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Robinson AC, Begg KJ, Sweeney J, Condie A, Donachie WD. Mapping and characterization of mutants of the Escherichia coli cell division gene, ftsA. Mol Microbiol 1988; 2:581-8. [PMID: 2846985 DOI: 10.1111/j.1365-2958.1988.tb00066.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Eight independent temperature-sensitive mutants of the cell division protein FtsA have been studied. They fall into two classes in terms of their behaviour at 42 degrees C and recovery at 30 degrees C. The first class shows salt-dependent temperature-sensitivity and reversible inactivation of FtsA protein at 42 degrees C. The second shows irreversible inactivation which is not prevented by salt. Recovery of the ability to divide at 30 degrees C is rapid in mutants of the first group, but is delayed for approximately a generation time in the second group. This suggests that irreversible inactivation of FtsA causes extensive damage to the division machinery. The amino acid substitutions show clustering to a limited domain of the protein, and one particular substitution is found in three of the mutants.
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Affiliation(s)
- A C Robinson
- Department of Molecular Biology, University of Edinburgh, UK
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2
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Fishel RA, Siegel EC, Kolodner R. Gene conversion in Escherichia coli. Resolution of heteroallelic mismatched nucleotides by co-repair. J Mol Biol 1986; 188:147-57. [PMID: 3522919 DOI: 10.1016/0022-2836(86)90300-1] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We have constructed heteroduplex plasmid DNA that is similar in structure to the heteroduplex DNA expected to be produced during genetic recombination of plasmids, and studied its repair after transformation into different Escherichia coli strains. The heteroduplex DNA was constructed using two different parental plasmids, each of which contained a different ten-nucleotide insertion mutation. The effect of different defined states of dam-methylation on repair was also examined. We found that heteroduplex DNA repair occurred prior to the replication of the substrate DNA 60 to 80% of the time, regardless of the state of DNA methylation. Most excision/synthesis tracts covered two markers separated by 1243 base-pairs, and this process has been termed co-repair. The most efficient co-repair pathway was the Dam-instructed repair pathway that required the mutH, mutL, mutS and uvrD gene products and preferentially used the methylated strand as the template for DNA synthesis. If there was no methylation asymmetry, mismatch nucleotide repair occurred with a similar frequency; however, no strand bias was observed. Co-repair of symmetrically methylated heteroduplex DNA required the mutS and uvrD gene products, while repair of unmethylated heteroduplex DNA also required the mutL and mutH gene products.
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Hansen EB, Atlung T, Hansen FG, Skovgaard O, von Meyenburg K. Fine structure genetic map and complementation analysis of mutations in the dnaA gene of Escherichia coli. MOLECULAR & GENERAL GENETICS : MGG 1984; 196:387-96. [PMID: 6094968 DOI: 10.1007/bf00436184] [Citation(s) in RCA: 60] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A fine structure genetic map of several mutations in the dnaA gene of Escherichia coli was constructed by the use of recombinant lambda and M13 phages. The dnaA508 mutation was found to be the mutation most proximal to the promoter, while the dnaA203 mutation was found to be the most distal one. The order of mutations established in this analysis was: dnaA508, dnaA167, (dnaA5, dnaA46, dnaA211), dnaA205, dnaA204, dnaA203. The mutations dnaA601, dnaA602, dnaA603, dnaA604 and dnaA606 were found to map very close to each other and close to dnaA205 in the middle third of the dnaA gene. In analysing the dominance relationship all 13 dnaA mutations were found to be recessive to the wild type. Characteristic phenotypes of the dnaA(Ts) mutants, like reversibility of the temperature inactivation of the dnaA protein, cold sensitivity of haploid or of merodiploid strains and suppressibility by rpoB mutations, are found to correlate with clusters of mutations within the gene.
