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Affiliation(s)
- E Peter Geiduschek
- Division of Biological Sciences, Section of Molecular Biology, University of California, San Diego, La Jolla, California 92093, USA.
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2
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Monge ME, D'Anna B, George C. Nitrogen dioxide removal and nitrous acid formation on titanium oxide surfaces—an air quality remediation process? Phys Chem Chem Phys 2010; 12:8991-8. [DOI: 10.1039/b925785c] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
This is a memoir of circumstances that have shaped my life as a scientist, some of the questions that have excited my interest, and some of the people with whom I have shared that pursuit. I was introduced to transcription soon after the discovery of RNA polymerase and have been fascinated by questions relating to gene regulation since that time. My account touches on early experiments dealing with the ability of RNA polymerase to selectively transcribe its DNA template. Temporal programs of transcription that control the multiplication cycles of viruses (phages) and the precise mechanisms generating this regulation have been a continuing source of fascination and new challenges. A longtime interest in eukaryotic RNA polymerase III has centered on yeast and on the enumeration and properties of its transcription initiation factors, the architecture of its promoter complexes, and the mechanism of transcriptional initiation. These areas of research are widely regarded as separate, but to my thinking they have posed similar questions, and I have been unwilling or unable to abandon either one for the other. An additional interest in archaeal transcription can be seen as stemming naturally from this point of view.
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Affiliation(s)
- E Peter Geiduschek
- Division of Biological Sciences, University of California-San Diego, La Jolla, CA 92093-0634, USA.
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Kleffmann J. Daytime Sources of Nitrous Acid (HONO) in the Atmospheric Boundary Layer. Chemphyschem 2007; 8:1137-44. [PMID: 17427162 DOI: 10.1002/cphc.200700016] [Citation(s) in RCA: 139] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Nitrous acid (HONO) is an important precursor of the hydroxyl radical (OH), the self-cleaning agent of the atmosphere and a key species in the formation of harmful photooxidants during summer smog. Recent field measurements using very sensitive HONO instruments have shown that daytime HONO concentrations are much higher than has been assumed previously and that the contribution of HONO to the radical formation was underestimated in the past. A strong photochemical HONO source has been proposed, which contributes to the primary OH radical production up to 56 %. These exciting results initiated new laboratory studies, in which new sources of HONO have been identified. It is demonstrated that HONO is photochemically formed 1) on surfaces treated with nitric acid, 2) by reduction of NO(2) on photosensitized organic surfaces like humic acids and c) in the gas phase photolysis of ortho-substituted nitroaromatics. Although significant uncertainties still exist on the exact mechanisms, these additional sources might explain daytime observations in the atmosphere and demonstrate that HONO should be generally measured in field campaigns, besides other radical sources.
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Affiliation(s)
- Jörg Kleffmann
- Physikalische Chemie/FB C, Bergische Universität Wuppertal, Gaussstrasse 20, 42119 Wuppertal, Germany.
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Orgel LE. The chemical basis of mutation. ADVANCES IN ENZYMOLOGY AND RELATED AREAS OF MOLECULAR BIOLOGY 2006; 27:289-346. [PMID: 4885008 DOI: 10.1002/9780470122723.ch6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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6
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Rayat S, Majumdar P, Tipton P, Glaser R. 5-Cyanoimino-4-oxomethylene-4,5-dihydroimidazole and 5-Cyanoamino-4-imidazolecarboxylic Acid Intermediates in Nitrosative Guanosine Deamination: Evidence from 18O-Labeling Experiments. J Am Chem Soc 2004; 126:9960-9. [PMID: 15303870 DOI: 10.1021/ja049835q] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The nitrosative deaminations (37 degrees C, NaNO2, NaAc buffer, pH 3.7) of guanosine 1r in (18O)water (97.6%) and of [6-18O]-1r in normal water were studied. [6-(18)O]-1r was prepared from 2-amino-6-chloropurine riboside using adenosine deaminase. The reaction products xanthosine 3r and oxanosine 4r were separated by HPLC and characterized by LC/MS analysis and 13C NMR spectroscopy. The 18O-isotopic shifts on the 13C NMR signals were measured and allowed the identification of all isotopomers formed. The results show that oxanosine is formed via 5-cyanoimino-4-oxomethylene-4,5-dihydroimidazole, 5, and its 1,4-addition product 5-cyanoamino-4-imidazolecarboxylic acid, 6. This hydration of 5 to 6 leads to aromatization and greatly dominates over water addition to the cyanoimino group of 5 to form 5-guanidinyliden-4-oxomethylene-4,5-dihydroimidazole, 7. 5-Guanidinyl-4-imidazolecarboxylic acid, 8, the product of water addition to 6, is not involved.
