal portions of their daughter DNA strands. These and other data support a central role for SV40(RI(*)) and SV40(II(*)) DNAs in the completion of viral DNA replication.
Collapse
|
11
|
Maruyama K, Hiwasa T, Oda KI. Characterization of flat revertant cells isolated from simian virus 40-transformed mouse and rat cells which contain multiple copies of viral genomes. J Virol 1981; 37:1028-43. [PMID: 6262522 PMCID: PMC171100 DOI: 10.1128/jvi.37.3.1028-1043.1981] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Eight clones of flat revertants were isolated by negative selection from simian virus 40 (SV40)-transformed mouse and rat cell lines in which two and six viral genome equivalents per cell were integrated, respectively. These revertants showed either a normal cell phenotype or a phenotype intermediate between normal and transformed cells as to cellular morphology and saturation density and were unable to grow in soft agar medium. One revertant derived from SV40-transformed mouse cells was T antigen positive, whereas the other seven revertants were T antigen negative. SV40 could be rescued only from the T-antigen-positive revertant by fusion with permissive monkey cells. The susceptibility of the revertants to retransformation by wild-type SV40 was variable among these revertants. T-antigen-negative revertants from SV40-transformed mouse cells were retransformed at a frequency of 3 to 10 times higher than their grandparental untransformed cells. In contrast, T-antigen-negative revertants from SV40-transformed rat cells could not be retransformed. The arrangement of viral genomes was analyzed by digestion of cellular DNA with restriction enzymes of different specificity, followed by detection of DNA fragments containing a viral sequence and rat cells were serially arranged within the length of about 30 kilobases, with at least two intervening cellular sequences. A head-to-tail tandem array of unit length viral genomes was present in at least one insertion site in the transformed rat cells. All of the revertants had undergone a deletion(s), and only a part of the viral genome was retained in T-antigen-negative revertants. A relatively high frequency of reversion in the transformed rat cells suggests that reversion occurs by homologous recombination between the integrated viral genomes.
Collapse
|
12
|
|
13
|
Das GC, Niyogi SK. Structure, replication, and transcription of the SV40 genome. PROGRESS IN NUCLEIC ACID RESEARCH AND MOLECULAR BIOLOGY 1981; 25:187-241. [PMID: 6261296 DOI: 10.1016/s0079-6603(08)60485-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
|
14
|
Abstract
We have discovered that DNA gyrase interlocks duplex DNA circles to form catenanes and resolves catenanes into component monomers. The reactions were inhibited by novobiocin and oxolinic acid and required ATP, Mg++ and spermidine. DNA sequence homology is not involved in catenation, since hybrid catenanes were formed efficiently between supercoiled phi X174 and Col E1 DNA. Strikingly different results were obtained with native and relaxed Col E1 DNA substrates. Up to 50-60% of input native DNA was converted into oligomeric catenanes, predominantly dimers and trimers. Relaxed substrates were instead converted into vast interlocked networks and were occasionally knotted. Optimal catenation occurred only in the narrow range of 20-35 mM KCl; increased ionic strength blocked catenation completely but activated the back reaction of decatenation. Gyrase resolved both the oligomeric catenanes and interlocked networks it produced, as well as naturally occurring catenanes. These results imply that the mechanism of gyrase involves a transient double-strand break and passage of a DNA segment through the resulting gap. Gyrase is representative of a general class of enzymes, found in both procaryotic and eucaryotic cells, that facilitate diffusion of duplex DNA segments through each other and may thereby solve topological problems arising from the replication, recombination and condensation of DNA.