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Kobayashi I, Ikeda H. Double Holliday structure: a possible in vivo intermediate form of general recombination in Escherichia coli. MOLECULAR & GENERAL GENETICS : MGG 1983; 191:213-20. [PMID: 6225938 DOI: 10.1007/bf00334816] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
From Escherichia coli cells we purified '8'-shaped dimeric molecules in which two circular DNA molecules of bacteriophage lambda were joined at a homologous site. Some of them had a complex junction which we interpreted as being two closely spaced Holliday structures because of (i) superhelicity of the molecule, (ii) the sedimentation rate of the molecule in sucrose gradients, and (iii) the appearance in the electron microscope. Other 'figure-eights's' had two separate homologous junctions, presumably two Holliday bridges. A possible role for these 'double Holliday structures' in UV-stimulated recA-dependent recombination in vivo is discussed.
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Doherty MJ, Morrison PT, Kolodner R. Genetic recombination of bacterial plasmid DNA. Physical and genetic analysis of the products of plasmid recombination in Escherichia coli. J Mol Biol 1983; 167:539-60. [PMID: 6308264 DOI: 10.1016/s0022-2836(83)80097-7] [Citation(s) in RCA: 75] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Derivatives of plasmid pBR322 DNA containing tet mutations were constructed by inserting XhoI linkers at various sites in the tetracycline resistance gene. Monomer plasmids containing either the tet-10 allele located at nucleotide position 23 or the tet-14 allele located at nucleotide position 1267 were used to construct a circular dimer containing one copy of each allele and a circular trimer containing one copy of the tet-10 allele and two copies of the tet-14 allele. Genetic recombination of these plasmid DNAs to produce a functional tetracycline resistance gene could be detected as the production of tetracycline-resistant progeny during the growth of transformants or using a restriction mapping assay which detected the rearrangement of the mutant alleles. The structure of individual tetracycline-resistant recombination products was determined by restriction mapping. This analysis suggested that as many as 70% of the plasmid recombination events in Escherichia coli AB1157 could have involved gene conversion events. The formation of these recombination products was most easily predicted by a model involving figure 8 recombination intermediates and the formation of symmetric regions of heteroduplex. Recombination in JC10287 delta(srlR-recA)304 occurred at 5% of the wild-type frequency and appeared to occur by a similar mechanism. Recombination in JC9604 recA56 recB21 recC22 sbcA23 occurred at 20 times the wild-type frequency and appeared to involve multiple independent recombination events.
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Abstract
We investigated, by density gradients and subsequent electron microscopy, vegetative T4 DNA after single or multiple infection of Escherichia coli with wild-type T4. Our results can be summarized as follows. (i) After single infection (i.e., when early intermolecular recombination could not occur), most, if not all, T4 DNA molecules initiated the first round of replication with a single loop. (ii) After multiple infection, recombinational intermediates containing label from both parents first appeared as early as 1 min after the onset of replication, long before all parental DNA molecules had finished their first round and before secondary replication was detectable. (iii) At the same time, in multiple infections only, complex, highly branched concatemeric T4 DNA first appeared. (iv) Molecules in which two loops or several branches were arranged in tandem were only found after multiple infections. (v) Secondary loops within primary loops were seen after both single and multiple infections, but they were rare and many appeared off center. Thus, recombination in wild-type T4-infected cells occurred very early, and the generation of multiple tandem loops or branches in vegetative T4 DNA depended on recombination. These results are consistent with the previous finding (A. Luder and G. Mosig, Proc. Natl. Acad. Sci. U.S.A. 79:1101-1105, 1982) that most secondary growing points of T4 are not initiated from origin sequences but from recombinational intermediates. By these and previous results, the various DNA molecules that we observed are most readily explained as intermediates in DNA replication and recombination according to a model proposed earlier to explain various other aspects of T4 DNA metabolism (Mosig et al., p. 277-295, in D. Ray, ed., The Initiation of DNA Replication, Academic Press, Inc., New York, 1981).