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Affiliation(s)
- Sundeep Rayat
- Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211, USA
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7
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Edfeldt NBF, Harwood EA, Sigurdsson ST, Hopkins PB, Reid BR. Solution structure of a nitrous acid induced DNA interstrand cross-link. Nucleic Acids Res 2004; 32:2785-94. [PMID: 15155847 PMCID: PMC419607 DOI: 10.1093/nar/gkh606] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Nitrous acid is a mutagenic agent. It can induce interstrand cross-links in duplex DNA, preferentially at d(CpG) steps: two guanines on opposite strands are linked via a single shared exocyclic imino group. Recent synthetic advances have led to the production of large quantities of such structurally homogenous cross-linked duplex DNA. Here we present the high resolution solution structure of the cross-linked dodecamer [d(GCATCCGGATGC)]2 (the cross-linked guanines are underlined), determined by 2D NMR spectroscopy, distance geometry, restrained molecular dynamics and iterative NOE refinement. The cross-linked guanines form a nearly planar covalently linked 'G:G base pair' with only minor propeller twisting, while the cytidine bases of their normal base pairing partners have been flipped out of the helix and adopt well defined extrahelical positions in the minor groove. On the 5'-side of the cross-link, the minor groove is widened to accommodate these extrahelical bases, and the major groove becomes quite narrow at the cross-link. The cross-linked 'G:G base pair' is well stacked on the spatially adjacent C:G base pairs, particularly on the 3'-side guanines. In addition to providing the first structure of a nitrous acid cross-link in DNA, these studies could be of major importance to the understanding of the mechanisms of nitrous acid cross-linking and mutagenicity, as well as the mechanisms responsible for its repair in intracellular environments. It is also the shortest DNA cross-link structure to be described.
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Rayat S, Glaser R. 5-Cyanoimino-4-oxomethylene-4,5-dihydroimidazole and Nitrosative Guanine Deamination. A Theoretical Study of Geometries, Electronic Structures, and N-Protonation. J Org Chem 2003; 68:9882-92. [PMID: 14682679 DOI: 10.1021/jo0351522] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The 5-cyanoimino-4-oxomethylene-4,5-dihydroimidazole 1 (R = H), its N1-derivatives 2 (R = Me) and 3 (R = MOM) and their cyano-N (4, 6, 8) and imino-N protonated (5, 7, 9) derivatives were studied with RHF, B3LYP, and MP2 theory. Solvation effects were estimated with the isodensity polarized continuum model (IPCM) at the MP2 level using the dielectric constant of water. Carbodiimide 10, cyanamide 12, N-cyanomethyleneimine 13, and its protonated derivatives 14 and 15 were considered for comparison as well. Adequate theoretical treatment requires the inclusion of dispersion because of the presence of intramolecular van der Waals, charge-dipole, and dipole-dipole (including H-bonding) interactions. All conformers were considered for the MOM-substituted systems, and direct consequences on the preferred site of protonation were found. The vicinal push (oxomethylene)-pull (cyanoimino) pattern of the 5-cyanoimino-4-oxomethylene-4,5-dihydroimidazoles results in the electronic structure of aromatic imidazoles with 4-acylium and 5-cyanoamido groups. The gas-phase proton affinities of 1-3 are over 30 kcal/mol higher than that for N-cyanomethyleneimine 13, and this result provides compelling evidence in support of the zwitterionic character of 1-3. Protonation enhances the push-pull interaction; the OC charge is increased from about one-half in 1-3 to about two-thirds in the protonated systems. In the gas phase, cyano-N protonation is generally preferred but imino-N protonation can compete if the R-group contains a suitable heteroatom (hydrogen-bond acceptor, Lewis base). In polar solution, however, imino-N protonation is generally preferred. Solvation has a marked consequence on the propensity for protonation. Whereas protonation is fast and exergonic in the gas phase, it is endergonic in the polar condensed phase. It is an immediate consequence of this result that the direct observation of the cations 8 and 9 should be possible in the gas phase only.
