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1994
Marquet R, Paillart J C, Skripkin E, Ehresmann C, Ehresmann B
Dimerization of human immunodeficiency virus type 1 RNA involves sequences located upstream of the splice donor site Article de journal
Dans: Nucleic Acids Res, vol. 22, no. 2, p. 145-151, 1994, ISBN: 8121797, (0305-1048 Journal Article).
Résumé | Liens | BibTeX | Étiquettes: Base Sequence Cations HIV-1/*genetics Kinetics Macromolecular Systems Magnesium Models, Chemical Models, Genetic Molecular Sequence Data RNA Splicing RNA, MARQUET, Non-U.S. Gov't Thermodynamics, PAILLART, Unité ARN, Viral/*chemistry Support
@article{,
title = {Dimerization of human immunodeficiency virus type 1 RNA involves sequences located upstream of the splice donor site},
author = {R Marquet and J C Paillart and E Skripkin and C Ehresmann and B Ehresmann},
url = {http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=8121797},
isbn = {8121797},
year = {1994},
date = {1994-01-01},
journal = {Nucleic Acids Res},
volume = {22},
number = {2},
pages = {145-151},
abstract = {The retroviral genome consists of two homologous RNA molecules associated close to their 5' ends. We studied the spontaneous dimerization of four HIV-1 RNA fragments (RNAs 1-707, 1-615, 311-612, and 311-415) containing the previously defined dimerization domain, and a RNA fragment (RNA 1-311) corresponding to the upstream sequences. Significant dimerization of all RNAs is observed on agarose gels when magnesium is included in the electrophoresis buffer. In contrast to dimerization of RNAs 311-612 and 311-415, dimerization of RNAs 1-707, 1-615 and 1-311 strongly depends on the size of the monovalent cation present in the incubation buffer. Also, dimerization of RNAs 1-707, 1-615, and 1-311 is 10 times faster than that of RNAs 311-612 and 311-415. The dimers formed by the latter RNAs are substantially more stable than that of RNA 1-615, while RNA 1-311 dimer is 5-7 degrees C less stable than RNA 1-615 dimer. These results indicate that dimerization of HIV-1 genomic RNA involves elements located upstream of the splice donor site (position 305), i.e. outside of the previously defined dimerization domain.},
note = {0305-1048
Journal Article},
keywords = {Base Sequence Cations HIV-1/*genetics Kinetics Macromolecular Systems Magnesium Models, Chemical Models, Genetic Molecular Sequence Data RNA Splicing RNA, MARQUET, Non-U.S. Gov't Thermodynamics, PAILLART, Unité ARN, Viral/*chemistry Support},
pubstate = {published},
tppubtype = {article}
}
The retroviral genome consists of two homologous RNA molecules associated close to their 5' ends. We studied the spontaneous dimerization of four HIV-1 RNA fragments (RNAs 1-707, 1-615, 311-612, and 311-415) containing the previously defined dimerization domain, and a RNA fragment (RNA 1-311) corresponding to the upstream sequences. Significant dimerization of all RNAs is observed on agarose gels when magnesium is included in the electrophoresis buffer. In contrast to dimerization of RNAs 311-612 and 311-415, dimerization of RNAs 1-707, 1-615 and 1-311 strongly depends on the size of the monovalent cation present in the incubation buffer. Also, dimerization of RNAs 1-707, 1-615, and 1-311 is 10 times faster than that of RNAs 311-612 and 311-415. The dimers formed by the latter RNAs are substantially more stable than that of RNA 1-615, while RNA 1-311 dimer is 5-7 degrees C less stable than RNA 1-615 dimer. These results indicate that dimerization of HIV-1 genomic RNA involves elements located upstream of the splice donor site (position 305), i.e. outside of the previously defined dimerization domain.
1993
Marquet R, Ehresmann C, Ehresmann B
Higher Order Structures of HIV-1 RNA as Sites for Drug Actions. Chapitre d'ouvrage
Dans: Crooke, S T; Lebleu, B (Ed.): Antisense Research and Applications, p. 401-414, CRC Press, 1993.