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Luder A, Mosig G. Two alternative mechanisms for initiation of DNA replication forks in bacteriophage T4: priming by RNA polymerase and by recombination. Proc Natl Acad Sci U S A 1982; 79:1101-5. [PMID: 7041114 PMCID: PMC345908 DOI: 10.1073/pnas.79.4.1101] [Citation(s) in RCA: 118] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
We show that bacteriophage T4 has two alternative mechanisms to initiate DNA replication; one dependent on Escherichia coli RNA polymerase (RNA nucleotidyltransferase, EC 2.7.7.6), and one dependent on general recombination. Continued DNA synthesis under recombination-defective conditions was sensitive to rifampin, an inhibitor of RNA polymerase. On the other hand, DNA synthesis accelerated in spite of the present of rifampin if recombination occurred.
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Fischhoff DA, Vovis GF, Zinder ND. Organization of chimeras between filamentous bacteriophage f1 and plasmid pSC101. J Mol Biol 1980; 144:247-65. [PMID: 6265643 DOI: 10.1016/0022-2836(80)90089-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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9
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Bialkowska-Hobrzańska H, Kunicki-Goldfinger JH. Mechanism of conjugation and recombination in bacteria XVI: single-stranded regions in recipient deoxyribonucleic acid during conjugation in Escherichia coli K-12. MOLECULAR & GENERAL GENETICS : MGG 1977; 151:319-26. [PMID: 325377 DOI: 10.1007/bf00268796] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The formation of mating pairs between F- and Hfr cells resulted in increased sensitivity of recipient deoxyribonucleic acid (DNA) to single-strand-specific S1 nuclease, from 3.6% to 23.5% after 30 min conjugation. A comparable amount of single strand regions in the DNA of mated wild type and recA mutant cells was detected. 10 min of conjugation resulted in almost the same amount of single-strand recipient DNA as 30 min of continuous transfer of donor DNA. Also the transfer of plasmid DNA from F+ recA strain led to the occurrence of single-strand recipient DNA. In similar experiments with Hfr tra mutant no such effect was observed. We conclude that alterations in the sechases of conjugation associated with the formation of mating pairs and/or initiation of transfer donor DNA.
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Powling A, Knippers R. Recombination of bacteriophage T7 in vivo. MOLECULAR & GENERAL GENETICS : MGG 1976; 149:63-71. [PMID: 1012267 DOI: 10.1007/bf00275961] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Most recombination following infection with T7 was found to coincide with the time of most repid DNA synthesis, at about 20 min after infection at 30 degrees in minimal medium. Recombining DNA was investigated electron microscopically. Multiply branched DNA structures were observed after infection with T7 wild type, gene 3-, gene 6- and genes 3-, 6- phage, but not after infection with T7 gene 5- phage. Evidence is presented indicating that these structures are T7 DNA molecules in the process of recombining. The detailed structures of these recombinational intermediates suggest mechanisms by which T7 DNA initiates recombination.
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Rommelaere J, Miller-Faurès A. Detection by density equilibrium centrifugation of recombinant-like DNA molecules in somatic mammalian cells. J Mol Biol 1975; 98:195-218. [PMID: 1195379 DOI: 10.1016/s0022-2836(75)80109-4] [Citation(s) in RCA: 41] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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15
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Enea V, Vovis GF, Zinder ND. Genetic studies with heteroduplex DNA of bacteriophage fl. Asymmetric segregation, base correction and implications for the mechanism of genetic recombination. J Mol Biol 1975; 96:495-509. [PMID: 1100850 DOI: 10.1016/0022-2836(75)90175-8] [Citation(s) in RCA: 83] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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16
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Vovis GF, Zinder ND. Methylation of f1 DNA by a restriction endonuclease from escherichia coli B. J Mol Biol 1975; 95:557-68. [PMID: 1097718 DOI: 10.1016/0022-2836(75)90317-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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17
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Horiuchi K, Vovis GF, Enea V, Zinder ND. Cleavage map of bacteriophage f1: location of the Escherichia coli B-specific modification sites. J Mol Biol 1975; 95:147-65. [PMID: 1102704 DOI: 10.1016/0022-2836(75)90388-5] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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18
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Bertani G. Deletions in bacteriophage P2. Circularity of the genetic map and its orientation relative to the DNA denaturation map. ACTA ACUST UNITED AC 1975; 136:107-37. [PMID: 16094979 DOI: 10.1007/bf00272034] [Citation(s) in RCA: 42] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Several types of viable chromosomal deletions of bacteriophage P2 were isolated. One type gives the immunity insensitive phenotype and may extend to the genes for the immunity repressor (C) and for integrative recombination (int). Two other types delete genes (old and fun) known to be active in the lysogenic state. For such deletion mutants the relationship between particle density and DNA length was established. The deletions were located in respect to previously mapped genes and the results were compared with electron microscopical studies (by Inman and collaborators) of the P2 chromosome. It is concluded that the best representation of the genetic map of P2 is circular. The cohesive ends of the linear P2 DNA molecule are most likely formed between genes old and Q. Except for the neighborhood of gene old, the previously published, linear genetic map of P2 (Lindahl) is colinear with the melting map of the P2 chromosome (Inman). Preliminary evidence for some specific recombination event often accompanying integrative recombination between phage chromosomes is presented.