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Affiliation(s)
- Sundeep Rayat
- Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211, USA
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9
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Glaser R, Rayat S, Lewis M, Son MS, Meyer S. Theoretical Studies of DNA Base Deamination. 2. Ab Initio Study of DNA Base Diazonium Ions and of Their Linear, Unimolecular Dediazoniation Paths,. J Am Chem Soc 1999. [DOI: 10.1021/ja9841254] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Rainer Glaser
- Contribution from the Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211
| | - Sundeep Rayat
- Contribution from the Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211
| | - Michael Lewis
- Contribution from the Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211
| | - Man-Shick Son
- Contribution from the Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211
| | - Sarah Meyer
- Contribution from the Department of Chemistry, University of Missouri-Columbia, Columbia, Missouri 65211
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CARBON JA. THE EFFECTS OF NITROUS ACID ON THE ACTIVITY OF ESCHERICHIA COLI TRANSFER RIBONUCLEIC ACID. ACTA ACUST UNITED AC 1996; 95:550-60. [PMID: 14324807 DOI: 10.1016/0005-2787(65)90509-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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11
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Glaser R, Son MS. Pyrimidine Ring Opening in the Unimolecular Dediazoniation of Guanine Diazonium Ion. An Ab Initio Theoretical Study of the Mechanism of Nitrosative Guanosine Deamination. J Am Chem Soc 1996. [DOI: 10.1021/ja961334k] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rainer Glaser
- Department of Chemistry University of MissouriColumbia Columbia, Missouri 65211
| | - Man-Shick Son
- Department of Chemistry University of MissouriColumbia Columbia, Missouri 65211
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12
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Basak J, Chatterjee SN. Induction of adaptive response by nitrofurantoin against oxidative DNA damage in some bacterial cells. Mutat Res 1994; 321:127-32. [PMID: 7513062 DOI: 10.1016/0165-1218(94)90036-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Pretreatment with a sublethal dose of nitrofurantoin did not give any protection to Vibrio cholerae OGAWA 154 (wild-type) cells against subsequent treatment with challenging doses of MNNG and vice versa. However, pretreatment with a sublethal dose of nitrofurantoin offered significant protection to the bacterial cells against subsequent treatment with challenging doses of H2O2 and vice versa. Further, sublethal doses of nitrofurantoin or H2O2 produced almost the same degree of protection against challenges by H2O2 or nitrofurantoin. Both the alkylating agent MNNG and the oxidative agent H2O2 induced adaptive responses in Vibrio cholerae OGAWA 154 cells against subsequent challenge by the respective agents. The experiments presented in this communication revealed that nitrofurantoin produced an adaptive response in bacterial cells against oxidative and not alkylating DNA damage.
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Affiliation(s)
- J Basak
- Biophysics Division, Saha Institute of Nuclear Physics, Calcutta, India
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13
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Hartman Z, Henrikson EN, Hartman PE, Cebula TA. Molecular models that may account for nitrous acid mutagenesis in organisms containing double-stranded DNA. ENVIRONMENTAL AND MOLECULAR MUTAGENESIS 1994; 24:168-175. [PMID: 7957120 DOI: 10.1002/em.2850240305] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Nitrous acid (NA) is often presumed to cause base substitutions in organisms with double-stranded DNA as a direct consequence of oxidative deamination of adenine and of cytosine residues. Here we summarize evidence indicating that other mechanisms are involved in the case of NA-induced G/C-->A/T transition mutations. We present several models for pathways of NA mutagenesis that may account for our experimental results and overlapping data noted in the literature. One model proposes that the base substitution mutations observed are due to DNA alkylation damage mediated via nitrosation of polyamines and/or other ubiquitous cellular molecules. Other models assume that predisposing lesions, such as G-to-G cross-links, are first formed. The cross-links are pictured as leading to perturbations in DNA structure that allow subsequent opportunity for NA-induced deaminations of cytosine residues in their immediate vicinity. The deaminations preferentially result in G/C-->A/T transition mutations at sites highly dependent on adjoining base sequence context (i.e., in NA "mutational hotspots"). A final model proposes that NA-induced G/C-->A/T transition mutations arise mainly from oxidative deamination of guanosine residues and not from deamination of cytosine residues in duplex DNA.
