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1995
Keith G., Dirheimer G.
Postlabeling: a sensitive method for studying DNA adducts and their role in carcinogenesis Article de journal
Dans: Curr Opin Biotechnol, vol. 6, no. 1, p. 3-11, 1995, (0958-1669 Journal Article Review Review, Academic).
Résumé | BibTeX | Étiquettes: *Cell, *Genome, Adducts/*analysis, and, Animals, Base, Cell, Conditions/genetics/pathology, Data, Dilution, Division, DNA, Genetic, Gov't, Human, Models, Molecular, Mutagenesis, Neoplasms/*genetics/pathology, Neoplastic, Non-U.S., Phosphorus, Precancerous, Radioisotope, Radioisotopes, Sensitivity, Sequence, Specificity, Support, Technique, Transformation, Xenobiotics
@article{,
title = {Postlabeling: a sensitive method for studying DNA adducts and their role in carcinogenesis},
author = { G. Keith and G. Dirheimer},
year = {1995},
date = {1995-01-01},
journal = {Curr Opin Biotechnol},
volume = {6},
number = {1},
pages = {3-11},
abstract = {The covalent binding of xenobiotics to DNA is an important trigger of the multistage process that leads to carcinogenesis. 32P-postlabeling represents a highly sensitive method for biomonitoring exposure to genotoxic agents and for cancer risk assessment; it is capable of detecting less than one DNA adduct per human genome. Recent improvements to the technique have shown that the resistance of adducted DNA to enzyme digestion may lead to an overestimation of the number of different adducts present in a sample.},
note = {0958-1669
Journal Article
Review
Review, Academic},
keywords = {*Cell, *Genome, Adducts/*analysis, and, Animals, Base, Cell, Conditions/genetics/pathology, Data, Dilution, Division, DNA, Genetic, Gov't, Human, Models, Molecular, Mutagenesis, Neoplasms/*genetics/pathology, Neoplastic, Non-U.S., Phosphorus, Precancerous, Radioisotope, Radioisotopes, Sensitivity, Sequence, Specificity, Support, Technique, Transformation, Xenobiotics},
pubstate = {published},
tppubtype = {article}
}
The covalent binding of xenobiotics to DNA is an important trigger of the multistage process that leads to carcinogenesis. 32P-postlabeling represents a highly sensitive method for biomonitoring exposure to genotoxic agents and for cancer risk assessment; it is capable of detecting less than one DNA adduct per human genome. Recent improvements to the technique have shown that the resistance of adducted DNA to enzyme digestion may lead to an overestimation of the number of different adducts present in a sample.
1994
Meister Marie, Braun A, Kappler Christine, Reichhart Jean-Marc, Hoffmann Jules A
Insect immunity. A transgenic analysis in Drosophila defines several functional domains in the diptericin promoter Article de journal
Dans: EMBO J., vol. 13, no. 24, p. 5958–5966, 1994, ISSN: 0261-4189.
Résumé | BibTeX | Étiquettes: Animals, Anti-Infective Agents, Base Sequence, beta-Galactosidase, DNA Mutational Analysis, Female, Gene Expression Regulation, Genetic, Genetically Modified, Germ Cells, hoffmann, Insect Hormones, Insect Proteins, M3i, Male, Models, Nucleic Acid, Promoter Regions, Recombinant Fusion Proteins, reichhart, Repetitive Sequences, Transformation
@article{meister_insect_1994,
title = {Insect immunity. A transgenic analysis in Drosophila defines several functional domains in the diptericin promoter},
author = {Marie Meister and A Braun and Christine Kappler and Jean-Marc Reichhart and Jules A Hoffmann},
issn = {0261-4189},
year = {1994},
date = {1994-12-01},
journal = {EMBO J.},
volume = {13},
number = {24},
pages = {5958--5966},
abstract = {Diptericins are antibacterial polypeptides which are strongly induced in the fat body and blood cells of dipteran insects in response to septic injury. The promoter of the single-copy, intronless diptericin gene of Drosophila contains several nucleotide sequences homologous to mammalian cis-regulatory motifs involved in the control of acute phase response genes. Extending our previous studies on the expression of the diptericin gene, we now report a quantitative analysis of the contribution of various putative regulatory elements to the bacterial inducibility of this gene, based on the generation of 60 transgenic fly lines carrying different elements fused to a reporter gene. Our data definitively identify two Kappa B-related motifs in the proximal promoter as the sites conferring inducibility and tissue-specific expression to the diptericin gene. These motifs alone, however, mediate only minimal levels of expression. Additional proximal regulatory elements are necessary to attain some 20% of the full response and we suspect a role for sequences homologous to mammalian IL6 response elements and interferon-gamma responsive sites in this up-regulation. The transgenic experiments also reveal the existence of a distal regulatory element located upstream of -0.6 kb which increases the level of expression by a factor of five.},