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Affiliation(s)
- G Bertani
- Microbial Genetics Laboratory, Karolinska Institutet, Stockholm, Sweden
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19
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Benbow RM, Zuccarelli AJ, Sinsheimer RL. Recombinant DNA molecules of bacteriophage phi chi174. Proc Natl Acad Sci U S A 1975; 72:235-9. [PMID: 1054500 PMCID: PMC432278 DOI: 10.1073/pnas.72.1.235] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Phi chi174 DNA structures containing two different parental genomes were detected genetically and examined by electron microscopy. These structures consisted of two monomeric double-stranded DNA molecules linked in a figure 8 configuration. Such DNA structures were observed to be formed preferentially in host recA+ cells or recA+ cell-free systems. Since the host recA+ allele is required for most phi chi174 recombinant formation, we conclude that the observed figure 8 molecules are intermediates in, or end products of, 1 phi chi174 recombination event. We propose that recombinant figure 8 DNA molecules arise as a result of "single-strand aggression," are stabilized by double-strand "branch migration," and represent a specific example of a common intermediate in genetic recombination.
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20
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Sobell HM. A mechanism to activate branch migration between homologous DNA molecules in genetic recombination. Proc Natl Acad Sci U S A 1975; 72:279-83. [PMID: 1054504 PMCID: PMC432287 DOI: 10.1073/pnas.72.1.279] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
A mechanism to activate branch migration between homologous DNA molecules is described that leads to synapsis in genetic recombination. The model involves a restriction-like endonucleolytic enzyme that first nicks DNA (to produce single-strand breaks) on strands of opposite polarity at symmetrically arranged nucleotide sequences (located at ends of genes or operons). This is followed by local denaturation of the region, promoted by a single-strand-specific DNA binding protein (i.e., an unwinding protein). Hydrogen-bounding between homologous DNA molecules can then be initiated and this allows for subsequent propagation of hybrid DNA in the pathway to formation of the synapton structure.
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Pieczenik G, Model P, Robertson HD. Sequence and symmetry in ribosome binding sites of bacteriophage f1 RNA. J Mol Biol 1974; 90:191-124. [PMID: 4375722 DOI: 10.1016/0022-2836(74)90368-4] [Citation(s) in RCA: 68] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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22
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Vovis GF, Horiuchi K, Zinder ND. Kinetics of methylation of DNA by a restriction endonuclease from Escherichia coli B. Proc Natl Acad Sci U S A 1974; 71:3810-3. [PMID: 4610561 PMCID: PMC434273 DOI: 10.1073/pnas.71.10.3810] [Citation(s) in RCA: 60] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
The restriction endonuclease from E. coli B is both an endonuclease and a DNA methylase. Both activities either require or are stimulated by Mg(+2), adenosine triphosphate, and S-adenosyl-L-methionine. The particular activity which the enzyme exhibits depends upon the nature of the SB sites, the genetic sites that identify substrate DNA. Enzymatic treatment of DNA that has an unmodified, wild-type SB site results in either rapid restriction of the DNA or very slow methylation of the SB site. On the other hand, a hybrid SB site (modified), which protects the DNA molecule from restriction, results in rapid methylation of that SB site.