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Affiliation(s)
- Z Hartman
- Department of Biology, Johns Hopkins University, Baltimore, Maryland 21218-2685
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Balbinder E, Kerry D, Reich CI. Deletion induction in bacteria. I. The role of mutagens and cellular error-prone repair. Mutat Res 1983; 112:147-68. [PMID: 6408473 DOI: 10.1016/0167-8817(83)90037-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The amber mutation trpD28 of Salmonella typhimurium shows a complex reversion pattern on anthranilate (AA)-supplemented minimal medium. Under such conditions it is possible to recover revertants of two phenotypes, prototrophs (MM+) and anthranilate utilizers (AA+), each phenotype brought about by several mutational events. Since one class of AA+ revertants is caused by deletion of the trpD28 mutation, this constitutes a useful system for quantitative studies of the effects of mutagenic agents and cellular factors on the production of deletions. In the present study we have tried to assess the relative contribution of chemical mutagens vs. cellular mutator factors in causing this class of mutations. Strains of S. typhimurium in which the spontaneous reversion rate of trpD28 was modified by pKM101, (strain SO1007), mutL (strain SO1018) and both (strain SO1008), as well as the wild type (strain SO939) were treated with nitrous acid (HNO2) and mitomycin C (MC), mutagens reported to induce deletions in bacteria. The results showed that while the absolute frequency of deletions increased exponentially with dose of mutagen in parallel with the total reversion frequency, the relative frequency (percent) of these mutations was characteristic for each strain and for the most part unaffected by the dose of mutagen. It appears that deletions, spontaneous or induced, occur as a fixed percentage of total mutations and are brought about by the cells' own repair capacity and characteristic DNA metabolism. Perhaps these mutations are the result of untargeted events during SOS misrepair.
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Konopa J, Pawlak JW, Pawlak K. The mode of action of cytotoxic and antitumor 1-nitroacridines. III. In vivo interstrand cross-linking of DNA of mammalian or bacterial cells by 1-nitroacridines. Chem Biol Interact 1983; 43:175-97. [PMID: 6402315 DOI: 10.1016/0009-2797(83)90094-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
To define a critical lesion in presumable target DNA cause in vivo by the antitumor and cytotoxic 1-nitroacridines, Ehrlich ascites tumor (Eat) cells implanted into mice, HeLa cells grown in monolayer culture or Bacillus subtilis SB 1058 strain cells were exposed to Ledakrin [Nitracrine; 1-nitro-9-(3'-dimethylamino-n-propylamino)acridine], its non-antitumor congeners, or mitomycin C tested for comparison; total intracellular DNA was isolated from control or treated cells and denatured by heat, alkali or formamide, after which the chemically-induced fraction of interstrand cross-linked DNA molecules was assessed by thermal denaturation-renaturation curve analysis, hydroxylapatite column chromatography, or partitioning in a Dextran T500-polyethylene glycol 6000 biphasic system. Ledakrin, as compared to mitomycin C, was a very effective cross-linking agent, inducing one covalent cross-link per approx. 20 X 10(3) (B. subtilis), 56 X 10(3) (HeLa) or 80 X 10(3) (Eat) DNA base pairs. The first cross-links were introduced in B. subtilis cell genomes at minimal bactericidal concentrations of Ledakrin of mitomycin C. Ledakrin failed to induce discernible cross-linking of bihelical DNA when complexed with in cell-free system. Unlike the other two 1-nitroacridines which cross-linked DNA of cultured HeLa or B. subtilis cells, the non-antitumor 2-, 3- or 4-nitroacridines did not cause such effect and diminished cross-linking by Ledakrin or mitomycin C. Hence, upon metabolic activation in mammalian or bacterial cell Ledakrin and, most probably other 1-nitroacridines, become very effective DNA cross-linking agents and such effects appear to be responsible for the antitumor and potent cytotoxic activities of 1-nitroacridines.