keywords = {Animals, Anti-Infective Agents, Base Sequence, beta-Galactosidase, DNA Mutational Analysis, Female, Gene Expression Regulation, Genetic, Genetically Modified, Germ Cells, hoffmann, Insect Hormones, Insect Proteins, M3i, Male, Models, Nucleic Acid, Promoter Regions, Recombinant Fusion Proteins, reichhart, Repetitive Sequences, Transformation},
pubstate = {published},
tppubtype = {article}
}
Diptericins are antibacterial polypeptides which are strongly induced in the fat body and blood cells of dipteran insects in response to septic injury. The promoter of the single-copy, intronless diptericin gene of Drosophila contains several nucleotide sequences homologous to mammalian cis-regulatory motifs involved in the control of acute phase response genes. Extending our previous studies on the expression of the diptericin gene, we now report a quantitative analysis of the contribution of various putative regulatory elements to the bacterial inducibility of this gene, based on the generation of 60 transgenic fly lines carrying different elements fused to a reporter gene. Our data definitively identify two Kappa B-related motifs in the proximal promoter as the sites conferring inducibility and tissue-specific expression to the diptericin gene. These motifs alone, however, mediate only minimal levels of expression. Additional proximal regulatory elements are necessary to attain some 20% of the full response and we suspect a role for sequences homologous to mammalian IL6 response elements and interferon-gamma responsive sites in this up-regulation. The transgenic experiments also reveal the existence of a distal regulatory element located upstream of -0.6 kb which increases the level of expression by a factor of five.
Auble D T, Hansen K E, Mueller C G, Lane W S, Thorner J, Hahn S
Mot1, a global repressor of RNA polymerase II transcription, inhibits TBP binding to DNA by an ATP-dependent mechanism Article de journal
Dans: Genes & Development, vol. 8, no. 16, p. 1920–1934, 1994, ISSN: 0890-9369.
Résumé | Liens | BibTeX | Étiquettes: Adenosine Triphosphatases, Adenosine Triphosphate, Amino Acid Sequence, Base Sequence, Biological, DNA, DNA Helicases, DNA Probes, DNA-Binding Proteins, Fungal, Fungal Proteins, Genes, Genetic, Models, Molecular Sequence Data, Mutagenesis, Repressor Proteins, RNA Polymerase II, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Site-Directed, TATA Box, TATA-Binding Protein Associated Factors, TATA-Box Binding Protein, Team-Mueller, Transcription, Transcription Factors
@article{auble_mot1_1994,
title = {Mot1, a global repressor of RNA polymerase II transcription, inhibits TBP binding to DNA by an ATP-dependent mechanism},
author = {D T Auble and K E Hansen and C G Mueller and W S Lane and J Thorner and S Hahn},
doi = {10.1101/gad.8.16.1920},
issn = {0890-9369},
year = {1994},
date = {1994-08-01},
journal = {Genes & Development},
volume = {8},
number = {16},
pages = {1920--1934},
abstract = {Basal transcription of many genes in yeast is repressed by Mot1, an essential protein which is a member of the Snf2/Swi2 family of conserved nuclear factors. ADI is an ATP-dependent inhibitor of TATA-binding protein (TBP) binding to DNA that inhibits transcription in vitro. Here we demonstrate that ADI is encoded by the MOT1 gene. Mutation of MOT1 abolishes ADI activity and derepresses basal transcription in vitro and in vivo. Recombinant Mot1 removes TBP from DNA and Mot1 contains an ATPase activity which is essential for its function. Genetic interactions between Mot1 and TBP indicate that their functions are interlinked in vivo. These results provide a general model for understanding the mechanism of action of a large family of nuclear factors involved in processes such as transcription and DNA repair.},
keywords = {Adenosine Triphosphatases, Adenosine Triphosphate, Amino Acid Sequence, Base Sequence, Biological, DNA, DNA Helicases, DNA Probes, DNA-Binding Proteins, Fungal, Fungal Proteins, Genes, Genetic, Models, Molecular Sequence Data, Mutagenesis, Repressor Proteins, RNA Polymerase II, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Site-Directed, TATA Box, TATA-Binding Protein Associated Factors, TATA-Box Binding Protein, Team-Mueller, Transcription, Transcription Factors},
pubstate = {published},
tppubtype = {article}
}