Collapse
|
15
|
Lau PP, Gray HB. Ethidium bromide-mediated renaturation of denatured closed circular DNAs. The nature of denaturation-resistant fractions of bacteriophage PM2 closed circular DNA. Nucleic Acids Res 1980; 8:673-701. [PMID: 7443539 PMCID: PMC327299 DOI: 10.1093/nar/8.3.673] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Addition of the intercalating dye ethidium bromide (EtdBr) to a solution of alkali-denatured double-stranded closed circular PM2, PhiX174, or lambdab(2)b(5)c phage DNAs, under conditions such that the solution remains strongly alkaline, can result in the renaturation of up to 100% of the DNA upon neutralization of the solution. For a fixed time of incubation of the alkaline dye-containing solution before neutralization, there exists a minimum concentration of the dye below which no EtdBr-mediated renaturation is observed for each species of closed circular DNA examined. These minimum concentrations increase, for a given DNA, with increasing ionic strength and temperature. The kinetics of accumulation of forms renaturing upon neutralization of alkaline solutions, at fixed concentrations of dye and DNA, are dependent upon the molecular weight and superhelix density of the starting DNA. After extended periods of incubation at a fixed ionic strength and temperature, however, the profiles of percentage of DNA renatured as a function of ethidium concentration become very similar for all the closed circular DNAs tested and display a transition from an absence of dye-mediated renaturation to virtually 100% renaturation upon neutralization over a small range of dye concentration. Circular DNA containing one or more strand scissions remains strand-separated under all the conditions used to effect the renaturation of closed circular DNA. These findings indicate that configurations of closed circular DNA, in which at least some of the complementary bases are apposed, can be selectively stabilized and accumulate in the presence of ethidium in solutions containing 0.19 N hydroxide ion. The closed circular DNA of bacteriophage PM2 has properties distinct from those of the other DNAs of this study in that it has been shown to contain fractions which exist in the base-paired duplex form after neutralization of strongly alkaline solutions of this DNA incubated at ambient temperature, while no duplex DNA is observed after exposure to alkali and neutralization of solutions of closed circular DNA from other sources. (1,2) The fraction of denaturation-resistant PM2 DNA is shown in the present work to depend upon the temperature and time of incubation in alkali, but not upon the superhelix density of the starting DNA. PM2 closed circular DNA also behaves anomalously with respect to its kinetics of accumulation of forms renaturing upon neutralization of alkaline, EtdBr-containing solutions. Evidence is presented that the translocation of one of the strands of a closed circular molecule relative to the other, which is required for the molecule to exist in the denatured form at neutral pH, is a process to which PM2 DNA is less labile than the other closed circular DNAs of this study.
Collapse
|
16
|
Seidman MM, Levine AJ, Weintraub H. The asymmetric segregation of parental nucleosomes during chrosome replication. Cell 1979; 18:439-49. [PMID: 227608 DOI: 10.1016/0092-8674(79)90063-1] [Citation(s) in RCA: 116] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
SV40 DNA replicated in the presence of cycloheximide was more sensitive to staphylococcal nuclease digestion and had a lower superhelical density than viral DNA replicated in the absence of this drug. These data indicate that fewer nucleosomes are associated with progeny SV40 DNA molecules after DNA replication in the absence of protein synthesis and that these nucleosomes are derived from the parental histones. We designed an experiment to determine whether these parental SV40 nucleosomes segregate to the leading side of the replication form where DNA synthesis is continuous, the lagging side of the fork where DNA synthesis is discontinuous or randomly to both sides of the fork. The results indicate that the parental histones distributed themselves asymmetrically, preferentially (80-90%) segregating with the leading side of both SV40 DNA replication forks during bidirectional replication in the absence of protein synthesis. In the case of SV40, the same parental DNA strands are the templates for the leading side of DNA replication at both forks as well as the templates for the informational or coding strand of early and late viral mRNA synthesis. Based on this correspondence, we designed an experiment to test whether chicken cells growing in culture and replicating their DNA in the absence of protein synthesis segregated their parental histones asymmetrically to the progeny DNA strand that also coded for stable nuclear RNA transcripts. The results of these experiments indicate that, like SV40, parental cellular histones segregate asymmetrically and are preferentially associated with those DNA template strands that code for stable nuclear RNA species detected by hybridization to single-copy DNA.