Liens | BibTeX | Étiquettes: MARQUET, Unité ARN
@inbook{,
title = {Higher Order Structures of HIV-1 RNA as Sites for Drug Actions.},
author = {R Marquet and C Ehresmann and B Ehresmann},
editor = {S T Crooke and B Lebleu},
url = {http://www.crcpress.com/product/isbn/9780849347054},
year = {1993},
date = {1993-01-01},
booktitle = {Antisense Research and Applications},
pages = {401-414},
publisher = {CRC Press},
keywords = {MARQUET, Unité ARN},
pubstate = {published},
tppubtype = {inbook}
}
Isel C, Marquet R, Keith G, Ehresmann C, Ehresmann B
Modified nucleotides of tRNA(3Lys) modulate primer/template loop-loop interaction in the initiation complex of HIV-1 reverse transcription Article de journal
Dans: J Biol Chem, vol. 268, no. 34, p. 25269-25272, 1993, ISBN: 7503978, (0021-9258 Journal Article).
Résumé | Liens | BibTeX | Étiquettes: Anticodon/genetics/metabolism Base Sequence Binding Sites Comparative Study DNA Primers HIV-1/genetics/*metabolism HIV-1 Reverse Transcriptase HIV-2/genetics/metabolism Molecular Sequence Data Nucleic Acid Conformation RNA, Genetic, Genetic *Transcription, Lys/*metabolism RNA, MARQUET, Non-U.S. Gov't Templates, Transfer, Unité ARN, Viral/*biosynthesis RNA-Directed DNA Polymerase/*metabolism SIV/genetics/metabolism Support
@article{,
title = {Modified nucleotides of tRNA(3Lys) modulate primer/template loop-loop interaction in the initiation complex of HIV-1 reverse transcription},
author = {C Isel and R Marquet and G Keith and C Ehresmann and B Ehresmann},
url = {http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=7503978},
isbn = {7503978},
year = {1993},
date = {1993-01-01},
journal = {J Biol Chem},
volume = {268},
number = {34},
pages = {25269-25272},
abstract = {In all retroviruses, reverse transcription is primed by a tRNA whose 3' end 18 nucleotides are complementary to the so called viral primer binding site. Previous work showed that reverse transcription of HIV-1 RNA is initiated by tRNA(3Lys). Using a variety of chemical and enzymatic structural probes, we investigated the interactions between HIV-1 RNA and its natural primer tRNA(3Lys). In addition to the predictable contacts between the viral primer binding site and the 3' end of tRNA(3Lys), a specific interaction takes place between an A-rich loop located upstream of the primer binding site region and the anticodon loop of tRNA(3Lys). This AAAA/Umcm5s2UUU loop-loop interaction is not observed when the natural primer is replaced by an in vitro synthesized tRNA(3Lys) transcript. Furthermore, dethiolation of the modified nucleotide mcm5s2U at position 34 of tRNA(3Lys) strongly destabilizes this interaction. Sequence and structure comparisons indicate that the primer/template loop-loop interaction is conserved in all HIV-1 isolates, and possibly also in HIV-2 and SIV.},
note = {0021-9258
Journal Article},
keywords = {Anticodon/genetics/metabolism Base Sequence Binding Sites Comparative Study DNA Primers HIV-1/genetics/*metabolism HIV-1 Reverse Transcriptase HIV-2/genetics/metabolism Molecular Sequence Data Nucleic Acid Conformation RNA, Genetic, Genetic *Transcription, Lys/*metabolism RNA, MARQUET, Non-U.S. Gov't Templates, Transfer, Unité ARN, Viral/*biosynthesis RNA-Directed DNA Polymerase/*metabolism SIV/genetics/metabolism Support},
pubstate = {published},
tppubtype = {article}
}
In all retroviruses, reverse transcription is primed by a tRNA whose 3' end 18 nucleotides are complementary to the so called viral primer binding site. Previous work showed that reverse transcription of HIV-1 RNA is initiated by tRNA(3Lys). Using a variety of chemical and enzymatic structural probes, we investigated the interactions between HIV-1 RNA and its natural primer tRNA(3Lys). In addition to the predictable contacts between the viral primer binding site and the 3' end of tRNA(3Lys), a specific interaction takes place between an A-rich loop located upstream of the primer binding site region and the anticodon loop of tRNA(3Lys). This AAAA/Umcm5s2UUU loop-loop interaction is not observed when the natural primer is replaced by an in vitro synthesized tRNA(3Lys) transcript. Furthermore, dethiolation of the modified nucleotide mcm5s2U at position 34 of tRNA(3Lys) strongly destabilizes this interaction. Sequence and structure comparisons indicate that the primer/template loop-loop interaction is conserved in all HIV-1 isolates, and possibly also in HIV-2 and SIV.
Baudin F, Marquet R, Isel C, Darlix J L, Ehresmann B, Ehresmann C
Functional sites in the 5' region of human immunodeficiency virus type 1 RNA form defined structural domains Article de journal
Dans: J Mol Biol, vol. 229, no. 2, p. 382-397, 1993, ISBN: 8429553, (0022-2836 Journal Article).