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Alston TA, Seitz SP, Bright HJ. Conversion of 3-nitro-1-propanol (miserotoxin aglycone) to cytotoxic acrolein by alcohol dehydrogenase. Biochem Pharmacol 1981; 30:2719-20. [PMID: 7028044 DOI: 10.1016/0006-2952(81)90545-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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18
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Frankel AD, Duncan BK, Hartman PE. Nitrous acid damage to duplex deoxyribonucleic acid: distinction between deamination of cytosine residues and a novel mutational lesion. J Bacteriol 1980; 142:335-8. [PMID: 6989809 PMCID: PMC293965 DOI: 10.1128/jb.142.1.335-338.1980] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
The rate of nitrous acid deamination of labeled cytosine residues in native Escherichia coli deoxyribonucleic acid was monitored in vitro by release of acid-soluble counts after treatment with uracil deoxyribonucleic acid glycosylase. The reaction exhibited a lag and was not stimulate by several agents previously shown to enhance base substitution mutagenesis during nitrous acid treatment of duplex deoxyribonucleic acid. We conclude that a significant proportion of nitrous acid induced mutagenic lesions are novel lesions and not cytosine deaminations.
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19
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Fleer R, Brendel M. Formation and fate of cross-links induced by polyfunctional anticancer drugs in yeast. MOLECULAR & GENERAL GENETICS : MGG 1979; 176:41-52. [PMID: 396449 DOI: 10.1007/bf00334294] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A method to detect low levels of interstrand cross-links in DNA of Saccharomyces cerevisiae is described. Isopycnic ultracentrifugation of alkali-treated, unpurified Eaton press homogenates allows the detection of less than one cross-link per yeast chromosome. Efficient separation of single- and double-stranded DNA requires low cell density and addition of glycerol during homogenization. Using a yeast strain defective in excision repair, a dose dependent formation of interstrand cross-links after treatment of cells with biological doses of nitrogen mustard, Triaziquone and Chloramubil could be demonstrated. The most powerful of these alkylating agents is Triziquone: half of the DNA molecules are shown to be cross-linked after a 12 min exposure to 9 X 10(-9) g/ml of the drug. The cross-linking reaction continues after excessive alkylating agent is removed. After having reached a maximum the fraction of renaturable DNA decreases upon further incubation. The speed of this "after-reaction" depends on temperature: 48 h after the end of treatment renaturability of DNA has almost completely disappeared when cells are kept at 36 degrees C.
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20
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Kuhnlein U, Tsang SS, Edwards J. Characterization of DNA damages by filtration through nitrocellulose filters: a simple probe for DNA-modifying agents. Mutat Res 1979; 64:167-82. [PMID: 470967 DOI: 10.1016/0165-1161(79)90102-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A simple technique for the detection of DNA-modifying agents is described. The double-stranded covalently closed circular DNA of phage PM2 is exposed to the modifying agent and then analysed for DNA damages by assays involving only incubation steps and filtration through nitrocellulose filters. The technique described allows the measurement of DNA modifications which lead to local denaturation of the DNA double helix, interstrand cross-links, single- and double-strand breaks, damages which render the phosphodiester bonds of the DNA sensitive to hydrolysis and damages which labilise the glycosylic bond between base and sugar moiety.