Collapse
|
17
|
Lau PP, Yu SH, Spring TG, Gray HB. A rapid method for the purification of supercoiled PM2 DNA by affinity chromatography on H1 histone covalently coupled to agarose. BIOCHIMICA ET BIOPHYSICA ACTA 1979; 563:313-9. [PMID: 465493 DOI: 10.1016/0005-2787(79)90050-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A simple and rapid method is described for the purification of supercoiled PM2 DNA by affinity chromatography on columns of H1 histone covalently coupled to agarose. The method does not require the use of intercalating agents or ultracentrifugation procedures. Under the conditions most appropriate for purification, elution is carried out in a single step with buffered 0.7 M NaCl after the sample has been loaded onto the column in buffered 0.2 M NaCl. The DNA eluted at the higher salt concentration consists of supercoiled closed circular DNA at greater than 90% purity independently of the ratio of supercoiled to nicked circular DNA in the input mixture.
Collapse
|
18
|
Shani M, Seidman M, Salzman NP. In vivo transcription on oligomeric simian virus 40 (SV40) DNA. Virology 1977; 83:110-9. [DOI: 10.1016/0042-6822(77)90214-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/27/1977] [Indexed: 10/26/2022]
|
19
|
Abstract
The assembly of new histones into nucleosomes and the segregation of old histones during replication were investigated using a density gradient, sedimentation equilibrium analysis of histones labeled in vivo with dense amino acids. After a 1 hr pulse of dense amino acids and 3H-lysine, nucleosomes were isolated from chick myoblast organ cultures, and the histones were cross-linked to octamers. The octamers were purified from DNA and then banded to equilibrium in cesium-formate guanidinium-HCI density gradients. The cross-linked dense octamers have the same density as the noncross-linked dense histones, and both were significantly heavier than histones synthesized in the presence of light amino acids. This experiment shows that new histone does not mix with old histone in the new nucleosomes, since the labeling protocol allows density labeling of only one histone for every seven preexisting unlabeled histones. Thus the assembly of new histone octamers is conservative. Using essentially the same experimental design, but varying the details of the labeling procedures, we also show that the dense histone octamer is stable over 3-4 generations, that neighboring octamers tend to be synthesized at the same time, and that old and new histone octamers segregate conservatively over 2-3 generations.
Collapse
|
20
|
Freifelder D, Baran N, Folkmanis A, Freifelder DL. Circular dimers of a lambda DNA in infected, nonlysogenic Escherichia coli. Virology 1977; 81:183-91. [PMID: 331660 DOI: 10.1016/0042-6822(77)90136-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Covalently closed circular dimers of phage lambda DNA have been found in Escherichia coli infected with lambda. These dimers can be formed by either the lambda Red or Int systems, by a nonrecombinational replicative mechanism requiring the activity of the lambda O and P genes or by joining of the cohesive ends. Dimers mediated by the E. coli Rec system have not been observed. Those formed by the Int system often result from recombination between different DNA molecules; however, the Red-mediated dimers may be a result of replicative extension of a single DNA molecule. Trimers have also been observed but studied only briefly.
Collapse
Affiliation(s)
- D Freifelder
- Department of Biochemistry, Brandeis University, Waltham, Massachusetts 02154, USA
| | | | | | | |
Collapse
|
21
|
|
22
|
Sakakibara Y, Suzuki K, Tomizawa JI. Formation of catenated molecules by replication of colicin E1 plasmid DNA in cell extracts. J Mol Biol 1976; 108:569-82. [PMID: 798034 DOI: 10.1016/s0022-2836(76)80137-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
23
|
Liberti P, Fischer-Fantuzzi L, Vesco C. Kinetics of DNA and histone messenger RNA synthesis in CV-1 monkey kidney cells infected with simian virus 40. J Mol Biol 1976; 105:263-73. [PMID: 184287 DOI: 10.1016/0022-2836(76)90111-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
24
|
Timmis K, Cabello F, Cohen SN. Covalently closed circular DNA molecules of low superhelix density as intermediate forms in plasmid replication. Nature 1976; 261:512-6. [PMID: 778630 DOI: 10.1038/261512a0] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