Résumé | Liens | BibTeX | Étiquettes: Animals Base Sequence Electrophoresis, Genetic, MARQUET, Non-U.S. Gov't Translation, Polyacrylamide Gel HIV-1/*genetics Molecular Sequence Data Nucleic Acid Conformation RNA, Unité ARN, Viral/*chemistry/metabolism Rabbits Support
@article{,
title = {Functional sites in the 5' region of human immunodeficiency virus type 1 RNA form defined structural domains},
author = {F Baudin and R Marquet and C Isel and J L Darlix and B Ehresmann and C Ehresmann},
url = {http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=8429553},
isbn = {8429553},
year = {1993},
date = {1993-01-01},
journal = {J Mol Biol},
volume = {229},
number = {2},
pages = {382-397},
abstract = {The 5' region of HIV-1 RNA contains functional elements involved in key steps of the retroviral cycle, such as genomic RNA transcription, splicing, translation, dimerization or initiation of reverse transcription. In the present work, we investigated the conformation of the first 500 nucleotides covering the RNA leader and the 5' gag coding sequences of HIV-MAL, using chemical probing. We provide detailed information on almost each nucleotide at one of their Watson-Crick positions and on position N-7 of purines. Experiments were conducted on two in vitro transcribed RNA fragments (1 to 707 and 1 to 311). A secondary structure model was derived by combining the experimental data, computer predictions and sequence comparison. Under conditions favoring dimerization (high salt concentration), HIV-1 RNA folds into independent structural domains that can be related to defined functional regions. The first domain corresponds to TAR forming a stable stem-loop. Intrinsic structural features are found to stabilize the TAR hairpin loop. The second domain (nucleotides 56 to 299) contains the PBS sequence, which is located in a stable subdomain constrained by a four stem junction (nucleotides 139 to 218). Although the MAL isolate has an insertion near the PBS, probably resulting from the duplication of a 23-nucleotide sequence, the structural organization of this subdomain is conserved in all other HIV-1 isolates. The third domain (nucleotides 300 to 404) contains the splice donor site, packaging and dimerization elements and the AUG initiation codon of gag. A major result is the structural versatility of this region. Two mutually exclusive structures, both equally in agreement with probing data, could modulate the different functions involving this domain. The reduced accessibility of the gag translational initiation site possibly accounts for the low efficiency of the in vitro translation of the dimer. Finally, the 5' gag coding sequences form a metastable domain.},
note = {0022-2836
Journal Article},
keywords = {Animals Base Sequence Electrophoresis, Genetic, MARQUET, Non-U.S. Gov't Translation, Polyacrylamide Gel HIV-1/*genetics Molecular Sequence Data Nucleic Acid Conformation RNA, Unité ARN, Viral/*chemistry/metabolism Rabbits Support},
pubstate = {published},
tppubtype = {article}
}
The 5' region of HIV-1 RNA contains functional elements involved in key steps of the retroviral cycle, such as genomic RNA transcription, splicing, translation, dimerization or initiation of reverse transcription. In the present work, we investigated the conformation of the first 500 nucleotides covering the RNA leader and the 5' gag coding sequences of HIV-MAL, using chemical probing. We provide detailed information on almost each nucleotide at one of their Watson-Crick positions and on position N-7 of purines. Experiments were conducted on two in vitro transcribed RNA fragments (1 to 707 and 1 to 311). A secondary structure model was derived by combining the experimental data, computer predictions and sequence comparison. Under conditions favoring dimerization (high salt concentration), HIV-1 RNA folds into independent structural domains that can be related to defined functional regions. The first domain corresponds to TAR forming a stable stem-loop. Intrinsic structural features are found to stabilize the TAR hairpin loop. The second domain (nucleotides 56 to 299) contains the PBS sequence, which is located in a stable subdomain constrained by a four stem junction (nucleotides 139 to 218). Although the MAL isolate has an insertion near the PBS, probably resulting from the duplication of a 23-nucleotide sequence, the structural organization of this subdomain is conserved in all other HIV-1 isolates. The third domain (nucleotides 300 to 404) contains the splice donor site, packaging and dimerization elements and the AUG initiation codon of gag. A major result is the structural versatility of this region. Two mutually exclusive structures, both equally in agreement with probing data, could modulate the different functions involving this domain. The reduced accessibility of the gag translational initiation site possibly accounts for the low efficiency of the in vitro translation of the dimer. Finally, the 5' gag coding sequences form a metastable domain.