Basal transcription of many genes in yeast is repressed by Mot1, an essential protein which is a member of the Snf2/Swi2 family of conserved nuclear factors. ADI is an ATP-dependent inhibitor of TATA-binding protein (TBP) binding to DNA that inhibits transcription in vitro. Here we demonstrate that ADI is encoded by the MOT1 gene. Mutation of MOT1 abolishes ADI activity and derepresses basal transcription in vitro and in vivo. Recombinant Mot1 removes TBP from DNA and Mot1 contains an ATPase activity which is essential for its function. Genetic interactions between Mot1 and TBP indicate that their functions are interlinked in vivo. These results provide a general model for understanding the mechanism of action of a large family of nuclear factors involved in processes such as transcription and DNA repair.
Dumas P., Bergdoll M., Cagnon C., Masson J. M.
Crystal structure and site-directed mutagenesis of a bleomycin resistance protein and their significance for drug sequestering Article de journal
Dans: EMBO J, vol. 13, no. 11, p. 2483-92, 1994, (0261-4189 Journal Article).
Résumé | BibTeX | Étiquettes: *Acetyltransferases, &, Acid, Amino, Bacterial, Bacterial/*genetics, Base, Binding, Bleomycin/*metabolism/pharmacology, Conformation, Crystallization, Crystallography, Data, Drug, Fusion, Genes, Gov't, Microbial/genetics, Models, Molecular, Mutagenesis, Non-U.S., Protein, Proteins/*chemistry/genetics/isolation, Proteins/isolation, purification, purification/metabolism, Recombinant, Relationship, Resistance, Secondary, Sequence, Site-Directed, Sites, Structural, structure, Structure-Activity, Support, X-Ray
@article{,
title = {Crystal structure and site-directed mutagenesis of a bleomycin resistance protein and their significance for drug sequestering},
author = { P. Dumas and M. Bergdoll and C. Cagnon and J. M. Masson},
year = {1994},
date = {1994-01-01},
journal = {EMBO J},
volume = {13},
number = {11},
pages = {2483-92},
abstract = {The antibiotic bleomycin, a strong DNA cutting agent, is naturally produced by actinomycetes which have developed a resistance mechanism against such a lethal compound. The crystal structure, at 2.3 A resolution, of a bleomycin resistance protein of 14 kDa reveals a structure in two halves with the same alpha/beta fold despite no sequence similarity. The crystal packing shows compact dimers with a hydrophobic interface and involved in mutual chain exchange. Two independent solution studies (analytical centrifugation and light scattering) showed that this dimeric form is not a packing artefact but is indeed the functional one. Furthermore, light scattering also showed that one dimer binds two antibiotic molecules as expected. A crevice located at the dimer interface, as well as the results of a site-directed mutagenesis study, led to a model wherein two bleomycin molecules are completely sequestered by one dimer. This provides a novel insight into antibiotic resistance due to drug sequestering, and probably also into drug transport and excretion.},
note = {0261-4189
Journal Article},
keywords = {*Acetyltransferases, &, Acid, Amino, Bacterial, Bacterial/*genetics, Base, Binding, Bleomycin/*metabolism/pharmacology, Conformation, Crystallization, Crystallography, Data, Drug, Fusion, Genes, Gov't, Microbial/genetics, Models, Molecular, Mutagenesis, Non-U.S., Protein, Proteins/*chemistry/genetics/isolation, Proteins/isolation, purification, purification/metabolism, Recombinant, Relationship, Resistance, Secondary, Sequence, Site-Directed, Sites, Structural, structure, Structure-Activity, Support, X-Ray},
pubstate = {published},
tppubtype = {article}
}
The antibiotic bleomycin, a strong DNA cutting agent, is naturally produced by actinomycetes which have developed a resistance mechanism against such a lethal compound. The crystal structure, at 2.3 A resolution, of a bleomycin resistance protein of 14 kDa reveals a structure in two halves with the same alpha/beta fold despite no sequence similarity. The crystal packing shows compact dimers with a hydrophobic interface and involved in mutual chain exchange. Two independent solution studies (analytical centrifugation and light scattering) showed that this dimeric form is not a packing artefact but is indeed the functional one. Furthermore, light scattering also showed that one dimer binds two antibiotic molecules as expected. A crevice located at the dimer interface, as well as the results of a site-directed mutagenesis study, led to a model wherein two bleomycin molecules are completely sequestered by one dimer. This provides a novel insight into antibiotic resistance due to drug sequestering, and probably also into drug transport and excretion.