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23
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Powling A, Knippers R. Some functions involved in bacteriophage T7 genetic recombination. MOLECULAR & GENERAL GENETICS : MGG 1974; 134:173-80. [PMID: 4617162 DOI: 10.1007/bf00268418] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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24
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Fogel S, Roth R. Mutations affecting meiotic gene conversion in yeast. MOLECULAR & GENERAL GENETICS : MGG 1974; 130:189-201. [PMID: 4602259 DOI: 10.1007/bf00268799] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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25
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Schlaeger EJ, Spatz HC. Specific recognition in gene conversion. The extent of repair synthesis in SPP1 transfection of B. subtilis. MOLECULAR & GENERAL GENETICS : MGG 1974; 130:165-75. [PMID: 4209420 DOI: 10.1007/bf00269087] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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26
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Hartman N, Zinder ND. The effect of B specific restriction and modification of DNA on linkage relationships in f1 bacteriophage. J Mol Biol 1974; 85:357-69. [DOI: 10.1016/0022-2836(74)90438-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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27
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Hartman N, Zinder ND. The effect of B specific restriction and modification of DNA on linkage relationships in f1 bacteriophage. J Mol Biol 1974; 85:345-56. [DOI: 10.1016/0022-2836(74)90437-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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Benbow RM, Zuccarelli AJ, Davis GC, Sinsheimer RL. Genetic recombination in bacteriophage phi chi 174. J Virol 1974; 13:898-907. [PMID: 4595301 PMCID: PMC355388 DOI: 10.1128/jvi.13.4.898-907.1974] [Citation(s) in RCA: 46] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Genetic recombination in bacteriophage phiX174 usually takes place early in the infection process and involves two parental replicative form (double-stranded) DNA molecules. The host recA protein is required; none of the nine known phiX174 cistron products is essential. The products of a single recombination event are nonreciprocal and asymmetric. Typically, only one of the parental genotypes and one recombinant genotype are recovered from a single cell. An alternative, less efficient recombination mechanism which requires an active phiX174 cistron A protein is observed in the absence of the host recA gene product.
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29
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Effect of the proportion of parental nuclei in a heterokaryon on the pattern of gene conversion in Sordaria fimicola. ACTA ACUST UNITED AC 1974. [DOI: 10.1007/bf00269386] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Bertani G, Bertani LE. Constitutive expression of bacteriophage P2 early genes resulting from a tandem duplication. Proc Natl Acad Sci U S A 1974; 71:315-9. [PMID: 4521805 PMCID: PMC387994 DOI: 10.1073/pnas.71.2.315] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
A tandem-duplication mutant of bacteriophage P2 was isolated. Physically, its particles are characterized by a higher buoyant density and lower heat stability than the wild type, both consequences of increased DNA content. Genetically, the mutant is easily recognized by its insensitivity to control by the immunity-specific repressor. The duplication covers part of gene B, necessary for phage DNA replication. To explain the immunity-insensitivity of the duplication it is proposed that the promoter, but not the operator site, in the early gene operon is duplicated in this mutant. By crosses with a gene-B mutant, a recombinant carrying a heterozygous duplication was isolated.