1992
Tounekti N, Mougel M, Roy C, Marquet R, Darlix J L, Paoletti J, Ehresmann B, Ehresmann C
Effect of dimerization on the conformation of the encapsidation Psi domain of Moloney murine leukemia virus RNA Article de journal
Dans: J Mol Biol, vol. 223, no. 1, p. 205-220, 1992, ISBN: 1731069, (0022-2836 Journal Article).
Résumé | Liens | BibTeX | Étiquettes: Base Sequence Comparative Study Hydrogen Bonding Macromolecular Systems Molecular Sequence Data Molecular Structure Moloney murine leukemia virus/*ultrastructure Nucleic Acid Conformation Phylogeny RNA, MARQUET, Non-U.S. Gov't, Unité ARN, Viral/chemistry/*ultrastructure Sequence Alignment Support
@article{,
title = {Effect of dimerization on the conformation of the encapsidation Psi domain of Moloney murine leukemia virus RNA},
author = {N Tounekti and M Mougel and C Roy and R Marquet and J L Darlix and J Paoletti and B Ehresmann and C Ehresmann},
url = {http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=1731069},
isbn = {1731069},
year = {1992},
date = {1992-01-01},
journal = {J Mol Biol},
volume = {223},
number = {1},
pages = {205-220},
abstract = {In Moloney murine leukemia virus, the encapsidation Psi element was shown to be necessary and sufficient to promote packaging of viral RNA, and to be required for dimerization. The conformation of the Psi domain (nucleotides 215 to 565) was investigated in solution by chemical probing. The four bases were monitored at one of their Watson-Crick positions with dimethylsulfate at cytosine N3 and adenosine N1, and with a carbodiimide derivative at guanosine N1 and uridine N3. Position N7 of adenine residues was probed with diethylpyrocarbonate. The analyses were conducted on in vitro transcribed fragments corresponding either to the isolated Psi domain or to the 5'-terminal 725 nucleotides. The RNA fragments were analyzed in their monomeric and dimeric forms. A secondary structure model was derived from probing data, computer prediction and sequence analysis of related murine retroviruses. One major result is that Psi forms an independent and highly structured domain. Dimerization induces an extensive reduction of reactivity in region 278 to 309 that can be interpreted as the result of intermolecular interactions and/or intramolecular conformational rearrangements. A second region (around position 215) was shown to display discrete reactivity changes upon dimerization. These two regions represent likely elements of dimerization. More unexpectedly, reactivity changes (essentially enhancement of reactivity) were also detected in another part of Psi (around position 480) not believed to contain elements of dimerization. These reactivity changes could be interpreted as dimerization-induced allosteric transitions.},
note = {0022-2836
Journal Article},
keywords = {Base Sequence Comparative Study Hydrogen Bonding Macromolecular Systems Molecular Sequence Data Molecular Structure Moloney murine leukemia virus/*ultrastructure Nucleic Acid Conformation Phylogeny RNA, MARQUET, Non-U.S. Gov't, Unité ARN, Viral/chemistry/*ultrastructure Sequence Alignment Support},
pubstate = {published},
tppubtype = {article}
}
In Moloney murine leukemia virus, the encapsidation Psi element was shown to be necessary and sufficient to promote packaging of viral RNA, and to be required for dimerization. The conformation of the Psi domain (nucleotides 215 to 565) was investigated in solution by chemical probing. The four bases were monitored at one of their Watson-Crick positions with dimethylsulfate at cytosine N3 and adenosine N1, and with a carbodiimide derivative at guanosine N1 and uridine N3. Position N7 of adenine residues was probed with diethylpyrocarbonate. The analyses were conducted on in vitro transcribed fragments corresponding either to the isolated Psi domain or to the 5'-terminal 725 nucleotides. The RNA fragments were analyzed in their monomeric and dimeric forms. A secondary structure model was derived from probing data, computer prediction and sequence analysis of related murine retroviruses. One major result is that Psi forms an independent and highly structured domain. Dimerization induces an extensive reduction of reactivity in region 278 to 309 that can be interpreted as the result of intermolecular interactions and/or intramolecular conformational rearrangements. A second region (around position 215) was shown to display discrete reactivity changes upon dimerization. These two regions represent likely elements of dimerization. More unexpectedly, reactivity changes (essentially enhancement of reactivity) were also detected in another part of Psi (around position 480) not believed to contain elements of dimerization. These reactivity changes could be interpreted as dimerization-induced allosteric transitions.