1992
Bonmatin J M, Bonnat J L, Gallet X, Vovelle F, Ptak M, Reichhart Jean-Marc, Hoffmann Jules A, Keppi E, Legrain M, Achstetter T
Two-dimensional 1H NMR study of recombinant insect defensin A in water: resonance assignments, secondary structure and global folding Article de journal
Dans: J. Biomol. NMR, vol. 2, no. 3, p. 235–256, 1992, ISSN: 0925-2738.
Résumé | BibTeX | Étiquettes: Animals, Defensins, hoffmann, Hydrogen, Insect Hormones, insects, M3i, Magnetic Resonance Spectroscopy, Models, Molecular, Protein Conformation, Recombinant Proteins, reichhart, Saccharomyces cerevisiae, Thermodynamics
@article{bonmatin_two-dimensional_1992,
title = {Two-dimensional 1H NMR study of recombinant insect defensin A in water: resonance assignments, secondary structure and global folding},
author = {J M Bonmatin and J L Bonnat and X Gallet and F Vovelle and M Ptak and Jean-Marc Reichhart and Jules A Hoffmann and E Keppi and M Legrain and T Achstetter},
issn = {0925-2738},
year = {1992},
date = {1992-01-01},
journal = {J. Biomol. NMR},
volume = {2},
number = {3},
pages = {235--256},
abstract = {A 500 MHz 2D 1H NMR study of recombinant insect defensin A is reported. This defense protein of 40 residues contains 3 disulfide bridges, is positively charged and exhibits antibacterial properties. 2D NMR maps of recombinant defensin A were fully assigned and secondary structure elements were localized. The set of NOE connectivities, 3JNH-alpha H coupling constants as well as 1H/2H exchange rates and delta delta/delta T temperature coefficients of NH protons strongly support the existence of an alpha-helix (residues 14-24) and of an antiparallel beta-sheet (residues 27-40). Models of the backbone folding were generated by using the DISMAN program and energy refined by using the AMBER program. This was done on the basis of: (i) 133 selected NOEs, (ii) 21 dihedral restraints from 3JNH-alpha H coupling constants, (iii) 12 hydrogen bonds mostly deduced from 1H/2H exchange rates or temperature coefficients, in addition to 9 initial disulfide bridge covalent constraints. The two secondary structure elements and the two bends connecting them involve approximately 70% of the total number of residues, which impose some stability in the C-terminal part of the molecule. The remaining N-terminal fragment forms a less well defined loop. This spatial organization, in which a beta-sheet is linked to an alpha-helix by two disulfide bridges and to a large loop by a third disulfide bridge, is rather similar to that found in scorpion charybdotoxin and seems to be partly present in several invertebrate toxins.},
keywords = {Animals, Defensins, hoffmann, Hydrogen, Insect Hormones, insects, M3i, Magnetic Resonance Spectroscopy, Models, Molecular, Protein Conformation, Recombinant Proteins, reichhart, Saccharomyces cerevisiae, Thermodynamics},
pubstate = {published},
tppubtype = {article}
}
A 500 MHz 2D 1H NMR study of recombinant insect defensin A is reported. This defense protein of 40 residues contains 3 disulfide bridges, is positively charged and exhibits antibacterial properties. 2D NMR maps of recombinant defensin A were fully assigned and secondary structure elements were localized. The set of NOE connectivities, 3JNH-alpha H coupling constants as well as 1H/2H exchange rates and delta delta/delta T temperature coefficients of NH protons strongly support the existence of an alpha-helix (residues 14-24) and of an antiparallel beta-sheet (residues 27-40). Models of the backbone folding were generated by using the DISMAN program and energy refined by using the AMBER program. This was done on the basis of: (i) 133 selected NOEs, (ii) 21 dihedral restraints from 3JNH-alpha H coupling constants, (iii) 12 hydrogen bonds mostly deduced from 1H/2H exchange rates or temperature coefficients, in addition to 9 initial disulfide bridge covalent constraints. The two secondary structure elements and the two bends connecting them involve approximately 70% of the total number of residues, which impose some stability in the C-terminal part of the molecule. The remaining N-terminal fragment forms a less well defined loop. This spatial organization, in which a beta-sheet is linked to an alpha-helix by two disulfide bridges and to a large loop by a third disulfide bridge, is rather similar to that found in scorpion charybdotoxin and seems to be partly present in several invertebrate toxins.