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21
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The Repair of DNA Modified by Cytotoxic, Mutagenic, and Carcinogenic Chemicals. ACTA ACUST UNITED AC 1978. [DOI: 10.1016/b978-0-12-035407-8.50012-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
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22
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Legerski R, Gray H, Robberson D. A sensitive endonuclease probe for lesions in deoxyribonucleic acid helix structure produced by carcinogenic or mutagenic agents. J Biol Chem 1977. [DOI: 10.1016/s0021-9258(19)75284-3] [Citation(s) in RCA: 63] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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23
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Bernstein H. Germ line recombination may be primarily a manifestation of DNA repair processes. J Theor Biol 1977; 69:371-80. [PMID: 339000 DOI: 10.1016/0022-5193(77)90144-8] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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24
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Nonn EM, Bernstein C. Multiplicity reactivation and repair of nitrous acid-induced lesions in bacteriophage T4. J Mol Biol 1977; 116:31-47. [PMID: 592384 DOI: 10.1016/0022-2836(77)90117-6] [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: 12/23/2022]
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25
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Abstract
The effect of nitrous acid (NA) on viability, integrity of cellular DNA and on membrane transport were studied in 5 strains of Escherichia coli. Stationary phase cells, grown on mineral salts medium, were exposed to NA. The viability of strains decreased in thefollowing order: W3110 wild-type greater than WP2 wild-type, WP2 uvrA greater than NG30 recA greater than P3478 polA. Alterations were found in the DNA sedimentation profile in alkaline sucrose gradient. Disturbance of DNA synthesis was measured by 3H-labelled thymidine ([3H]Thd) incorporation. No degradation of DNA was found after NA treatment. Low doses of NA caused significant inhibition of leucine and glucose transport into whole cells. The results are interpreted in terms of the multi-target action of NA causing the death of cells.
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26
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27
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Bernstein C, Morgan D, Gensler HL, Schneider S, Holmes GE. The dependence of HNO2 mutagenesis in phage T4 on ligase and the lack of dependence of 2AP mutagenesis on repair functions. MOLECULAR & GENERAL GENETICS : MGG 1976; 148:213-20. [PMID: 979960 DOI: 10.1007/bf00268387] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A temperature sensitive ligase allele of phage T4 reduced or eliminated HNO2 induced reversion of am mutants. Since at the temperatures used, the ligase mutant is defective in the repair of some types of lethal lesions (i.e., UV, MMS and EMS induced lesions) these results indicate that HNO2 mutagenesis may occur through a ligase dependent repair pathway. In contrast, 2AP induced mutation was not inhibited by mutants defective in the gene 30 ligase or in genes 32, 39, 41, 42, 44, 45, 46, 47, 49, 52, 56, 58-61 and v. This indicates that 2AP mutagenesis probably does not depend on a repair pathway in phage T4.
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28
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Seto H, Lopez R, Garrigan O, Tomasz A. Nucleolytic degradation of homologous and heterologous deoxyribonucleic acid molecules at the surface of competent pneumococci. J Bacteriol 1975; 122:676-85. [PMID: 236283 PMCID: PMC246106 DOI: 10.1128/jb.122.2.676-685.1975] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Competent pneumococci can catalyze the rapid and quantitative degradation of extracellular deocyribonucleic acid (DNA) molecules through the activity of surface-located nucleases (endo- and, possibly, exonucleases as well). Both homologous and heterologous DNAs are degraded by a mechanism that seems to involve a cyclic process: (i) attachment of DNA to the cell surface followed by (ii) nucleolytic attack, and (iii) release to the medium. Processes (ii) and (iii) are both inhibited by ethylenediaminetetraacetate. Whereas surface nuclease activity is specific for competent cells, the bulk of this activity is not coupled to irreversible DNA uptake (deoxyribonuclease-resistant binding). Pneumococcal DNA treated with ultraviolet irradiation or nitrous acid (cross-linking?) is selectively impaired in the ability to irreversibly bind to competent cells, whereas reversible binding is normal.
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29
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30
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Burnotte J, Verly WG. Crosslinking of methylated DNA by moderate heating at neutral pH. BIOCHIMICA ET BIOPHYSICA ACTA 1972; 262:449-52. [PMID: 5019068 DOI: 10.1016/0005-2787(72)90488-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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31
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Burnotte J, Verly W. A Kinetic Approach to the Mechanism of Deoxyribonucleic Acid Cross-Linking by HNO2. J Biol Chem 1971. [DOI: 10.1016/s0021-9258(18)61813-7] [Citation(s) in RCA: 19] [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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