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32
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Horiuchi K, Vovis GF, Zinder ND. Effect of Deoxyribonucleic Acid Length on the Adenosine Triphosphatase Activity of Escherichia coli Restriction Endonuclease B. J Biol Chem 1974. [DOI: 10.1016/s0021-9258(19)43064-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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33
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Arber W. DNA modification and restriction. PROGRESS IN NUCLEIC ACID RESEARCH AND MOLECULAR BIOLOGY 1974; 14:1-37. [PMID: 4602489 DOI: 10.1016/s0079-6603(08)60204-4] [Citation(s) in RCA: 214] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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34
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Vovis GF, Horiuchi K, Hartman N, Zinder ND. Restriction endonuclease B and f1 heteroduplex DNA. NATURE: NEW BIOLOGY 1973; 246:13-6. [PMID: 4586117 DOI: 10.1038/newbio246013a0] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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35
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Doniger J, Warner RC, Tessma I. Role of circular dimer DNA in the primary recombination mechanism of bacteriophage S13. NATURE: NEW BIOLOGY 1973; 242:9-12. [PMID: 4511842 DOI: 10.1038/newbio242009a0] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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36
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Crawford IP, Preiss J. Distribution of closely linked markers following intragenic recombination in Escherichia coli. J Mol Biol 1972; 71:717-33. [PMID: 4567472 DOI: 10.1016/s0022-2836(72)80034-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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37
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Sigal N, Alberts B. Genetic recombination: the nature of a crossed strand-exchange between two homologous DNA molecules. J Mol Biol 1972; 71:789-93. [PMID: 4648347 DOI: 10.1016/s0022-2836(72)80039-1] [Citation(s) in RCA: 195] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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38
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Melechen NE, Hudnik-Plevnik TA. Precursor and product in bacteriophage lambda recombination. Proc Natl Acad Sci U S A 1972; 69:3195-8. [PMID: 4564207 PMCID: PMC389734 DOI: 10.1073/pnas.69.11.3195] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Analyses of the time of recombination in bacteria infected with phage lambda and in spheroplasts infected with purified phage lambda DNA indicate a preponderance of recombination occurring before replication ("early recombination") after infection with tandem dimers formed in vitro compared to linear monomer DNA and phage infections. Among the early recombinants is a large fraction of cells that produces one recombinant type exclusively. Two suggestions are discussed-that a dimer-like molecule is the precursor of the recombinant progeny molecule and that one recombinant chromosome is the frequent or exclusive product of a recombinational event.
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39
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Horiuchi K, Zinder ND. Cleavage of bacteriophage fl DNA by the restriction enzyme of Escherichia coli B. Proc Natl Acad Sci U S A 1972; 69:3220-4. [PMID: 4564208 PMCID: PMC389740 DOI: 10.1073/pnas.69.11.3220] [Citation(s) in RCA: 83] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
We studied the cleavage of the replicative-form DNA (RF I) of bacteriophage f1 and its SB mutants by purified restriction endonuclease of E. coli B. The results indicate that: (i) Circular replicative forms are broken once to yield full-length linear molecules (RF III). Such linear molecules are less susceptible than RF I to endonuclease R-B. (ii) The genetic sites (SB sites) that confer on the DNA susceptibility to B-restriction are not the actual sites of cleavage. The number of possible cleavage sites is larger than the number of SB sites. We conclude this because an RF III molecule produced by endonuclease R-B from RF I of a mutant that has only one SB site can be circularized by denaturation and renaturation. (iii) The SB site is not modified when the DNA is cleaved, since an SB site can be used repeatedly by endonuclease R-B; the RF III described in ii can be cleaved by the same enzyme after denaturation and renaturation.
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40
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Benbow RM, Eisenberg M, Sinsheimer RL. Multiple length DNA molecules of bacteriophage phi-X174. NATURE: NEW BIOLOGY 1972; 237:141-4. [PMID: 4504192 DOI: 10.1038/newbio237141a0] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Smith JD, Arber W, Kühnlein U. Host specificity of DNA produced by Escherichia coli. XIV. The role of nucleotide methylation in in vivo B-specific modification. J Mol Biol 1972; 63:1-8. [PMID: 4552762 DOI: 10.1016/0022-2836(72)90517-7] [Citation(s) in RCA: 71] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Kühnlein U, Arber W. Host specificity of DNA produced by Escherichia coli. XV. The role of nucleotide methylation in in vitro B-specific modification. J Mol Biol 1972; 63:9-19. [PMID: 4552763 DOI: 10.1016/0022-2836(72)90518-9] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Roth R, Fogel S. A system selective for yeast mutants deficient in meiotic recombination. MOLECULAR & GENERAL GENETICS : MGG 1971; 112:295-305. [PMID: 5129795 DOI: 10.1007/bf00334431] [Citation(s) in RCA: 59] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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