1988
Kappler Christine, Kabbouh M, Hetru Charles, Durst F, Hoffmann Jules A
Characterization of three hydroxylases involved in the final steps of biosynthesis of the steroid hormone ecdysone in Locusta migratoria (Insecta, Orthoptera) Article de journal
Dans: J. Steroid Biochem., vol. 31, no. 6, p. 891–898, 1988, ISSN: 0022-4731.
Résumé | BibTeX | Étiquettes: Animals, Biological, Ecdysone, Grasshoppers, hoffmann, Kinetics, M3i, Mixed Function Oxygenases, Models, NAD, NADP, Subcellular Fractions
@article{kappler_characterization_1988,
title = {Characterization of three hydroxylases involved in the final steps of biosynthesis of the steroid hormone ecdysone in Locusta migratoria (Insecta, Orthoptera)},
author = {Christine Kappler and M Kabbouh and Charles Hetru and F Durst and Jules A Hoffmann},
issn = {0022-4731},
year = {1988},
date = {1988-12-01},
journal = {J. Steroid Biochem.},
volume = {31},
number = {6},
pages = {891--898},
abstract = {It is most generally accepted that the last three enzymatic reactions in the biosynthetic pathway of ecdysone are, in this order, the hydroxylations at positions C-25, C-22 and C-2. Using high specific activity tritiated ecdysone precursors (2,22,25-trideoxyecdysone, 2,22-dideoxyecdysone and 2-deoxyecdysone) we have characterized the hydroxylases involved in these reactions, in the major biosynthetic tissue of ecdysone, i.e. the prothoracic glands. We show that C-2 hydroxylase is a mitochondrial oxygenase which differs from conventional cytochrome P-450-dependent monooxygenases by its relative insensitivity to CO. In contrast, C-22 and C-25 hydroxylases appear as classical cytochrome P-450 monooxygenases; C-22 hydroxylase is a mitochondrial enzyme whereas our data point to a microsomal localization of the C-25 hydroxylase.},
keywords = {Animals, Biological, Ecdysone, Grasshoppers, hoffmann, Kinetics, M3i, Mixed Function Oxygenases, Models, NAD, NADP, Subcellular Fractions},
pubstate = {published},
tppubtype = {article}
}
It is most generally accepted that the last three enzymatic reactions in the biosynthetic pathway of ecdysone are, in this order, the hydroxylations at positions C-25, C-22 and C-2. Using high specific activity tritiated ecdysone precursors (2,22,25-trideoxyecdysone, 2,22-dideoxyecdysone and 2-deoxyecdysone) we have characterized the hydroxylases involved in these reactions, in the major biosynthetic tissue of ecdysone, i.e. the prothoracic glands. We show that C-2 hydroxylase is a mitochondrial oxygenase which differs from conventional cytochrome P-450-dependent monooxygenases by its relative insensitivity to CO. In contrast, C-22 and C-25 hydroxylases appear as classical cytochrome P-450 monooxygenases; C-22 hydroxylase is a mitochondrial enzyme whereas our data point to a microsomal localization of the C-25 hydroxylase.