25
|
Crosa JH, Luttropp LK, Falkow S. Covalently closed circular DNA molecules deficient in superhelical density as intermediates in plasmid life cycle. Nature 1976; 261:516-9. [PMID: 934288 DOI: 10.1038/261516a0] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
|
26
|
Sogo JM, Greenstein M, Skalka A. The circle mode of replication of bacteriophage lambda: the role of covalently closed templates and the formation of mixed catenated dimers. J Mol Biol 1976; 103:537-62. [PMID: 781278 DOI: 10.1016/0022-2836(76)90216-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
27
|
Martin MA, Howley PM, Byrne JC, Garon CF. Characterization of supercoiled oligomeric SV40 DNA molecules in productively infected cells. Virology 1976; 71:28-40. [PMID: 179203 DOI: 10.1016/0042-6822(76)90091-x] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
28
|
Ganem D, Nussbaum AL, Davoli D, Fareed GC. Isolation, propagation and characterization of replication requirements of reiteration mutants of Simian Virus 40. J Mol Biol 1976; 101:57-83. [PMID: 176366 DOI: 10.1016/0022-2836(76)90066-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
29
|
Levine AJ, van der Vliet PC, Sussenbach JS. The replication of papovavirus and adenovirus DNA. Curr Top Microbiol Immunol 1976; 73:67-124. [PMID: 178481 DOI: 10.1007/978-3-642-66306-2_3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
|
30
|
Wu R, Geiduschek EP. The role of replication proteins in the regulation of bacteriophage T4 transcription. II. Gene 45 and late transcription uncoupled from replication. J Mol Biol 1975; 96:539-62. [PMID: 1195366 DOI: 10.1016/0022-2836(75)90138-2] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
|
31
|
|
32
|
|
33
|
|
34
|
Ostrander DA, Gray HB, Robberson DL. Catenanes of closed circular intracellular PM2 phage DNA. BIOCHIMICA ET BIOPHYSICA ACTA 1974; 349:296-304. [PMID: 4407516 DOI: 10.1016/0005-2787(74)90117-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
35
|
|
36
|
Goebel W, Kreft J. Complex Co1E1 DNA in Escherichia coli and Proteus mirabilis. MOLECULAR & GENERAL GENETICS : MGG 1974; 129:149-66. [PMID: 4598797 DOI: 10.1007/bf00268628] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
37
|
Nass MM. Temperature-dependent formation of dimers and oligomers of mitochondrial DNA in cells transformed by a thermosensitive mutant of Rous sarcoma virus. Proc Natl Acad Sci U S A 1973; 70:3739-43. [PMID: 4359487 PMCID: PMC427318 DOI: 10.1073/pnas.70.12.3739] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
In chick-embryo fibroblasts infected by T5, a temperature-sensitive mutant of Schmidt-Ruppin Rous sarcoma virus, the level of catenated dimeric and oligomeric mitochondrial DNA is temperature-dependent and correlates with the phenotypic manifestation of transformation. At the permissive temperature (36 degrees ), where transformation is expressed, the 2- to 3-fold elevated level characteristic of cells transformed by the wild-type Rous sarcoma virus was observed, but at the nonpermissive temperature (41 degrees ), at which cells appear normal and behave normally, the oligomer level was characteristic of uninfected cells. Temperature shifts from 41 to 36 degrees and vice versa resulted in phenotypic reversion and reversals of the respective levels of multiple-length DNA. Cellular growth rates were not altered. Treatment of control cells with cycloheximide resulted in a 5-fold increase of oligomeric DNA, whereas exposure to 9-beta-D-arabinofuranosyladenine had little effect. With both inhibitors, nuclear but not mitochondrial DNA synthesis was inhibited. The possible relation of formation of oligomeric mitochondrial DNA to alterations in the mitochondrial membranes of transformed cells and to inhibition of protein synthesis in the cytoplasm is discussed.
Collapse
|
38
|
Hofs EB, van Arkel GA, Baas PD, Ellens DJ, Jansz HS. Mechanism of formation of bacteriophage phiX174 circular and catenated dimer RF+ DNA. MOLECULAR & GENERAL GENETICS : MGG 1973; 126:37-51. [PMID: 4591368 DOI: 10.1007/bf00333480] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
|
39
|
Novick RP, Smith K, Sheehy RJ, Murphy E. A catenated intermediate in plasmid replication. Biochem Biophys Res Commun 1973; 54:1460-9. [PMID: 4754722 DOI: 10.1016/0006-291x(73)91150-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
|
40
|
|
41
|
|