Rippe K, Fritsch V, Westhof E, Jovin T M
Alternating d(G-A) sequences form a parallel-stranded DNA homoduplex Article de journal
Dans: EMBO J, vol. 11, no. 10, p. 3777-3786, 1992, ISBN: 1396571, (0261-4189 Journal Article).
Résumé | Liens | BibTeX | Étiquettes: Base Sequence Circular Dichroism DNA/*chemistry Hydrogen Bonding Hydrogen-Ion Concentration Indicators and Reagents Magnesium Chloride Models, Fluorescence Spectrophotometry, MARQUET, Molecular Molecular Sequence Data *Nucleic Acid Conformation Oligodeoxyribonucleotides/*chemistry Spectrometry, PAILLART, Ultraviolet Structure-Activity Relationship Thermodynamics, Unité ARN, WESTHOF
@article{,
title = {Alternating d(G-A) sequences form a parallel-stranded DNA homoduplex},
author = {K Rippe and V Fritsch and E Westhof and T M Jovin},
url = {http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&dopt=Citation&list_uids=1396571},
isbn = {1396571},
year = {1992},
date = {1992-01-01},
journal = {EMBO J},
volume = {11},
number = {10},
pages = {3777-3786},
abstract = {The oligonucleotides d[(G-A)7G] and d[(G-A)12G] self-associate under physiological conditions (10 mM MgCl2, neutral pH) into a stable double-helical structure (psRR-DNA) in which the two polypurine strands are in a parallel orientation in contrast to the antiparallel disposition of conventional B-DNA. We have characterized psRR-DNA by gel electrophoresis, UV absorption, vacuum UV circular dichroism, monomer-excimer fluorescence of oligonucleotides end-labelled with pyrene, and chemical probing with diethyl pyrocarbonate and dimethyl sulfate. The duplex is stable at pH 4-9, suggesting that the structure is compatible with, but does not require, protonation of the A residues. The data support a model derived from force-field analysis in which the parallel-stranded d(G-A)n helix is right-handed and constituted of alternating, symmetrical Gsyn.Gsyn and Aanti.Aanti base pairs with N1H.O6 and N6H.N7 hydrogen bonds, respectively. This dinucleotide structure may be the source of a negative peak observed at 190 nm in the vacuum UV CD spectrum, a feature previously reported only for left-handed Z-DNA. The related sequence d[(GAAGGA)4G] also forms a parallel-stranded duplex but one that is less stable and probably involves a slightly different secondary structure. We discuss the potential intervention of psRR-DNA in recombination, gene expression and the stabilization of genomic structure.},
note = {0261-4189
Journal Article},
keywords = {Base Sequence Circular Dichroism DNA/*chemistry Hydrogen Bonding Hydrogen-Ion Concentration Indicators and Reagents Magnesium Chloride Models, Fluorescence Spectrophotometry, MARQUET, Molecular Molecular Sequence Data *Nucleic Acid Conformation Oligodeoxyribonucleotides/*chemistry Spectrometry, PAILLART, Ultraviolet Structure-Activity Relationship Thermodynamics, Unité ARN, WESTHOF},
pubstate = {published},
tppubtype = {article}
}
The oligonucleotides d[(G-A)7G] and d[(G-A)12G] self-associate under physiological conditions (10 mM MgCl2, neutral pH) into a stable double-helical structure (psRR-DNA) in which the two polypurine strands are in a parallel orientation in contrast to the antiparallel disposition of conventional B-DNA. We have characterized psRR-DNA by gel electrophoresis, UV absorption, vacuum UV circular dichroism, monomer-excimer fluorescence of oligonucleotides end-labelled with pyrene, and chemical probing with diethyl pyrocarbonate and dimethyl sulfate. The duplex is stable at pH 4-9, suggesting that the structure is compatible with, but does not require, protonation of the A residues. The data support a model derived from force-field analysis in which the parallel-stranded d(G-A)n helix is right-handed and constituted of alternating, symmetrical Gsyn.Gsyn and Aanti.Aanti base pairs with N1H.O6 and N6H.N7 hydrogen bonds, respectively. This dinucleotide structure may be the source of a negative peak observed at 190 nm in the vacuum UV CD spectrum, a feature previously reported only for left-handed Z-DNA. The related sequence d[(GAAGGA)4G] also forms a parallel-stranded duplex but one that is less stable and probably involves a slightly different secondary structure. We discuss the potential intervention of psRR-DNA in recombination, gene expression and the stabilization of genomic structure.
